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1

Optical Fibers Optics and Photonics  

E-Print Network (OSTI)

Optical Fibers Optics and Photonics Dr. Palffy-Muhoray Ines Busuladzic Department of Theoretical and Applied Mathematics The University of Akron April 21, 2008 #12;Outline · History of optical fibers · What are optical fibers? · How are optical fibers made? · Light propagation through optical fibers · Application

Palffy-Muhoray, Peter

2

The College of Optics & Photonics The College of Optics and Photonics  

E-Print Network (OSTI)

CREOL The College of Optics & Photonics The College of Optics and Photonics #12;CREOL The College of Optics & Photonics CREOLThe College of Optics and Photonics Industrial Affiliates Day 2010 #12;CREOL The College of Optics & Photonics Prof. William T. Rhodes Department of Comp & Elect Engrng & Comp Science

Van Stryland, Eric

3

University of Central Florida College of Optics & Photonics Optics  

E-Print Network (OSTI)

University of Central Florida College of Optics & Photonics Optics Spring 2010 OSE-6432: Principles of guided wave optics; electro -optics, acousto-optics and optoelectronics. Location: CREOL-A-214 or by Appointment Reference Materials: 1. Class Notes. 2. "Fundamentals of Optical Waveguides", K. Okamoto, Academic

Van Stryland, Eric

4

Electro-Optic Modulation of Single Photons  

E-Print Network (OSTI)

We use the Stokes photon of a biphoton pair to set the time origin for electro-optic modulation of the wave function of the anti-Stokes photon thereby allowing arbitrary phase and amplitude modulation. We demonstrate conditional single-photon wave functions composed of several pulses, or instead, having gaussian or exponential shapes.

Pavel Kolchin; Chinmay Belthangady; Shengwang Du; G. Y. Yin; S. E. Harris

2008-08-02T23:59:59.000Z

5

The College of Optics & Photonics Industrial Affiliates Day  

E-Print Network (OSTI)

CREOL The College of Optics & Photonics Industrial Affiliates Day 2011 Symposium on FAR IR & THZ Photonics CREOLThe College of Optics and Photonics #12;CREOL The College of Optics & Photonics Studentofthe characterization Dimitrios Mandridis Graduate Student CREOL,TheCollegeofOptics Photonics 2:05Walktothe

Van Stryland, Eric

6

The College of Optics & Photonics 1 Industrial Affiliates Day  

E-Print Network (OSTI)

3/7/14 1 CREOL The College of Optics & Photonics 1 Industrial Affiliates Day 2014 Symposium Advances in Optics & Photonics CREOLThe College of Optics and Photonics CREOL The College of Optics & Photonics 2 MJ Soileau V.P. for Research & Commercialization Professor of Optics, ECE & Physics Founder

Van Stryland, Eric

7

Optical Precursor of a Single Photon  

SciTech Connect

We report the direct observation of optical precursors of heralded single photons with step- and square-modulated wave packets passing through cold atoms. Using electromagnetically induced transparency and the slow-light effect, we separate the single-photon precursor, which always travels at the speed of light in vacuum, from its delayed main wave packet. In the two-level superluminal medium, our result suggests that the causality holds for a single photon.

Zhang Shanchao; Chen, J. F.; Liu, Chang; Loy, M. M. T.; Wong, G. K. L.; Du, Shengwang [Department of Physics, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon (Hong Kong)

2011-06-17T23:59:59.000Z

8

Optical receiver techniques for integrated photonic links  

E-Print Network (OSTI)

Integrated photonics has emerged as an I/O technology set to disrupt the communication fabric of many-core computer systems. The optical technology uses wavelength-division-multiplexing and a high degree of integration in ...

Georgas, Michael S. (Michael Stephen)

2014-01-01T23:59:59.000Z

9

Education and training in optics and photonics in Brazil  

Science Journals Connector (OSTI)

An overview of educational, training , and research activities as well as the capacity building of Brazilian institutions in the Optics and Photonics area is presented. Data collected...

de Arajo, Cid B

10

Use of a photonic crystal for optical amplifier gain control  

DOE Patents (OSTI)

An optical amplifier having a uniform gain profile uses a photonic crystal to tune the density-of-states of a gain medium so as to modify the light emission rate between atomic states. The density-of-states of the gain medium is tuned by selecting the size, shape, dielectric constant, and spacing of a plurality of microcavity defects in the photonic crystal. The optical amplifier is particularly useful for the regeneration of DWDM signals in long optical fibers.

Lin, Shawn-Yu (Albuquerque, NM); Fleming, James G. (Albuquerque, NM); El-Kady, Ihab (Albuquerque, NM)

2006-07-18T23:59:59.000Z

11

CREOL, The College of Optics and Photonics Industrial Affiliates Day April 9, 2010  

E-Print Network (OSTI)

CREOL, The College of Optics and Photonics Industrial Affiliates Day ­ April 9, 2010 "Optics, The College of Optics and Photonics ­Overview Bahaa Saleh Dean & Director, CREOL, The College of Optics and Photonics 9:25 "Fundamental Limits for Optical Devices" David Miller Director, Solid State and Photonics Lab

Van Stryland, Eric

12

Spring 2012 LC Optics and Photonics: CPHY-64495/74495  

E-Print Network (OSTI)

Spring 2012 LC Optics and Photonics: CPHY-64495/74495 Lecture times: M, W, F 9:55 ­ 10:50 Room: Cunningham Hall 00011 also LCI 108 (teaching lab) Text: class notes Guenther, Modern Optics (recommended) Electronic Resources: http://mpalffy.lci.kent.edu/optics Instructor: Peter Palffy-Muhoray LCM Rm. 201C 672

Palffy-Muhoray, Peter

13

Spring 2014 LC Optics and Photonics: CPHY-64495/74495  

E-Print Network (OSTI)

Spring 2014 LC Optics and Photonics: CPHY-64495/74495 Lecture times: T,Th,F 11:00 ­ 12:15 Room: LCI 107C also LCI 108 (teaching lab) Text: class notes Guenther, Modern Optics (recommended) Electronic Resources: http://mpalffy.lci.kent.edu/optics Instructor: Peter Palffy-Muhoray LCM Rm. 201C 672-2604 mpalffy

Palffy-Muhoray, Peter

14

Liquid Crystal Optics and Photonics CPHY Assignment 2.  

E-Print Network (OSTI)

Liquid Crystal Optics and Photonics CPHY 74495 Assignment 2. P. Pal¤y-Muhoray Jan. 24, 2014 Due: Feb 4, 2014 1. Read pages 25 - 37 of the text (Guenther, Modern Optics). 2. Read Ch 2., Review of Electricity and Magnetism (http://mpal¤y.lci.kent.edu/optics) 3. Red light with wavelength = 632:8nm

Palffy-Muhoray, Peter

15

Optical bistability with a repulsive optical force in coupled silicon photonic crystal membranes  

E-Print Network (OSTI)

We demonstrate actuation of a silicon photonic crystal membrane with a repulsive optical gradient force. The extent of the static actuation is extracted by examining the optical bistability as a combination of the ...

Hui, Pui-Chuen

2013-01-01T23:59:59.000Z

16

Magneto-optical oxide thin films and integrated nonreciprocal photonic devices  

E-Print Network (OSTI)

Nonreciprocal photonic devices including optical isolators and optical circulators are indispensible components in present day optical communication systems. Although highly desired by the fast development of silicon ...

Bi, Lei, Ph.D. Massachusetts Institute of Technology

2011-01-01T23:59:59.000Z

17

Optical diode based on the chirality of guided photons  

E-Print Network (OSTI)

Photons are nonchiral particles: their handedness can be both left and right. However, when light is transversely confined, it can locally exhibit a transverse spin whose orientation is fixed by the propagation direction of the photons. Confined photons thus have chiral character. Here, we employ this to demonstrate nonreciprocal transmission of light at the single-photon level through a silica nanofibre in two experimental schemes. We either use an ensemble of spin-polarised atoms that is weakly coupled to the nanofibre-guided mode or a single spin-polarised atom strongly coupled to the nanofibre via a whispering-gallery-mode resonator. We simultaneously achieve high optical isolation and high forward transmission. Both are controlled by the internal atomic state. The resulting optical diode is the first example of a new class of nonreciprocal nanophotonic devices which exploit the chirality of confined photons and which are, in principle, suitable for quantum information processing and future quantum optica...

Sayrin, C; Mitsch, R; Albrecht, B; O'Shea, D; Schneeweiss, P; Volz, J; Rauschenbeutel, A

2015-01-01T23:59:59.000Z

18

Interfacing microwave qubits and optical photons via spin ensembles  

E-Print Network (OSTI)

A protocol is discussed which allows one to realize a transducer for single photons between the optical and the microwave frequency range. The transducer is a spin ensemble, where the individual emitters possess both an optical and a magnetic-dipole transition. Reversible frequency conversion is realized by combining optical photon storage, by means of EIT, with the controlled switching of the coupling between the magnetic-dipole transition and a superconducting qubit, which is realized by means of a microwave cavity. The efficiency is quantified by the global fidelity for transferring coherently a qubit excitation between a single optical photon and the superconducting qubit. We test various strategies and show that the total efficiency is essentially limited by the optical quantum memory: It can exceed 80% for ensembles of NV centers and approaches 99% for cold atomic ensembles, assuming state-of-the-art experimental parameters. This protocol allows one to bridge the gap between the optical and the microwave regime so to efficiently combine superconducting and optical components in quantum networks.

Susanne Blum; Christopher O'Brien; Nikolai Lauk; Pavel Bushev; Michael Fleischhauer; Giovanna Morigi

2015-01-23T23:59:59.000Z

19

Web-interfaced Nonlinear Optical Waveguide and Photonic Crystal Simulator  

SciTech Connect

We report on the development of new methods for the computation of spectral bandpass properties of photonic crystals and for the electromagnetic wave propagation in second order nonlinear optical waveguides. The former is based on a generalization of characteristic matrices while the latter is based on path integrals. Accurate and efficient propagation methods and algorithms form the basis for the construction of design tools for integrated optics.

S. Enguehard; B. Hatfield

2002-06-15T23:59:59.000Z

20

COLLEGE OF OPTICS AND PHOTONICS: CREOL & FPCE Industrial Affiliates Day Friday April 1, 2005  

E-Print Network (OSTI)

COLLEGE OF OPTICS AND PHOTONICS: CREOL & FPCE Industrial Affiliates Day ­ Friday April 1, 2005 "Optics & Photonics ­ Envisioning the Future" ­ Projecting Today's Research Into Tomorrow's Applications:45 "Optics & Photonics in Manufacturing..." Dr. Bruce Craig VP and General Manager, Laser Division, Newport

Van Stryland, Eric

Note: This page contains sample records for the topic "regional optics photonics" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

CREOL & FPCE, THE COLLEGE OF OPTICS AND PHOTONICS Industrial Affiliates Day April 13, 2007  

E-Print Network (OSTI)

CREOL & FPCE, THE COLLEGE OF OPTICS AND PHOTONICS Industrial Affiliates Day ­ April 13, 2007 Theme Dean, College of Optics and Photonics 9:05 "High power lasers, some applications, and their future of Optics & Photonics 9:40 "Attosecond Science and Technology" Dr. Paul Corkum Program Leader, Atomic

Van Stryland, Eric

22

OIL: a nano-photonics optical interconnect library for a new photonic networks-on-chip architecture  

Science Journals Connector (OSTI)

In this paper, we present OIL, a parameterized Optical Interconnect Library of silicon nano-photonic devices for system level interconnect planning/analysis and low power high performance design exploration under a new holistic photonic Networks-on-Chip ... Keywords: computer aided design, high performance, low power, photonic networks-on-chip

Duo Ding; David Z. Pan

2009-07-01T23:59:59.000Z

23

Silicon technology compatible photonic molecules for compact optical signal processing  

SciTech Connect

Photonic molecules (PMs) based on multiple inner coupled microring resonators allow to surpass the fundamental constraint between the total quality factor (Q{sub T}), free spectral range (FSR), and resonator size. In this work, we use a PM that presents doublets and triplets resonance splitting, all with high Q{sub T}. We demonstrate the use of the doublet splitting for 34.2?GHz signal extraction by filtering the sidebands of a modulated optical signal. We also demonstrate that very compact optical modulators operating 2.75 times beyond its resonator linewidth limit may be obtained using the PM triplet splitting, with separation of ?55?GHz.

Barea, Luis A. M., E-mail: barea@ifi.unicamp.br; Vallini, Felipe; Jarschel, Paulo F.; Frateschi, Newton C. [Device Research Laboratory, Applied Physics Department, GlebWataghin Physics Institute, University of CampinasUNICAMP, 13083-859 Campinas, SP (Brazil)] [Device Research Laboratory, Applied Physics Department, GlebWataghin Physics Institute, University of CampinasUNICAMP, 13083-859 Campinas, SP (Brazil)

2013-11-11T23:59:59.000Z

24

February 2002 I Optics & Photonics News 59 1047-6938/02/02/0059/5-$0015.00 Optical Society of America  

E-Print Network (OSTI)

February 2002 I Optics & Photonics News 59 1047-6938/02/02/0059/5-$0015.00 © Optical Society of America O ne of the goals of modern non- linear optics is the development of the ultimate fast, all-optical circuits created in nonlinear bulk media without any fabricated optical waveguide can be achieved

25

Multipoint photonic doppler velocimetry using optical lens elements  

SciTech Connect

A probe including a fisheye lens is disclosed to measure the velocity distribution of a moving surface along many lines of sight. Laser light, directed to the surface and then reflected back from the surface, is Doppler shifted by the moving surface, collected into fisheye lens, and then directed to detection equipment through optic fibers. The received light is mixed with reference laser light and using photonic Doppler velocimetry, a continuous time record of the surface movement is obtained. An array of single-mode optical fibers provides an optic signal to an index-matching lens and eventually to a fisheye lens. The fiber array flat polished and coupled to the index-matching lens using index-matching gel. Numerous fibers in a fiber array project numerous rays through the fisheye lens which in turn project many measurement points at numerous different locations to establish surface coverage over a hemispherical shape with very little crosstalk.

Frogget, Brent Copely; Romero, Vincent Todd

2014-04-29T23:59:59.000Z

26

Optics in Computing OC03 Pa-OFB2 Two-photon volumetric optical disk storage systems  

E-Print Network (OSTI)

Optics in Computing OC03 Pa-OFB2 Two-photon volumetric optical disk storage systems: experimental: sesener@ece.ucsd.edu ABSTRACT Recent performance in two-photon volumetric data storage is presented. Experimental results are presented and theoretical potentials are analyzed. Keywords: volumetric data storage

Esener, Sadik C.

27

All-optical routing of single photons with multiple input and output ports by interferences  

E-Print Network (OSTI)

We propose a waveguide-cavity coupled system to achieve the routing of photons by the phases of other photons. Our router has four input ports and four output ports. The transport of the coherent-state photons injected through any input port can be controlled by the phases of the coherent-state photons injected through other input ports. This control can be achieved when the mean numbers of the routed and control photons are small enough and require no additional control fields. Therefore, the all-optical routing of photons can be achieved at the single-photon level.

Wei-Bin Yan; Bao Liu; Ling Zhou; Heng Fan

2014-09-23T23:59:59.000Z

28

A scalable silicon photonic chip-scale optical switch for high performance computing systems  

E-Print Network (OSTI)

A scalable silicon photonic chip-scale optical switch for high performance computing systems-scale optical switch for scalable interconnect network in high performance computing systems. The proposed

Yoo, S. J. Ben

29

Coupled optical and electrical modeling of solar cell based on conical pore silicon photonic crystals  

E-Print Network (OSTI)

Coupled optical and electrical modeling of solar cell based on conical pore silicon photonic://jap.aip.org/authors #12;Coupled optical and electrical modeling of solar cell based on conical pore silicon photonic, 60 St. George Street, Toronto, Ontario M5S 1A7, Canada (Received 25 March 2013; accepted 27 May 2013

John, Sajeev

30

Axiomatic Geometrical Optics, Abraham-Minkowski Controversy, and Photon Properties Derived Classically  

SciTech Connect

By restating geometrical optics within the eld-theoretical approach, the classical concept of a photon in arbitrary dispersive medium is introduced, and photon properties are calculated unambiguously. In particular, the canonical and kinetic momenta carried by a photon, as well as the two corresponding energy-momentum tensors of a wave, are derived straightforwardly from rst principles of Lagrangian mechanics. The Abraham-Minkowski controversy pertaining to the de nitions of these quantities is thereby resolved for linear waves of arbitrary nature, and corrections to the traditional formulas for the photon kinetic quantities are found. An application of axiomatic geometrical optics to electromagnetic waves is also presented as an example.

L.Y. Dodin and N.J. Fisch

2012-06-18T23:59:59.000Z

31

Search for Photon-Photon Elastic Scattering in the X-ray Region  

E-Print Network (OSTI)

We report the first results of a search for real photon-photon scattering using X rays. A novel system is developed to split and collide X-ray pulses by applying interferometric techniques. A total of $6.5\\times10^{5}$ pulses (each containing about $10^{11}$ photons) from an X-ray Free-Electron Laser are injected into the system. No scattered events are observed, and an upper limit of $1.7\\times 10^{-24}$ ${\\rm m^{2}}$ (95% C.L.) is obtained on the photon-photon elastic scattering cross section at 6.5 keV.

T. Inada; T. Yamaji; S. Adachi; T. Namba; S. Asai; T. Kobayashi; K. Tamasaku; Y. Tanaka; Y. Inubushi; K. Sawada; M. Yabashi; T. Ishikawa

2014-04-18T23:59:59.000Z

32

Optic Ataxia: From Balint's Syndrome to the Parietal Reach Region  

E-Print Network (OSTI)

Neuron Review Optic Ataxia: From Balint's Syndrome to the Parietal Reach Region Richard A. Andersen@vis.caltech.edu http://dx.doi.org/10.1016/j.neuron.2014.02.025 Optic ataxia is a high-order deficit in reaching's syndrome that also includes attentional and gaze disorders. Aspects of optic ataxia are misreaching

Andersen, Richard

33

Strain-tuning of periodic optical devices : tunable gratings and photonic crystals  

E-Print Network (OSTI)

The advancement of micro- and nano-scale optical devices has heralded micromirrors, semiconductor micro- and nano-lasers, and photonic crystals, among many. Broadly defined with the field of microphotonics and microelect ...

Wong, Chee Wei, 1975-

2003-01-01T23:59:59.000Z

34

Materials and devices for optical switching and modulation of photonic integrated circuits  

E-Print Network (OSTI)

The drive towards photonic integrated circuits (PIC) necessitates the development of new devices and materials capable of achieving miniaturization and integration on a CMOS compatible platform. Optical switching: fast ...

Seneviratne, Dilan Anuradha

2007-01-01T23:59:59.000Z

35

Quantum nonlinear optics with single photons enabled by strongly interacting atoms  

E-Print Network (OSTI)

The realization of strong nonlinear interactions between individual light quanta (photons) is a long-standing goal in optical science and engineering, being of both fundamental and technological significance. In conventional ...

Firstenberg, Ofer

36

Optical bistability and free carrier dynamics in graphenesilicon photonic crystal cavities  

E-Print Network (OSTI)

is the electron charge, and is the permittivity of graphene at the drive frequency. For our 1550 nm wavelengths material for integrated photonic devices. Graphene has been examined for its gate-variable optical

Hone, James

37

Two-photon absorption as a limitation to all-optical switching  

Science Journals Connector (OSTI)

Two-photon absorption can place a fundamental limitation on waveguide all-optical switching devices. We have derived a general criterion to describe this limitation that must be...

Mizrahi, Victor; Saifi, M A; Andrejco, M J; DeLong, K W; Stegeman, G I

1989-01-01T23:59:59.000Z

38

Nonlinear optical tuning of photonic crystal microcavities by near-field probe  

SciTech Connect

We report on a nonlinear way to control and tune the dielectric environment of photonic crystal microcavities exploiting the local heating induced by near-field laser excitation at different excitation powers. The temperature gradient due to the optical absorption results in an index of refraction gradient which modifies the dielectric surroundings of the cavity and shifts the optical modes. Reversible tuning can be obtained either by changing the excitation power density or by exciting in different points of the photonic crystal microcavity.

Vignolini, Silvia; Zani, Margherita; Riboli, Francesco; Vinattieri, Anna; Wiersma, Diederik S.; Gurioli, Massimo [LENS and Department of Physics, University of Florence, Via Nello Carrara 1, 50019 Sesto Fiorentino (Italy); Intonti, Francesca [LENS and Department of Physics, University of Florence, Via Nello Carrara 1, 50019 Sesto Fiorentino (Italy); CNISM, Unita di Ricerca di Firenze, Via Sansone 1, 50019 Sesto Fiorentino (Italy); Balet, Laurent; Li, Lianhe [Ecole Polytechnique Federale de Lausanne, Institute of Photonics and Quantum Electronics, Station 3, CH-1015 Lausanne (Switzerland); Colocci, Marcello [CNISM, Unita di Ricerca di Firenze, Via Sansone 1, 50019 Sesto Fiorentino (Italy); Francardi, Marco; Gerardino, Annamaria [Institute of Photonics and Nanotechnology, CNR, via del Cineto Romano 42, 00156 Roma (Italy); Fiore, Andrea [COBRA Research Institute, Eindhoven University of Technology, 5600 MB Eindhoven (Netherlands)

2008-07-14T23:59:59.000Z

39

Linear optics schemes for entanglement distribution with realistic single-photon sources  

E-Print Network (OSTI)

We study the operation of linear optics schemes for entanglement distribution based on nonlocal photon subtraction when input states, produced by imperfect single-photon sources, exhibit both vacuum and multiphoton contributions. Two models for realistic photon statistics with radically different properties of the multiphoton "tail" are considered. The first model assumes occasional emission of double photons and linear attenuation, while the second one is motivated by heralded sources utilizing spontaneous parametric down-conversion. We find conditions for the photon statistics that guarantee generation of entanglement in the relevant qubit subspaces and compare it with classicality criteria. We also quantify the amount of entanglement that can be produced with imperfect single-photon sources, optimized over setup parameters, using as a measure entanglement of formation. Finally, we discuss verification of the generated entanglement by testing Bell's inequalities. The analysis is carried out for two schemes. The first one is the well-established one-photon scheme, which produces a photon in a delocalized superposition state between two nodes, each of them fed with one single photon at the input. As the second scheme, we introduce and analyze a linear-optics analog of the robust scheme based on interfering two Stokes photons emitted by atomic ensembles, which does not require phase stability between the nodes.

Miko?aj Lasota; Czes?aw Radzewicz; Konrad Banaszek; Rob Thew

2014-05-15T23:59:59.000Z

40

Three-photon-absorption resonance for all-optical atomic clocks Sergei Zibrov,1,2,3,4  

E-Print Network (OSTI)

Three-photon-absorption resonance for all-optical atomic clocks Sergei Zibrov,1,2,3,4 Irina, driving atoms coherently from state c to b , fol- lowed by a one-photon absorption from field P, which January 2005; published 7 July 2005 We report an experimental study of an all-optical three-photon-absorption

Walsworth, Ronald L.

Note: This page contains sample records for the topic "regional optics photonics" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

Low Loss Liquid Crystal Photonic Bandgap Fiber in the Near-Infrared Region  

E-Print Network (OSTI)

Low Loss Liquid Crystal Photonic Bandgap Fiber in the Near-Infrared Region Lara SCOLARI1 , Lei WEI1 in the spectral range of 1­2 mm. We achieve in the middle of the near-infrared transmission bandgap the lowest Keywords: photonic bandgap fiber, liquid crystals, absorption loss, all-in-fiber devices, tunability, near-infrared

Wu, Shin-Tson

42

Improving noise threshold for optical quantum computing with the EPR photon source  

E-Print Network (OSTI)

We show that the noise threshold for optical quantum computing can be significantly improved by using the EPR-type of photon source. In this implementation, the detector efficiency $\\eta_{d}$ is required to be larger than 50%, and the source efficiency $\\eta_{s}$ can be an arbitrarily small positive number. This threshold compares favorably with the implementation using the single-photon source, where one requires the combined efficiency $\\eta_{d}\\eta_{s}>2/3$. We discuss several physical setups for realization of the required EPR photon source, including the photon emitter from a single-atom cavity.

Z. -H. Wei; Y. -J. Han; C. H. OH; L. -M. Duan

2009-12-08T23:59:59.000Z

43

Magneto-Optical Thin Films for On-Chip Monolithic Integration of Non-Reciprocal Photonic Devices  

E-Print Network (OSTI)

Achieving monolithic integration of nonreciprocal photonic devices on semiconductor substrates has been long sought by the photonics research society. One way to achieve this goal is to deposit high quality magneto-optical ...

Bi, Lei

44

Present performance & future directions in two-photon addressed volumetric optical disk storage systems  

E-Print Network (OSTI)

Present performance & future directions in two-photon addressed volumetric optical disk storage data storage is presented and future directions discussed. Influence of numerical aperture in a 3-D multi-layer optical data storage system is analyzed. Keywords: volumetric data storage, multi-layer data

Esener, Sadik C.

45

Optical Properties and Wave Propagation in Semiconductor-Based Two-Dimensional Photonic Crystals  

SciTech Connect

This work is a theoretical investigation on the physical properties of semiconductor-based two-dimensional photonic crystals, in particular for what concerns systems embedded in planar dielectric waveguides (GaAs/AlGaAs, GaInAsP/InP heterostructures, and self-standing membranes) or based on macro-porous silicon. The photonic-band structure of photonic crystals and photonic-crystal slabs is numerically computed and the associated light-line problem is discussed, which points to the issue of intrinsic out-of-lane diffraction losses for the photonic bands lying above the light line. The photonic states are then classified by the group theory formalism: each mode is related to an irreducible representation of the corresponding small point group. The optical properties are investigated by means of the scattering matrix method, which numerically implements a variable-angle-reflectance experiment; comparison with experiments is also provided. The analysis of surface reflectance proves the existence of selection rules for coupling an external wave to a certain photonic mode. Such rules can be directly derived from symmetry considerations. Lastly, the control of wave propagation in weak-index contrast photonic-crystal slabs is tackled in view of designing building blocks for photonic integrated circuits. The proposed designs are found to comply with the major requirements of low-loss propagation, high and single-mode transmission. These notions are then collected to model a photonic-crystal combiner for an integrated multi-wavelength-source laser.

Mario Agio

2002-12-31T23:59:59.000Z

46

Improving noise threshold for optical quantum computing with the EPR photon source  

SciTech Connect

We show that the noise threshold for optical quantum computing obtained by Varnava et al. [Phys. Rev. Lett. 100, 060502 (2008)] can be significantly improved by replacing the single-photon source with the Einstein-Podolsky-Rosen (EPR) type of photon source. In this implementation, for an EPR source that emits either nothing (a vacuum state) or a perfect EPR state with probability {eta}{sub s}, the detector efficiency {eta}{sub d} is required to be larger than 50% and the source efficiency {eta}{sub s} can be an arbitrarily small positive number. We also present the error threshold for a more general noise model including additional photon absorption and show that the threshold still compares favorably with the previous results. We discuss several physical setups for realization of the required EPR photon source, including a photon emitter in a single-atom cavity.

Wei, Z.-H. [Centre for Quantum Technologies, National University of Singapore, Singapore 117542 (Singapore); Department of Physics and MCTP, University of Michigan, Ann Arbor, Michigan 48109 (United States); Han, Y.-J.; Duan, L.-M. [Department of Physics and MCTP, University of Michigan, Ann Arbor, Michigan 48109 (United States); Oh, C. H. [Centre for Quantum Technologies, National University of Singapore, Singapore 117542 (Singapore)

2010-06-15T23:59:59.000Z

47

Optics and Photonics in Solar Thermal Energy Technologies  

Science Journals Connector (OSTI)

The complex optical diagnostics employed in the development and application of solar thermal and wind energy technologies are reviewed, with application in particle receivers, solar...

Nathan, G J 'Gus'; Alwahabi, Zeyad; Dally, Bassam B; Medwell, Paul R; Arjomandi, Maziar; Sun, Zhiwei; Lau, Timothy C; van Eyk, Philip

48

All-optical switching and multistability in photonic structures with liquid crystal defects  

E-Print Network (OSTI)

We demonstrate that one-dimensional photonic crystals with pure nematic liquid-crystal defects can operate as all-optical switching devices based on optical orientational nonlinearities of liquid crystals. We show that such a periodic structure is responsible for a modulated threshold of the optical Fr\\'eedericksz transition in the spectral domain, and this leads to all-optical switching and light-induced multistability. This effect has no quasi-statics electric field analogue, and it results from nonlinear coupling between light and a defect mode.

Andrey E. Miroshnichenko; Etienne Brasselet; Yuri S. Kivshar

2007-12-24T23:59:59.000Z

49

Characterization of the bistable wideband optical filter on the basis of nonlinear 2D photonic crystal  

SciTech Connect

In our work, we investigated the wideband optical filter on the basis of nonlinear photonic crystal. The all-optical flip-flop using ultra-short pulses with duration lower than 200 fs is obtained in such filters. Here we pay special attention to the stability problem of the nonlinear element. To investigate this problem, the temporal response demonstrating the flip-flop have been computed within the certain range of the wavelengths as well as at different input power.

Guryev, I. V., E-mail: guryev@ieee.org; Sukhoivanov, I. A., E-mail: guryev@ieee.org; Andrade Lucio, J. A., E-mail: guryev@ieee.org; Manzano, O. Ibarra, E-mail: guryev@ieee.org; Rodriguez, E. Vargaz, E-mail: guryev@ieee.org; Gonzales, D. Claudio, E-mail: guryev@ieee.org; Chavez, R. I. Mata, E-mail: guryev@ieee.org; Gurieva, N. S., E-mail: guryev@ieee.org [University of Guanajuato, Engineering division (Mexico)

2014-05-15T23:59:59.000Z

50

Nano photonic and ultra fast all-optical processing modules  

Science Journals Connector (OSTI)

In this paper we present an all-optical approach allowing the realization of logic gates and other building blocks of a processing unit. The modules have dimensions of only few...

Zalevsky, Zeev; Rudnitsky, Arkady; Nathan, Menachem

2005-01-01T23:59:59.000Z

51

Nanostructured Optical Photonic Crystal Biosensor for HIV Viral Load Measurement  

E-Print Network (OSTI)

Detecting and quantifying biomarkers and viruses in biological samples have broad applications in early disease diagnosis and treatment monitoring. We have demonstrated a label-free optical sensing mechanism using ...

Shafiee, Hadi

52

Two-photon optical pumping of NH/sub 3/ in a multipass cell  

SciTech Connect

A multipass cell was used in optical pumping of ammonia molecules by CO/sub 2/ laser radiation. Several new lasing lines were observed in the case of two-photon optical pumping of the NH/sub 3/ molecule at wavelengths in the range 16--35 ..mu... The output power of the various lines was in the range 10--50 kW. The divergence of the resultant radiation was diffraction-limited. A theoretical study was made of the two-photon pumping process. A stable (on the frequency scale) maximum was found in the gain profile of the output radiation. It was concluded that it should be possible to increase the energy and extend the emission spectrum of an ammonia laser pumped by double-photon absorption.

Bobrovskii, A.N.; Kiselev, V.P.; Kozhevnikov, A.V.; Likhanskii, V.V.; Mishchenko, V.A.; Myl'nikov, G.D.

1983-11-01T23:59:59.000Z

53

Surface-Enhanced Raman Scattering with Ag Nanoparticles Optically Trapped by a Photonic Crystal Cavity  

E-Print Network (OSTI)

on the chemical to be sensed. Figure 1a shows a schematic diagram of the trapping-assisted SERS platform we) platform by optically trapping Ag nanoparticles with a photonic crystal cavity integrated, unattended systems for the continual monitoring of chemicals in air and water. A high- performance substrate

54

Nonlinear Photon-Assisted Tunneling Transport in Optical Gap Antennas  

Science Journals Connector (OSTI)

(16, 17) For instance, incoming photons can exchange energy with tunneling charges modifying thus the conductance of the barrier(18, 19) and strong-field effects were recently reported. ... (32) The height ? of the potential barriers can be directly deduced from these two minima. ... Two lock-in amplifiers referenced at Fmod and 2Fmod output a signal proportional to the differential conductance I? = Vac(?Ib/?Vb) of the gap antenna and signal proportional to the nonlinearity of the conductance I? = 1/4Vac2(?2Ib/?Vb2), respectively. ...

Arnaud Stolz; Johann Berthelot; Marie-Maxime Mennemanteuil; Grard Colas des Francs; Laurent Markey; Vincent Meunier; Alexandre Bouhelier

2014-04-03T23:59:59.000Z

55

Dynamically Reconfigurable Photonic Resources for Optically Connected Data Center Networks  

E-Print Network (OSTI)

with traffic demands will either be prohibitively costly, overly complex, or result in unsustainable energy. Optical multicasting and subnet formation is demonstrated between four ports at up to 80 Gb/s per port performance requirements demanded by modern data centers. Moreover, application heterogeneity and multitenancy

Bergman, Keren

56

Two-photon E1-M1 optical clock  

Science Journals Connector (OSTI)

An allowed E1-M1 excitation scheme creates optical access to the 1S0?3P0 clock transition in group-II-type atoms. This method does not require the hyperfine mixing or application of an external magnetic field of other optical clock systems. The advantages of this technique include a Doppler-free excitation scheme and increased portability with the use of vapor cells. We will discuss technical mechanisms of a monochromatic excitation scheme for a hot E1-M1 clock and briefly discuss a bichromatic scheme to eliminate light shifts. We determine the optimal experimental parameters for Hg, Yb, Ra, Sr, Ba, Ca, Mg, and Be and calculate that neutral Hg has ideal properties for a hot, portable frequency standard.

E. A. Alden; K. R. Moore; A. E. Leanhardt

2014-07-25T23:59:59.000Z

57

Role of photonic angular momentum states in nonreciprocal diffraction from magneto-optical cylinder arrays  

SciTech Connect

Optical eigenstates in a concentrically symmetric resonator are photonic angular momentum states (PAMSs) with quantized optical orbital angular momentums (OAMs). Nonreciprocal optical phenomena can be obtained if we lift the degeneracy of PAMSs. In this article, we provide a comprehensive study of nonreciprocal optical diffraction of various orders from a magneto-optical cylinder array. We show that nonreciprocal diffraction can be obtained only for these nonzero orders. Role of PAMSs, the excitation of which is sensitive to the directions of incidence, applied magnetic field, and arrangement of the cylinders, are studied. Some interesting phenomena such as a dispersionless quasi-omnidirectional nonreciprocal diffraction and spikes associated with high-OAM PAMSs are present and discussed.

Guo, Tian-Jing; Wu, Li-Ting; Yang, Mu; Guo, Rui-Peng; Cui, Hai-Xu; Chen, Jing, E-mail: jchen4@nankai.edu.cn [MOE Key Laboratory of Weak-Light Nonlinear Photonics, School of Physics, Nankai University, Tianjin 300071 (China)

2014-07-15T23:59:59.000Z

58

Broadband CMOS-Compatible Silicon Photonic Electro-Optic Switch for Photonic Networks-on-Chip  

E-Print Network (OSTI)

-on-chip (NoCs) offer an attractive solution for bandwidth scalability with reduced power consumption reconfiguration [1]. Electro-optic control of these broadband switches enables a more scalable and energy signal between the through port and the drop port is accomplished with the detuning of the right cavity

Bergman, Keren

59

Photonic Molecules and Spectral Engineering  

E-Print Network (OSTI)

This chapter reviews the fundamental optical properties and applications of photonic molecules (PMs) photonic structures formed by electromagnetic coupling of two or more optical microcavities (photonic atoms). Controllable ...

Boriskina, Svetlana V.

2010-01-01T23:59:59.000Z

60

Atoms and Photons: One Perspective on Quantum Optics at the College of Optical Sciences  

Science Journals Connector (OSTI)

Over the years quantum optics at the College of Optical Sciences has been shaped by theory and experiment alike. The modern era of atomic physics arrived in the 1990's, and has brought...

Jessen, Poul S

Note: This page contains sample records for the topic "regional optics photonics" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


61

Photon Sciences Directorate | 2010 Annual Report | Beamline & Optics R&D:  

NLE Websites -- All DOE Office Websites (Extended Search)

Beamline & Optics R&D: Enhancing Tools at NSLS, NSLS-II Beamline & Optics R&D: Enhancing Tools at NSLS, NSLS-II Qun Shen "Synchrotron sources have quickly become an essential tool for a wide spectrum of research. All the action takes place at beamlines, each one consisting of a suite of sophisticated scientific instruments. The robust beamlines at NSLS produce remarkable science, and we made excellent progress on developing NSLS-II beamlines and associated science programs." - Qun Shen Director, Photon Division While keeping the existing ring and beamline mechanical systems running, Photon Sciences staff completed a number of R&D projects this year that will improve the tools of researchers at NSLS and, in the near future, NSLS-II. One of the major accomplishments was the installation and commissioning of

62

Mitigation of optical bistability in Si-based mid-infrared photonic crystal cavities using surface treatments  

Science Journals Connector (OSTI)

We present evidence of optical bistability in our mid-infrared photonic crystal cavities operating at 4.5 m. Surface treatments are used to mitigate bistability and improve device...

Shankar, Raji; Bulu, Irfan; Leijssen, Rick; Kogos, Leonard; Loncar, Marko

63

Energy efficient all-optical signal processing: a comparison of slow-light photonic crystals and nanowires  

Science Journals Connector (OSTI)

We compare the energy performance of nanowires to slow-light photonic crystals in nonlinear optical processes. We outline the regimes where each is energy efficient suggesting a route...

Husko, Chad; Eggleton, Benjamin J

64

Total Absorption in a Graphene Monolayer in the Optical Regime by Critical Coupling with a Photonic Crystal Guided Resonance  

E-Print Network (OSTI)

Total Absorption in a Graphene Monolayer in the Optical Regime by Critical Coupling with a Photonic demonstrate total absorption in graphene in the near-infrared and visible wavelength ranges by means of the photonic crystal resonance. We discuss the general theory and conditions for absorption enhancement

Fan, Shanhui

65

High-performance GaAs/AlGaAs optical phase modulators for microwave photonic integrated circuits  

SciTech Connect

A high-performance high-speed optical phase modulator for photonic integrated circuit (PIC) use is described. Integration of these optical phase modulators into a real system (compass) is also discussed. The optical phase modulators are based on depletion-edge translation and have experimentally provided optical phase shifts in excess of 60{degrees}/V{center_dot}mm with approximately 4 dB/cm loss while simultaneously demonstrating bandwidths in excess of 10 GHz.

Hietala, V.M.; Kravitz, S.H.; Armendariz, M.G.; Vawter, G.A.; Carson, R.F.

1994-03-01T23:59:59.000Z

66

Presented as SPIE Optics+Photonics 2007 Coastal Ocean Remote Sensing Conf. paper 6680-33 Aug. 27, San Diego, CA 1 Submerged turbulence detection with optical satellites  

E-Print Network (OSTI)

Presented as SPIE Optics+Photonics 2007 Coastal Ocean Remote Sensing Conf. paper 6680-33 Aug. 27. These were part of the RASP Remote Anthropogenic Sensing Program. Ikonos and Quickbird optical satellite) turbulence in outfall fossil turbulence patches that transmit heat, mass, chemical species, momentum

Wang, Deli

67

TOWARDS CIGS SOLAR CELLS WITH REDUCED FILM THICKNESS: A STUDY OF OPTICAL PROPERTIES AND OF PHOTONIC STRUCTURES FOR LIGHT TRAPPING  

E-Print Network (OSTI)

TOWARDS CIGS SOLAR CELLS WITH REDUCED FILM THICKNESS: A STUDY OF OPTICAL PROPERTIES AND OF PHOTONIC ABSTRACT: In view of large-scale exploitation of CuIn1-xGaxSe2 (CIGS) solar cells for photovoltaic energy. In this work we perform a full study of optical properties of CIGS solar cells grown by a hybrid sputtering

68

IEEE PHOTONICS TECHNOLOGY LETTERS, VOL. 15, NO. 1, JANUARY 2003 81 Tunable Microfluidic Optical-Fiber Devices Based on  

E-Print Network (OSTI)

IEEE PHOTONICS TECHNOLOGY LETTERS, VOL. 15, NO. 1, JANUARY 2003 81 Tunable Microfluidic Optical. Krupenkine, K. Baldwin, and J. A. Rogers Abstract--This letter introduces a class of tunable microfluidic pressure pumping and thermo-optic tuning of microfluidic plugs in microstructured, or "holey," fiber yields

Rogers, John A.

69

Optical bistability in a one-dimensional photonic crystal resonator using a reverse-biased pn-junction  

E-Print Network (OSTI)

Optical bistability provides a simple way to control light with light. We demonstrate low-power thermo-optical bistability caused by the Joule heating mechanism in a one-dimensional photonic crystal (PC) nanobeam resonator with a moderate quality factor (Q ~ 8900) with an embedded reverse-biased pn-junction. We show that the photocurrent induced by the linear absorption in this compact resonator considerably reduces the threshold optical power. The proposed approach substantially relaxes the requirements on the input optical power for achieving optical bistability and provides a reliable way to stabilize the bistable features of the device.

Sodagar, Majid; Eftekhar, Ali A; Adibi, Ali

2014-01-01T23:59:59.000Z

70

Bio-Optical Response and Coupling with Physical Processes in the Lombok Strait Region  

E-Print Network (OSTI)

Bio-Optical Response and Coupling with Physical Processes in the Lombok Strait Region Burton H.boss@maine.edu ABSTRACT The optical structure and variability of the Lombok Straits region is poorly understood, but available remotely sensed ocean color indicates that there is a strong optical response and signal

Boss, Emmanuel S.

71

On Approaching the Ultimate Limits of Photon-Efficient and Bandwidth-Efficient Optical Communication  

E-Print Network (OSTI)

It is well known that ideal free-space optical communication at the quantum limit can have unbounded photon information efficiency (PIE), measured in bits per photon. High PIE comes at a price of low dimensional information efficiency (DIE), measured in bits per spatio-temporal-polarization mode. If only temporal modes are used, then DIE translates directly to bandwidth efficiency. In this paper, the DIE vs. PIE tradeoffs for known modulations and receiver structures are compared to the ultimate quantum limit, and analytic approximations are found in the limit of high PIE. This analysis shows that known structures fall short of the maximum attainable DIE by a factor that increases linearly with PIE for high PIE. The capacity of the Dolinar receiver is derived for binary coherent-state modulations and computed for the case of on-off keying (OOK). The DIE vs. PIE tradeoff for this case is improved only slightly compared to OOK with photon counting. An adaptive rule is derived for an additive local oscillator that maximizes the mutual information between a receiver and a transmitter that selects from a set of coherent states. For binary phase-shift keying (BPSK), this is shown to be equivalent to the operation of the Dolinar receiver. The Dolinar receiver is extended to make adaptive measurements on a coded sequence of coherent state symbols. Information from previous measurements is used to adjust the a priori probabilities of the next symbols. The adaptive Dolinar receiver does not improve the DIE vs. PIE tradeoff compared to independent transmission and Dolinar reception of each symbol.

Sam Dolinar; Kevin M. Birnbaum; Baris I. Erkmen; Bruce Moision

2011-04-13T23:59:59.000Z

72

ENSC 460/894: Special Topics Photonics and Laser Applications in Engineering: Spring 2009 1 Optical and Laser Engineering Applications  

E-Print Network (OSTI)

, surface melting, alloying, cladding, cutting, medical applications. Week 12: Laser Consumer and HolographyENSC 460/894: Special Topics Photonics and Laser Applications in Engineering: Spring 2009 1 Optical and Laser Engineering Applications ENSC 470-4 (Undergraduate) (3-0-2) 894-3 (Graduate) (3-0-0) Professor

Chapman, Glenn H.

73

A quantum dot single-photon source with on-the-fly all-optical polarization control and timed emission  

E-Print Network (OSTI)

Sources of single photons are key elements in the study of basic quantum optical concepts and applications in quantum information science. Among the different sources available, semiconductor quantum dots excel with their straight forward integrability in semiconductor based on-chip solutions and the potential that photon emission can be triggered on demand. Usually, the photon emission event is part of a cascaded biexciton-exciton emission scheme. Important properties of the emitted photon such as polarization and time of emission are either probabilistic in nature or pre-determined by electronic properties of the system. In this work, we study the direct two-photon emission from the biexciton. We show that emission through this higher-order transition provides a much more versatile approach to generate a single photon. In the scheme we propose, the two-photon emission from the biexciton is enabled by a laser field (or laser pulse) driving the system into a virtual state inside the band gap. From this interm...

Heinze, Dirk; Schumacher, Stefan

2014-01-01T23:59:59.000Z

74

3D Photonic Crystals for Photon Management in Solar Cells  

Science Journals Connector (OSTI)

Photon management is a key element to optimize the optical and electro-optical performance of solar cells. The potential of 3D photonic crystals for photon management in solar cells...

Wehrspohn, Ralf; Sprafke, Alexander

75

Nonlocal coupling effects on single-photon transmission in a one-dimensional waveguide interacted with a side optical cavity  

E-Print Network (OSTI)

The nonlocal coupling effect between a one-dimensional waveguide (1DW) and a side optical cavity (SOC) is studied. We first find the real-space Hamiltonian of the nonlocal-coupling system of the 1DW and SOC, and then derive out an equation determining the energy of the hybridization state between the 1DW and SOC modes and an analytic formula for the single-photon transmission. Through them, we recognize that the single-photon transmission-dip position can be changed by adjusting the SOC size and the coupling strength between the 1DW and SOC. The transmission spectra strongly depends on the nonlocal-coupling function between the 1DW and SOC, and holds an asymmetry line shape. At last, we simulate the asymmetry of the single-photon transmission by a gold-based waveguide coupled with a rectangular SOC.

Zhang, Yongyou

2014-01-01T23:59:59.000Z

76

Evaluation of Al{sub 2}O{sub 3}:C optically stimulated luminescence (OSL) dosimeters for passive dosimetry of high-energy photon and electron beams in radiotherapy  

SciTech Connect

This article investigates the performance of Al{sub 2}O{sub 3}:C optically stimulated luminescence dosimeters (OSLDs) for application in radiotherapy. Central-axis depth dose curves and optically stimulated luminescence (OSL) responses were obtained in a water phantom for 6 and 18 MV photons, and for 6, 9, 12, 16, and 20 MeV electron beams from a Varian 21EX linear accelerator. Single OSL measurements could be repeated with a precision of 0.7% (one standard deviation) and the differences between absorbed doses measured with OSLDs and an ionization chamber were within {+-}1% for photon beams. Similar results were obtained for electron beams in the low-gradient region after correction for a 1.9% photon-to-electron bias. The distance-to-agreement values were of the order of 0.5-1.0 mm for electrons in high dose gradient regions. Additional investigations also demonstrated that the OSL response dependence on dose rate, field size, and irradiation temperature is less than 1% in the conditions of the present study. Regarding the beam energy/quality dependence, the relative response of the OSLD for 18 MV was (0.51{+-}0.48)% of the response for the 6 MV photon beam. The OSLD response for the electron beams relative to the 6 MV photon beam. The OSLD response for the electron beams relative to the 6 MV photon beam was in average 1.9% higher, but this result requires further confirmation. The relative response did not seem to vary with electron energy at d{sub max} within the experimental uncertainties (0.5% in average) and, therefore, a fixed correction factor of 1.9% eliminated the energy dependence in our experimental conditions.

Yukihara, E. G.; Mardirossian, G.; Mirzasadeghi, M.; Guduru, S.; Ahmad, S. [Department of Physics, Oklahoma State University, Stillwater, Oklahoma 74078 (United States); Department of Radiation Oncology, Mount Sinai Comprehensive Cancer Center, Miami Beach, Florida 33140 (United States); Department of Radiation Oncology, University of Oklahoma Health Sciences Center, 825 Northeast 10th Street, OUPB 1430, Oklahoma City, Oklahoma 73104 (United States); Department of Physics, Oklahoma State University, Stillwater, Oklahoma 74078 (United States); Department of Radiation Oncology, University of Oklahoma Health Sciences Center, 825 Northeast 10th Street, OUPB 1430, Oklahoma City, Oklahoma 73104 (United States)

2008-01-15T23:59:59.000Z

77

Design, fabrication and optical characterization of photonic crystal assisted thin film monocrystalline-silicon solar cells  

Science Journals Connector (OSTI)

In this paper, we present the integration of an absorbing photonic crystal within a monocrystalline silicon thin film photovoltaic stack fabricated without epitaxy. Finite difference...

Meng, Xianqin; Depauw, Valrie; Gomard, Guillaume; El Daif, Ounsi; Trompoukis, Christos; Drouard, Emmanuel; Jamois, Ccile; Fave, Alain; Dross, Frdric; Gordon, Ivan; Seassal, Christian

2012-01-01T23:59:59.000Z

78

High heat load x-ray optics research and development at the Advanced Photon Source -- An overview  

SciTech Connect

Insertion devices at third generation synchrotron radiation sources such as the APS are capable of producing x-ray beams with total power in excess of 7 kilowatts or power densities of 150 watts/mm{sup 2} at a typical location of the optical components. Optical elements subjected to these types of heat fluxes will suffer considerably unless carefully designed to withstand these unprecedented power loadings. At the Advanced Photon Source (APS), we have an aggressive R&D program aimed at investigating possible methods to mitigate thermal distortions. The approaches being studied include, improved heat exchangers, use of liquid gallium and liquid nitrogen as coolants, novel crystal geometries, power filtering, and replacement of silicon with diamond for crystal monochromators. This paper will provide an overview of the high heat load x-ray optics program at the APS.

Lee, Wah-Keat; Mills, D.M.

1993-09-01T23:59:59.000Z

79

The colour of the Mediterranean Sea: Global versus regional bio-optical algorithms evaluation and implication  

E-Print Network (OSTI)

measurements, covering most of the trophic regimes of the basin, we validated two existing regional algorithms algorithm, the MedOC4. Using an independent set of in situ chlorophyll data, we quantified the uncertaintiesThe colour of the Mediterranean Sea: Global versus regional bio-optical algorithms evaluation

80

Application of slow-light photonic crystal structures for ultra-high speed all-optical analog-to-digital conversion  

E-Print Network (OSTI)

Application of slow-light photonic crystal structures for ultra-high speed all-optical analog circuits. Proposed usage of such controlled light speed devices includes buffers, synchronizer with the reduction of light speed), and slow-light all-optical nonlinear devices [9, 10] taking advantage

Park, Namkyoo

Note: This page contains sample records for the topic "regional optics photonics" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


81

E-Print Network 3.0 - applied optical metrology Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

Optical Sciences Summary: Research - Quantum Optics Applied Optics & Photonics - Optoelectronics - Optical Communications - Medical... Optics Engineering - Optical System Design...

82

MTL ANNUAL RESEARCH REPORT 2014 Photonics 99 Photonics, Optoelectronics  

E-Print Network (OSTI)

MTL ANNUAL RESEARCH REPORT 2014 Photonics 99 Photonics, Optoelectronics Generating Optical Orbital................................................................................................................................................118 Optoelectronics Based on Monolayer WSe2 p-n Diodes

Reif, Rafael

83

Toward whole-body optical imaging of rats using single-photon counting fluorescence tomography  

Science Journals Connector (OSTI)

We used single-photon counting (SPC) detection for diffuse fluorescence tomography to image nanomolar (nM) concentrations of reporter dyes through a rat. Detailed phantom data are...

Leblond, Frederic; Tichauer, Kenneth M; Holt, Robert W; El-Ghussein, Fadi; Pogue, Brian W

2011-01-01T23:59:59.000Z

84

Superconducting nanowire single-photon detectors integrated with optical nano-antennae  

E-Print Network (OSTI)

Optical nano-antennae have been integrated with semiconductor lasers to intensify light at the nanoscale and photodiodes to enhance photocurrent. In quantum optics, plasmonic metal structures have been used to enhance ...

Berggren, Karl K.

85

Phase-matched emission from an optically thin medium following one-photon pulse excitation: Energy considerations  

SciTech Connect

Scully and coworkers [M. O. Scully, E. S. Fry, C. H. R. Oii, and K. Wodkiewicz, Phys. Rev. Lett. 96, 010501 (2006)] demonstrated that there is directional, phase-matched emission following the excitation of an ensemble of atoms by a single-photon pulse. While the phase-matched emission intensity is proportional to the the number of atoms, for optically thin samples the total energy emitted in the phase-matched direction is much less than that radiated in other directions. Moreover, even for optically thin samples, it is necessary to take into account effects related to cooperative decay if energy is to be conserved in the overall emission process. An analytic calculation is presented to show explicitly how cooperative decay reduces the incoherent emission and restores energy conservation in this low-density limit.

Berman, P. R.; Le Goueet, J.-L. [Michigan Center for Theoretical Physics and Physics Department, University of Michigan, 450 Church Street, Ann Arbor, Michigan 48109-1040 (United States); Laboratoire Aime Cotton, CNRS UPR3321, Universite Paris Sud, Batiment 505, Campus Universitaire, F-91405 Orsay (France)

2011-03-15T23:59:59.000Z

86

All-Optical Switching Using the Quantum Zeno Effect and Two-Photon Absorption  

E-Print Network (OSTI)

We have previously shown that the quantum Zeno effect can be used to implement quantum logic gates for quantum computing applications, where the Zeno effect was produced using a strong two-photon absorbing medium. Here we show that the Zeno effect can also be used to implement classical logic gates whose inputs and outputs are high-intensity fields (coherent states). The operation of the devices can be understood using a quasi-static analysis, and their switching times are calculated using a dynamic approach. The two-photon absorption coefficient of rubidium vapor is shown to allow operation of these devices at relatively low power levels.

B. C. Jacobs; J. D. Franson

2009-05-08T23:59:59.000Z

87

Photonic-powered cable assembly  

DOE Patents (OSTI)

A photonic-cable assembly includes a power source cable connector ("PSCC") coupled to a power receive cable connector ("PRCC") via a fiber cable. The PSCC electrically connects to a first electronic device and houses a photonic power source and an optical data transmitter. The fiber cable includes an optical transmit data path coupled to the optical data transmitter, an optical power path coupled to the photonic power source, and an optical feedback path coupled to provide feedback control to the photonic power source. The PRCC electrically connects to a second electronic device and houses an optical data receiver coupled to the optical transmit data path, a feedback controller coupled to the optical feedback path to control the photonic power source, and a photonic power converter coupled to the optical power path to convert photonic energy received over the optical power path to electrical energy to power components of the PRCC.

Sanderson, Stephen N.; Appel, Titus James; Wrye, IV, Walter C.

2013-01-22T23:59:59.000Z

88

Photonic-powered cable assembly  

DOE Patents (OSTI)

A photonic-cable assembly includes a power source cable connector ("PSCC") coupled to a power receive cable connector ("PRCC") via a fiber cable. The PSCC electrically connects to a first electronic device and houses a photonic power source and an optical data transmitter. The fiber cable includes an optical transmit data path coupled to the optical data transmitter, an optical power path coupled to the photonic power source, and an optical feedback path coupled to provide feedback control to the photonic power source. The PRCC electrically connects to a second electronic device and houses an optical data receiver coupled to the optical transmit data path, a feedback controller coupled to the optical feedback path to control the photonic power source, and a photonic power converter coupled to the optical power path to convert photonic energy received over the optical power path to electrical energy to power components of the PRCC.

Sanderson, Stephen N; Appel, Titus James; Wrye, IV, Walter C

2014-06-24T23:59:59.000Z

89

High-speed delay tuning of slow light in pin-diode-incorporated photonic crystal waveguide  

Science Journals Connector (OSTI)

We demonstrate the high-speed electrical delay tuning of slow light pulses using Si photonic crystal waveguides. The device has an i-region-chirped pin diode, within which thermo-optic...

Hayakawa, Ryo; Ishikura, Norihiro; Nguyen, Hong C; Baba, Toshihiko

2013-01-01T23:59:59.000Z

90

Optical properties of gyroid structured materials: from photonic crystals to metamaterials  

E-Print Network (OSTI)

arrow; a right-handed helical element by a red arrow. (b-d) used with permission from [20]. two single gyroid networks. As |t| increases so does the volume fraction of the matrix phase. One class of physical systems in which the gyroid morphology... ) of roughly 20% [6]. Remarkably, even considerable modification of the structure, i.e. randomisation and other imperfections, does not necessarily destroy the photonic band gap, although it does strongly reduce its width [57, 58]. This robustness to structural...

Dolan, James A.; Wilts, Bodo D.; Vignolini, Silvia; Baumberg, Jeremy J.; Steiner, Ullrich; Wilkinson, Timothy D.

2014-01-01T23:59:59.000Z

91

Coherent optical polarization of bulk GaAs studied by femtosecond photon-echo spectroscopy  

Science Journals Connector (OSTI)

The nonlinear polarization close to the band gap of GaAs is studied by spectrally and temporally resolved four-wave mixing. Excitonic and free carrier contributions both excited within the bandwidth of the 100 fs pulses are distinguished for the first time. The excitonic part dominates at carrier densities below 1016 cm-3. At higher density, nonthermalized free carriers give rise to an additional component resonant to the pulse that shows a photon-echo-like time behavior. Monte Carlo simulations including the coherent polarization and the scattering dynamics of the carriers account for the data.

A. Lohner; K. Rick; P. Leisching; A. Leitenstorfer; T. Elsaesser; T. Kuhn; F. Rossi; W. Stolz

1993-07-05T23:59:59.000Z

92

PHYSICAL REVIEW B 85, 033303 (2012) Single-photon nonlinear optics with Kerr-type nanostructured materials  

E-Print Network (OSTI)

processing based on photonic plat- forms is one of the most promising routes toward a fully inte- grated the transmission of a single photon when another photon is present in the cavity: a photon blockade effect.9 the line broadening induced by losses and the decoherence rate, , as shown in Fig. 1. Theoretical proposals

93

Broadband optical coupling between microstructured fibers and photonic band gap circuits: Two-dimensional paradigms  

E-Print Network (OSTI)

simple two-dimensional design models. We demonstrate an effective large- bandwidth small-footprint beam platform for integrated optics. Unlike conventional paradigms such as silicon on insulator SOI waveguides that guide light on a chip by total internal reflection index guiding , PBG-based microcircuits can guide

John, Sajeev

94

Synergistic plasmonic and photonic crystal light-trapping: Architectures for optical up-  

E-Print Network (OSTI)

in crystalline silicon solar cell technology for industrial mass production," NPG Asia Mater. 2(3), 96­102 (2010- conversion in thin-film solar cells Khai Q. Le1,3,* and Sajeev John1,2 1 Department of Physics, University conversion efficiency in ultra-thin-film silicon solar cells. ©2013 Optical Society of America OCIS codes

John, Sajeev

95

Optical power of semiconductor lasers with a low-dimensional active region  

SciTech Connect

A comprehensive analytical model for the operating characteristics of semiconductor lasers with a low-dimensional active region is developed. Particular emphasis is given to the effect of capture delay of both electrons and holes from a bulk optical confinement region into a quantum-confined active region and an extended set of rate equations is used. We derive a closed-form expression for the internal quantum efficiency as an explicit function of the injection current and parameters of a laser structure. Due to either electron or hole capture delay, the internal efficiency decreases with increasing injection current above the lasing threshold thus causing sublinearity of the light-current characteristic of a laser.

Asryan, Levon V., E-mail: asryan@vt.edu [Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061 (United States); Sokolova, Zinaida N., E-mail: zina.sokolova@mail.ioffe.ru [Ioffe Physico-Technical Institute, St. Petersburg 194021 (Russian Federation)

2014-01-14T23:59:59.000Z

96

Low-energy photon scattering off 142,146,148,150Nd: An investigation in the mass region of a nuclear shape transition  

Science Journals Connector (OSTI)

Nuclear resonance fluorescence experiments have been performed on the nuclei 142,146,148,150Nd, which are located in the mass region of a nuclear shape transition from a spherical (142Nd) to a well-deformed shape (150Nd). Bremsstrahlung of 4.1 MeV endpoint energy served as the photon source. The scattered photons were detected by high-resolution Ge-spectrometers. Precise excitation energies, decay branching ratios, and ground-state decay widths of numerous new spin-1 states have been extracted.

H.H. Pitz; R.D. Heil; U. Kneissl; S. Lindenstruth; U. Seemann; R. Stock; C. Wesselborg; A. Zilges; P. Von Brentano; S.D. Hoblit; A.M. Nathan

1990-01-01T23:59:59.000Z

97

2076 OPTICS LETTERS / Vol. 27, No. 23 / December 1, 2002 Ultrasensitive and high-dynamic-range two-photon absorption  

E-Print Network (OSTI)

-photon absorption near 1.5 mm in several devices, including silicon avalanche1 and nonavalanche2 pho- todiodes, InGaAsP-photon absorption in a GaAs photomultiplier tube Jeffrey M. Roth and T. E. Murphy MIT Lincoln Laboratory, Lexington, 2002 We demonstrate improved efficiency and dynamic range for two-photon absorption at 1.5 mm

Murphy, Thomas E.

98

A New Method for Measuring X-ray Optics Aberrations | Advanced Photon  

NLE Websites -- All DOE Office Websites (Extended Search)

New Clues for Asthma Treatment New Clues for Asthma Treatment Extending Resonant Diffraction to Very High Energies for Structural Studies of Complex Materials Tuning the Collective Properties of Artificial Nanoparticle Supercrystals The Workings of a Key Staph Enzyme and How to Block It Simple Lithium Is Good For Many Surprises Science Highlights Archives: 2013 | 2012 | 2011 | 2010 2009 | 2008 | 2007 | 2006 2005 | 2004 | 2003 | 2002 2001 | 2000 | 1998 | Subscribe to APS Science Highlights rss feed A New Method for Measuring X-ray Optics Aberrations MARCH 31, 2011 Bookmark and Share Top: Experimental setup. Bottom: Measured and simulated lens aberrations (left) and their corresponding through focus amplitude of reconstructions (right) for different lens angular misalignments. (From Manuel

99

Embedded Fiber Optic Probes to Measure Detonation Velocities Using the Photonic Doppler Velocimeter  

SciTech Connect

Detonation velocities for high explosives can be in the 7 to 8 km/s range. Previous work has shown that these velocities may be measured by inserting an optical fiber probe into the explosive assembly and recording the velocity time history using a Fabry-Perot velocimeter. The measured velocity using this method, however, is the actual velocity multiplied times the refractive index of the fiber core, which is on the order of 1.5. This means that the velocimeter diagnostic must be capable of measuring velocities as high as 12 km/s. Until recently, a velocity of 12 km/s was beyond the maximum velocity limit of a homodyne-based velocimeter. The limiting component in a homodyne system is usually the digitizer. Recently, however, digitizers have come on the market with 20 GHz bandwidth and 50 GS/s sample rate. Such a digitizer coupled with high bandwidth detectors now have the total bandwidth required to make velocity measurements in the 12 km/s range. This paper describes measurements made of detonation velocities using a high bandwidth homodyne system.

Hare, D E; Holtkamp, D B; Strand, O T

2010-03-02T23:59:59.000Z

100

Green photonics  

Science Journals Connector (OSTI)

Photonics, the broad merger of electronics with the optical sciences, encompasses such a wide swath of technology that its impact is almost universal in our everyday lives. This is a broad overview of some aspects of the industry and their contribution to the 'green' or environmental movement. The rationale for energy conservation is briefly discussed and the impact of photonics on our everyday lives and certain industries is described. Some opinions from industry are presented along with market estimates. References are provided to some of the most recent research in these areas.

Frederic Quan

2012-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "regional optics photonics" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


101

2070 OPTICS LETTERS / Vol. 29, No. 17 / September 1, 2004 400-photon-per-pulse ultrashort pulse autocorrelation  

E-Print Network (OSTI)

-photon absorption in silicon avalanche photodiodes,3 GaAs photomultiplier tubes,4 and InGaAsP laser diodes.5

Purdue University

103

Nanowires and nanoribbons as subwavelength optical waveguides and their use as components in photonic circuits and devices  

DOE Patents (OSTI)

Nanoribbons and nanowires having diameters less than the wavelength of light are used in the formation and operation of optical circuits and devices. Such nanostructures function as subwavelength optical waveguides which form a fundamental building block for optical integration. The extraordinary length, flexibility and strength of these structures enable their manipulation on surfaces, including the precise positioning and optical linking of nanoribbon/wire waveguides and other nanoribbon/wire elements to form optical networks and devices. In addition, such structures provide for waveguiding in liquids, enabling them to further be used in other applications such as optical probes and sensors.

Yang, Peidong; Law, Matt; Sirbuly, Donald J.; Johnson, Justin C.; Saykally, Richard; Fan, Rong; Tao, Andrea

2012-10-02T23:59:59.000Z

104

Graphene in a photonic metamaterial  

Science Journals Connector (OSTI)

We demonstrate a photonic metamaterial that shows extraordinary sensitivity to the presence of a single atomic layer of graphene on its surface. Metamaterial's optical transmission...

Papasimakis, Nikitas; Luo, Zhiqiang; Shen, Ze Xiang; De Angelis, Francesco; Di Fabrizio, Enzo; Nikolaenko, Andrey E; Zheludev, Nikolay I

2010-01-01T23:59:59.000Z

105

Adaptive algorithms for QCSE optical modulators Excitonic optical absorption at near band gap photon energies in III-V compound semiconductor  

E-Print Network (OSTI)

. Typically, such designs make use of simple rectangular potential wells in the AlGaAs/GaAs or InP/InGaAsP1 Adaptive algorithms for QCSE optical modulators Excitonic optical absorption at near band gap of the quantum well, the excitonic optical absorption strength and energy can be manipulated. This quantum

Levi, Anthony F. J.

106

September 1, 2001 / Vol. 26, No. 17 / OPTICS LETTERS 1335 Perturbation Monte Carlo methods to solve inverse photon  

E-Print Network (OSTI)

September 1, 2001 / Vol. 26, No. 17 / OPTICS LETTERS 1335 Perturbation Monte Carlo methods to solve with respect to perturbations in background tissue optical properties. We then feed this derivative information to a nonlinear optimization algorithm to determine the optical properties of the tissue heterogeneity under

Boas, David

107

E-Print Network 3.0 - advance photonics map Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

3 top of page Photonics.com: Optical, Laser and Fiber Optics Resource Summary: | Advertising | About Laurin | Site Map BU Photonics Center to Launch Nanophotonics Lab...

108

Spatially Multiplexed Fiber-optic Microscopy for Simultaneous Imaging of Multiple Brain Regions  

Science Journals Connector (OSTI)

Spatially multiplexed fiber-optic imager is experimentally demonstrated. Our system utilizes a trifurcated fiber bundles for real-time brain imaging in 3 different areas.

Cha, Jaepyeong; Kang, Jin U

109

Optical constants of materials in the EUV/soft x-ray region for multilayer mirror applications  

SciTech Connect

The response of a given material to an incident electromagnetic wave is described by the energy dependent complex index of refraction n = 1 {minus} {delta} + i{beta}. In the extreme ultraviolet (EUV)/soft x-ray spectral region, the need for accurate determination of n is driven by activity in areas such as synchrotron based research, EUV/x-ray lithography, x-ray astronomy and plasma applications. Knowledge of the refractive index is essential for the design of the optical components of instruments used in experiments and applications. Moreover, measured values of n may be used to evaluate solid state models for the optical behavior of materials. The refractive index n of Si, Mo and Be is investigated in the EUV/soft x-ray region. In the case of Si, angle dependent reflectance measurements are performed in the energy range 50--180 eV. The optical constants {delta}, {beta} are both determined by fitting to the Fresnel equations. The results of this method are compared to the values in the 1993 atomic tables. Photoabsorption measurements for the optical constants of Mo are performed on C/Mo/C foils, in the energy range 60--930 eV. Photoabsorption measurements on Be thin films supported on silicon nitride membranes are performed, and the results are applied in the determination of the absorption coefficient of Be in the energy region 111.5--250 eV. The new results for Si and Mo are applied to the calculation of normal incidence reflectivities of Mo/Si and Mo/Be multilayer mirrors. These calculations show the importance of accurate knowledge of {delta} and {beta} in the prediction and modeling of the performance of multilayer optics.

Soufli, R. [Univ. of California, Berkeley, CA (United States)]|[Lawrence Berkeley National Lab., CA (United States). Materials Sciences Div.

1997-12-01T23:59:59.000Z

110

Optical characterisation of 2D macroporous silicon photonic crystals with bandgaps around 3.5 and 1.3 lm  

E-Print Network (OSTI)

.3 lm J. Schilling a,*, A. Birner a,1 , F. Muller a , R.B. Wehrspohn a , R. Hillebrand a , U. Gosele was successfully downscaled from a pitch of 1.5 to 0.5 lm. Re¯ection measurements performed at these structures around k 1:3 lm. ? 2001 Elsevier Science B.V. All rights reserved. Keywords: Photonic crystal

Van Driel, Henry M.

111

Transfer and retrieval of optical coherence to strain-compensated quantum dots using a heterodyne photon-echo technique  

SciTech Connect

We performed the proof-of-principle demonstration of photon-echo quantum memory using strain-compensated InAs quantum dot ensemble in the telecommunication wavelength range. We succeeded in transfer and retrieval of relative phase of a time-bin pulse with a high fidelity. Our demonstration suggests the possibility of realizing ultrabroadband, high time-bandwidth products, multi-mode quantum memory which is operable at telecommunication wavelength.

Suzuki, Kazumasa; Ishi-Hayase, Junko [Department of Applied Physics and Physico-Informatics, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522 (Japan); Akahane, Kouichi; Yamamoto, Naokatsu [National Institute of Information and Communications Technology (NICT), 4-2-1, Nukuikitamchi, Koganei, Tokyo 102-8554 (Japan)

2013-12-04T23:59:59.000Z

112

High-index-contrast electromechanical optical switches  

E-Print Network (OSTI)

System developers are looking to replace protocol-dependent, bandwidth-limited optical networks with intelligent optically-transparent integrated photonic networks. Several electromechanical optical switches are explored ...

Bryant, Reginald (Reginald Eugene), 1978-

2011-01-01T23:59:59.000Z

113

BBGKY kinetic approach for an e{sup -}e{sup +}{gamma} plasma created from the vacuum in a strong laser-generated electric field: The one-photon annihilation channel  

SciTech Connect

In the present work a closed system of kinetic equations is obtained from the truncation of the Bogoliubov-Born-Green-Kirkwood-Yvon hierarchy for the description of the vacuum creation of an electron-positron plasma and secondary photons due to a strong laser field. This truncation is performed in the Markovian approximation for the one-photon annihilation channel which is accessible due to the presence of the strong external field. Estimates of the photon production rate are obtained for different domains of laser field parameters (frequency {nu} and field strength E). A huge quantity of optical photons of the quasiclassical laser field is necessary to satisfy the conservation laws of the energy and momentum of the constituents (e{sup -}, e{sup +} and {gamma}) in this channel. Since the number of these optical photons corresponds to the order of perturbation theory, a vanishingly small photon production rate results for the optical region and strongly subcritical fields E<region {nu} < or approx. m the required number of laser photons is small and the production rate of photons from the one-photon annihilation process becomes accessible to observations for subcritical fields E < or approx. E{sub c}. In the infrared region the photon distribution has a 1/k spectrum typical for flicker noise.

Blaschke, D. B. [Institute for Theoretical Physics, University of Wroclaw, 50-204 Wroclaw (Poland); Bogoliubov Laboratory for Theoretical Physics, Joint Institute for Nuclear Research, RU - 141980 Dubna (Russian Federation); Dmitriev, V. V.; Smolyansky, S. A. [Department of Physics, Saratov State University, RU - 410026 Saratov (Russian Federation); Roepke, G. [Institut fuer Physik, University of Rostock, D - 18051 Rostock (Germany)

2011-10-15T23:59:59.000Z

114

Hidden Photons from the Sun  

E-Print Network (OSTI)

A brief account of the phenomenon of photon oscillations into sub-eV mass hidden photons is given and used to estimate the flux and properties of these hypothetical particles from the Sun. A new generation of dedicated helioscopes, the Solar Hidden Photon Search (SHIPS) in the Hamburg Observatory amongst them, will cover a vast region of parameter space.

Davide Cadamuro; Javier Redondo

2010-10-22T23:59:59.000Z

115

Photon detectors  

SciTech Connect

J. Seguinot and T. Ypsilantis have recently described the theory and history of Ring Imaging Cherenkov (RICH) detectors. In this paper, I will expand on these excellent review papers, by covering the various photon detector designs in greater detail, and by including discussion of mistakes made, and detector problems encountered, along the way. Photon detectors are among the most difficult devices used in physics experiments, because they must achieve high efficiency for photon transport and for the detection of single photo-electrons. For gaseous devices, this requires the correct choice of gas gain in order to prevent breakdown and wire aging, together with the use of low noise electronics having the maximum possible amplification. In addition, the detector must be constructed of materials which resist corrosion due to photosensitive materials such as, the detector enclosure must be tightly sealed in order to prevent oxygen leaks, etc. The most critical step is the selection of the photocathode material. Typically, a choice must be made between a solid (CsI) or gaseous photocathode (TMAE, TEA). A conservative approach favors a gaseous photocathode, since it is continuously being replaced by flushing, and permits the photon detectors to be easily serviced (the air sensitive photocathode can be removed at any time). In addition, it can be argued that we now know how to handle TMAE, which, as is generally accepted, is the best photocathode material available as far as quantum efficiency is concerned. However, it is a very fragile molecule, and therefore its use may result in relatively fast wire aging. A possible alternative is TEA, which, in the early days, was rejected because it requires expensive CaF{sub 2} windows, which could be contaminated easily in the region of 8.3 eV and thus lose their UV transmission.

Va`vra, J.

1995-10-01T23:59:59.000Z

116

Ion photon emission microscope  

DOE Patents (OSTI)

An ion beam analysis system that creates microscopic multidimensional image maps of the effects of high energy ions from an unfocussed source upon a sample by correlating the exact entry point of an ion into a sample by projection imaging of the ion-induced photons emitted at that point with a signal from a detector that measures the interaction of that ion within the sample. The emitted photons are collected in the lens system of a conventional optical microscope, and projected on the image plane of a high resolution single photon position sensitive detector. Position signals from this photon detector are then correlated in time with electrical effects, including the malfunction of digital circuits, detected within the sample that were caused by the individual ion that created these photons initially.

Doyle, Barney L. (Albuquerque, NM)

2003-04-22T23:59:59.000Z

117

Photon Science  

NLE Websites -- All DOE Office Websites (Extended Search)

Photon Science Along with its primary missions-global security, energy security, basic science, and national competitiveness-the NIF & Photon Science Directorate also pursues...

118

Optical  

NLE Websites -- All DOE Office Websites (Extended Search)

Optical Optical fiber-based single-shot picosecond transient absorption spectroscopy Andrew R. Cook a͒ and Yuzhen Shen Department of Chemistry, Brookhaven National Laboratory, Upton, New York 11973, USA ͑Received 27 January 2009; accepted 29 May 2009; published online 17 July 2009͒ A new type of single-shot transient absorption apparatus is described based on a bundle of optical fibers. The bundle contains 100 fibers of different lengths, each successively giving ϳ15 ps longer optical delay. Data are collected by imaging light from the exit of the bundle into a sample where it is overlapped with an electron pulse or laser excitation pulse, followed by imaging onto a charge coupled device ͑CCD͒ detector where the intensity of light from each fiber is measured simultaneously. Application to both ultrafast pump-probe spectroscopy and pulse radiolysis is demonstrated. For pulse

119

Optics  

Science Journals Connector (OSTI)

Optical components such as lenses, mirrors and diffraction gratings are widely used in many inspection systems. These include not only those for visual inspection with CCD cameras, but also in areas of distanc...

C. Loughlin

1993-01-01T23:59:59.000Z

120

The Dirac Point of Photonic Graphene  

Science Journals Connector (OSTI)

Photonic graphene is an optical analogue to electronic graphene. We introduce Dirac maps to design a structure of alumina rods and experimentally demonstrate the existence of an Dirac...

de Dood, Michiel J

Note: This page contains sample records for the topic "regional optics photonics" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


121

Photonic Sensing Technology in the Energy Sector  

Science Journals Connector (OSTI)

A review of photonic sensing technologies based on spectroscopic, fiber optics, and LIDAR technologies used in energy sector for measurement and monitoring applications in wind, oil...

Mendez, Alexis

122

Preserving photon qubits in an unknown quantum state with Knill Dynamical Decoupling - Towards an all optical quantum memory  

E-Print Network (OSTI)

The implementation of polarization-based quantum communication is limited by signal loss and decoherence caused by the birefringence of a single-mode fiber. We investigate the Knill dynamical decoupling scheme, implemented using half-wave plates, to minimize decoherence and show that a fidelity greater than $99\\%$ can be achieved in absence of rotation error and fidelity greater than $96\\%$ can be achieved in presence of rotation error. Such a scheme can be used to preserve any quantum state with high fidelity and has potential application for constructing all optical quantum delay line, quantum memory, and quantum repeater.

Manish K. Gupta; Erik J. Navarro; Todd A. Moulder; Jason D. Mueller; Ashkan Balouchi; Katherine L. Brown; Hwang Lee; Jonathan P. Dowling

2014-12-19T23:59:59.000Z

123

THE STRUCTURE OF THE X-RAY AND OPTICAL EMITTING REGIONS OF THE LENSED QUASAR Q 2237+0305  

SciTech Connect

We use gravitational microlensing to determine the size of the X-ray and optical emission regions of the quadruple lens system Q 2237+0305. The optical half-light radius, log(R{sub 1/2,V}/cm) = 16.41 {+-} 0.18 (at {lambda}{sub rest} = 2018 A), is significantly larger than the observed soft, log(R{sub 1/2,soft}/cm)=15.76{sup +0.41}{sub -0.34} (1.1-3.5 keV in the rest frame), and hard, log(R{sub 1/2,hard}/cm)=15.46{sup +0.34}{sub -0.29} (3.5-21.5 keV in the rest frame), band X-ray emission. There is weak evidence that the hard component is more compact than the soft, with log(R{sub 1/2,soft}/R{sub 1/2,hard}){approx_equal}0.30{sup +0.53}{sub -0.45}. This wavelength-dependent structure agrees with recent results found in other lens systems using microlensing techniques, and favors geometries in which the corona is concentrated near the inner edge of the accretion disk. While the available measurements are limited, the size of the X-ray emission region appears to be roughly proportional to the mass of the central black hole.

Mosquera, A. M.; Kochanek, C. S.; Blackburne, J. A. [Department of Astronomy, Ohio State University, 140 West 18th Avenue, Columbus, OH 43210 (United States); Chen, B.; Dai, X. [Homer L. Dodge Department of Physics and Astronomy, University of Oklahoma, Norman, OK 73019 (United States); Chartas, G. [Department of Physics and Astronomy, College of Charleston, Charleston, SC 29424 (United States)

2013-05-20T23:59:59.000Z

124

Supersonic metal plasma impact on a surface: An optical investigation of the pre-surface region  

SciTech Connect

Aluminum plasma, produced in high vacuum by a pulsed, filtered cathodic arc plasma source, was directed onto a wall where if formed a coating. The accompanying ?optical flare? known from the literature was visually observed, photographed, and spectroscopically investigated with appropriately high temporal (1 ?s) and spatial (100 ?m) resolution. Consistent with other observations using different techniques, it was found that the impact of the fully ionized plasma produces metal neutrals as well as desorbed gases, both of which interact with the incoming plasma. Most effectively are charge exchange collisions between doubly charged aluminum and neutral aluminum, which lead to a reduction of the flow of doubly charged before they reach the wall, and a reduction of neutrals as the move away from the surface. Those plasma-wall interactions are relevant for coating processes as well as for interpreting the plasma properties such as ion charge state distributions.

Fusion Science Group, AFRD; Plasma Applications Group, AFRD; Ni, Pavel A.; Anders, Andre

2009-12-15T23:59:59.000Z

125

Optical Packet Switching -1 Optical Networks  

E-Print Network (OSTI)

Optical Packet Switching - 1 Optical Networks: from fiber transmission to photonic switching Optical Packet Switching Fabio Neri and Marco Mellia TLC Networks Group ­ Electronics Department e.mellia@polito.it ­ tel. 011 564 4173 #12;Optical Packet Switching - 2 · This work is licensed under the Creative Commons

Mellia, Marco

126

Field Quantization, Photons and Non-Hermitean Modes  

E-Print Network (OSTI)

Field quantization in three dimensional unstable optical systems is treated by expanding the vector potential in terms of non-Hermitean (Fox-Li) modes in both the cavity and external regions. The cavity non-Hermitean modes (NHM) are treated using the paraxial and monochromaticity approximations. The NHM bi-orthogonality relationships are used in a standard canonical quantization procedure based on introducing generalised coordinates and momenta for the electromagnetic (EM) field. The quantum EM field is equivalent to a set of quantum harmonic oscillators (QHO), associated with either the cavity or the external region NHM. This confirms the validity of the photon model in unstable optical systems, though the annihilation and creation operators for each QHO are not Hermitean adjoints. The quantum Hamiltonian for the EM field is the sum of non-commuting cavity and external region contributions, each of which is sum of independent QHO Hamiltonians for each NHM, but the external field Hamiltonian also includes a coupling term responsible for external NHM photon exchange processes. Cavity energy gain and loss processes is associated with the non-commutativity of cavity and external region operators, given in terms of surface integrals involving cavity and external region NHM functions on the cavity-external region boundary. The spontaneous decay of a two-level atom inside an unstable cavity is treated using the essential states approach and the rotating wave approximation. Atomic transitions leading to cavity NHM photon absorption have a different coupling constant to those leading to photon emission, a feature resulting from the use of NHM functions. Under certain conditions the decay rate is enhanced by the Petermann factor.

S. A. Brown; B. J. Dalton

2001-09-10T23:59:59.000Z

127

Quantum Enabled Security (QES) for Optical Communications  

NLE Websites -- All DOE Office Websites (Extended Search)

integrated with optical communications to provide a strong, innate, security foundation at the photonic layer for optical fiber networks. July 10, 2013 Quantum Enabled...

128

Bandwidth optimization of single-polarization single-mode photonic  

E-Print Network (OSTI)

is applied to optimize the cladding and core structures of SPSM photonic crystal fibers. We present several.L. Santos, F.M. Ara´ujo, and L.A. Ferreira. Optical sensing with photonic crystal fibers. Laser & Photonics cladding. Optics letters, 21(19):1547­1549, 1996. #12;11. M. Koshiba, S. Maruyama, and K. Hirayama

Freund, Robert M.

129

Two-Photon Emission from Semiconductors  

E-Print Network (OSTI)

We report the first experimental observations of two-photon emission from semiconductors, to the best of our knowledge, and develop a corresponding theory for the room-temperature process. Spontaneous two-photon emission is demonstrated in optically-pumped bulk GaAs and in electrically-driven GaInP/AlGaInP quantum wells. Singly-stimulated two-photon emission measurements demonstrate the theoretically predicted two-photon optical gain in semiconductors - a necessary ingredient for any realizations of future two-photon semiconductor lasers. Photon-coincidence experiment validates the simultaneity of the electrically-driven GaInP/AlGaInP two-photon emission, limited only by detector's temporal resolution.

Alex Hayat; Pavel Ginzburg; Meir Orenstein

2007-10-25T23:59:59.000Z

130

Room temperature broadband coherent terahertz emission induced by dynamical photon drag in graphene  

E-Print Network (OSTI)

Nonlinear couplings between photons and electrons in new materials give rise to a wealth of interesting nonlinear phenomena. This includes frequency mixing, optical rectification or nonlinear current generation, which are of particular interest for generating radiation in spectral regions that are difficult to access, such as the terahertz gap. Owing to its specific linear dispersion and high electron mobility at room temperature, graphene is particularly attractive for realizing strong nonlinear effects. However, since graphene is a centrosymmetric material, second-order nonlinearities a priori cancel, which imposes to rely on less attractive third-order nonlinearities. It was nevertheless recently demonstrated that dc-second-order nonlinear currents as well as ultrafast ac-currents can be generated in graphene under optical excitation. The asymmetry is introduced by the excitation at oblique incidence, resulting in the transfer of photon momentum to the electron system, known as the photon drag effect. Here...

Maysonnave, J; Wang, F; Maero, S; Berger, C; de Heer, W; Norris, T B; De Vaulchier, L A; Dhillon, S; Tignon, J; Ferreira, R; Mangeney, J

2015-01-01T23:59:59.000Z

131

Controlling the quantum state of a single photon emitted from a single polariton  

SciTech Connect

We investigate in detail the optimal conditions for a high fidelity transfer from a single-polariton state to a single-photon state and subsequent homodyne detection of the single photon. We assume that, using various possible techniques, the single polariton has initially been stored as a spin-wave grating in a cloud of cold atoms inside a low-finesse cavity. This state is then transferred to a single-photon optical pulse using an auxiliary beam. We optimize the retrieval efficiency and determine the mode of the local oscillator that maximizes the homodyne efficiency of such a photon. We find that both efficiencies can have values close to one in a large region of experimental parameters.

Stanojevic, Jovica; Parigi, Valentina; Bimbard, Erwan; Tualle-Brouri, Rosa; Ourjoumtsev, Alexei; Grangier, Philippe [Laboratoire Charles Fabry, Institut d'Optique, CNRS, Universite Paris-Sud, Campus Polytechnique, RD 128, FR-91127 Palaiseau cedex (France)

2011-11-15T23:59:59.000Z

132

Spontaneous Photon Emission in Cavities  

E-Print Network (OSTI)

We investigate spontaneous photon emission processes of two-level atoms in parabolic and ellipsoidal cavities thereby taking into account the full multimode scenario. In particular, we calculate the excitation probabilities of the atoms and the energy density of the resulting few-photon electromagnetic radiation field by using semiclassical methods for the description of the multimode scenario. Based on this approach photon path representations are developed for relevant transition probability amplitudes which are valid in the optical frequency regime where the dipole and the rotating-wave approximations apply. Comparisons with numerical results demonstrate the quality of these semiclassical results even in cases in which the wave length of a spontaneously emitted photon becomes comparable or even larger than characteristic length scales of the cavity. This is the dynamical regime in which diffraction effects become important so that geometric optical considerations are typically not applicable.

Gernot Alber; Nils Trautmann

2014-12-04T23:59:59.000Z

133

The Sun in Hidden Photons  

E-Print Network (OSTI)

We present some aspects and first results of the emission of sub-eV mass hidden photons from the Sun. The contribution from a resonant region below the photosphere can be quite significant, raising previous estimates. This is relevant for the Telescope for Hidden Photon Search, TSHIPS I, currently targeting at meV-mass hidden photons with O(10^-6) kinetic mixing with the photon. These particles could account for the large effective number of neutrinos pointed at by the cosmic microwave background and other large-scale structure probes, and are motivated in some scenarios of string theory.

Javier Redondo

2012-02-22T23:59:59.000Z

134

Nuclear photonics  

SciTech Connect

With the planned new {gamma}-beam facilities like MEGa-ray at LLNL (USA) or ELI-NP at Bucharest (Romania) with 10{sup 13}{gamma}/s and a band width of {Delta}E{gamma}/E{gamma} Almost-Equal-To 10{sup -3}, a new era of {gamma} beams with energies up to 20MeV comes into operation, compared to the present world-leading HI{gamma}S facility at Duke University (USA) with 10{sup 8}{gamma}/s and {Delta}E{gamma}/E{gamma} Almost-Equal-To 3 Dot-Operator 10{sup -2}. In the long run even a seeded quantum FEL for {gamma} beams may become possible, with much higher brilliance and spectral flux. At the same time new exciting possibilities open up for focused {gamma} beams. Here we describe a new experiment at the {gamma} beam of the ILL reactor (Grenoble, France), where we observed for the first time that the index of refraction for {gamma} beams is determined by virtual pair creation. Using a combination of refractive and reflective optics, efficient monochromators for {gamma} beams are being developed. Thus, we have to optimize the total system: the {gamma}-beam facility, the {gamma}-beam optics and {gamma} detectors. We can trade {gamma} intensity for band width, going down to {Delta}E{gamma}/E{gamma} Almost-Equal-To 10{sup -6} and address individual nuclear levels. The term 'nuclear photonics' stresses the importance of nuclear applications. We can address with {gamma}-beams individual nuclear isotopes and not just elements like with X-ray beams. Compared to X rays, {gamma} beams can penetrate much deeper into big samples like radioactive waste barrels, motors or batteries. We can perform tomography and microscopy studies by focusing down to {mu}m resolution using Nuclear Resonance Fluorescence (NRF) for detection with eV resolution and high spatial resolution at the same time. We discuss the dominating M1 and E1 excitations like the scissors mode, two-phonon quadrupole octupole excitations, pygmy dipole excitations or giant dipole excitations under the new facet of applications. We find many new applications in biomedicine, green energy, radioactive waste management or homeland security. Also more brilliant secondary beams of neutrons and positrons can be produced.

Habs, D.; Guenther, M. M.; Jentschel, M.; Thirolf, P. G. [Ludwig-Maximilians-Universitaet Muenchen, D-85748 Garching (Germany); Max Planck Institut fuer Quantenoptik, D-85748 Garching (Germany); Institut Laue-Langevin, F-38042 Grenoble (Germany); Ludwig-Maximilians-Universitaet Muenchen, D-85748 Garching (Germany)

2012-07-09T23:59:59.000Z

135

AN INTRODUCTION TO QUANTUM OPTICS...  

E-Print Network (OSTI)

AN INTRODUCTION TO QUANTUM OPTICS... ...the light as you've never seen before... Optics:http://science.howstuffworks.com/laser5.htm #12;5 DEFINITION Quantum Optics: "Quantum optics is a field in quantum physics, dealing OPTICS OPERATORS Light is described in terms of field operators for creation and annihilation of photons

Palffy-Muhoray, Peter

136

FY 2006 Infrared Photonics Final Report  

SciTech Connect

Research done by the Infrared Photonics team at Pacific Northwest National Laboratory (PNNL) is focused on developing miniaturized integrated optics and optical fiber processing methods for mid-wave infrared (MWIR) and long-wave infrared (LWIR) sensing applications by exploiting the unique optical and material properties of chalcogenide glass. PNNL has developed thin-film deposition capabilities, direct laser writing techniques, infrared photonic device demonstration, holographic optical element design and fabrication, photonic device modeling, and advanced optical metrologyall specific to chalcogenide glass. Chalcogenide infrared photonics provides a pathway to quantum cascade laser (QCL) transmitter miniaturization. The high output power, small size, and superb stability and modulation characteristics of QCLs make them amenable for integration as transmitters into ultra-sensitive, ultra-selective point sampling and remote short-range chemical sensors that are particularly useful for nuclear nonproliferation missions.

Anheier, Norman C.; Allen, Paul J.; Bernacki, Bruce E.; Ho, Nicolas; Krishnaswami, Kannan; Qiao, Hong (Amy); Schultz, John F.

2006-12-28T23:59:59.000Z

137

Optical imaging of Rydberg atoms .  

E-Print Network (OSTI)

??We present an experiment exploring electromagnetically induced transparency (EIT) in Rydberg atoms in order to observe optical nonlinearities at the single photon level. ??Rb atoms (more)

Mazurenko, Anton

2012-01-01T23:59:59.000Z

138

Measurement of g-factors of ground and excited optical states of Er3+ in YLiF4 and LuLiF4 in zero dc magnetic field by photon echo method  

E-Print Network (OSTI)

New scheme of definition of g-factors as ground as excited optical states of a paramagnetic ion in zero external constant magnetic field has been proposed and experimentally realized in optical systems in which Zeeman Effect is manifested. A pulse of a weak magnetic field leads to occurrence of relative phase shifts of the excited dipoles and, as consequence, to modulation of a photon echo waveform if magnetic pulse (MP) overlaps in time with echo-pulse. The modulation periods of the waveform depend on polarization of the laser light, which excites the photon echo. The values of these periods for {\\sigma}- and {\\pi}- laser light polarization have been measured and then the g-factors of the ground 4I15/2 and excited 4F9/2 states of the Er3+ ion in the LuLiF4 and the YLiF4 matrices have been determined. Values of the g-factors have been compared with the known literary data.

Lisin, V N; Samartsev, V V

2014-01-01T23:59:59.000Z

139

Methods and systems for Raman and optical cross-interrogation in flow-through silicon membranes  

DOE Patents (OSTI)

Cross-interrogating photonic detection systems and methods are shown. A flow through photonic crystal membrane with a surface enhanced Raman scattering (SERS) substrate is provided with pores which are distributed along multiple regions. The pores of one region have walls to which a first type of target specific anchor can be attached, while pores of another region have walls to which a second type of target specific anchor can be attached. An optical arrangement out-of-plane to the SERS substrate is also provided for enhanced sensitivity and identification of target organisms.

Bond, Tiziana C.; Letant, Sonia E.

2014-09-09T23:59:59.000Z

140

Method for Creating Photonic Band Gap Materials - Energy Innovation...  

NLE Websites -- All DOE Office Websites (Extended Search)

a photonic band gap. These microstructures have the potential to change the way optoelectronic devices, such as photodiodes, LEDs, and integrated optical circuit elements, are...

Note: This page contains sample records for the topic "regional optics photonics" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


141

Control of Light Speed in Photonic Crystal Waveguide Devices  

Science Journals Connector (OSTI)

Optical buffering and nonlinear enhancement is demonstrated using slow light in photonic crystal waveguide devices. Nearly 350 ps delay and tunability are obtained in a narrowband...

Baba, Toshihiko; Adachi, Jun; Ishikura, Norihiro; Hamachi, Yohei; Saito, Yuji

142

OPTICS5  

NLE Websites -- All DOE Office Websites (Extended Search)

Optics5 (5.1.02) Knowledge Base Optics5 (5.1.02) Knowledge Base Last Updated: 09/11/13 Table of Contents INSTALLATION EXECUTION bullet ** Operating Systems -- Microsoft Windows 7 and Vista ** bullet ** Running Optics5 with Microsoft Windows 7 and Vista ** bullet ** Running Optics5 with Microsoft Windows 7 and Vista 64 bit ** Optics5 may not work correctly with regional/locale settings using "," as a decimal separator. bullet Which Windows operating systems can be used to run Optics? "Class Does Not Support Automation or Expected Interface" error message bullet How much hard disk space should be available to install Optics? Optics user manual bullet I receive a virus warning (nimda-virus) when installing Optics. What should I do? NFRC Procedure for Applied Films bullet I have installed Optics but I can't find the program or the icon.

143

Optical imaging of Rydberg atoms  

E-Print Network (OSTI)

We present an experiment exploring electromagnetically induced transparency (EIT) in Rydberg atoms in order to observe optical nonlinearities at the single photon level. ??Rb atoms are trapped and cooled using a magneto-optical ...

Mazurenko, Anton

2012-01-01T23:59:59.000Z

144

Heralded single-photon partial coherence  

Science Journals Connector (OSTI)

We study transverse spatial coherence of approximately localized single-photon states. We demonstrate nonlocal control over single-photon spatial coherence via projective measurements of an entangled twin and provide a theoretical interpretation from quantum coherence theory. Our results show that the spatial coherence of a single-photon state behaves similarly to that of a classical optical field, although the coincidence measurement adds a degree of freedom.

P. Ben Dixon; Gregory Howland; Mehul Malik; David J. Starling; R. W. Boyd; John C. Howell

2010-08-02T23:59:59.000Z

145

Heralded single-photon partial coherence  

SciTech Connect

We study transverse spatial coherence of approximately localized single-photon states. We demonstrate nonlocal control over single-photon spatial coherence via projective measurements of an entangled twin and provide a theoretical interpretation from quantum coherence theory. Our results show that the spatial coherence of a single-photon state behaves similarly to that of a classical optical field, although the coincidence measurement adds a degree of freedom.

Dixon, P. Ben; Howland, Gregory; Starling, David J.; Howell, John C. [Department of Physics and Astronomy, University of Rochester, Rochester, New York 14627 (United States); Malik, Mehul [Institute of Optics, University of Rochester, Rochester, New York 14627 (United States); Boyd, R. W. [Department of Physics and Astronomy, University of Rochester, Rochester, New York 14627 (United States); Institute of Optics, University of Rochester, Rochester, New York 14627 (United States)

2010-08-15T23:59:59.000Z

146

Fiber to waveguide couplers for silicon photonics  

E-Print Network (OSTI)

As silicon photonics enters mainstream technology, we find ourselves in need of methods to seamlessly transfer light between the optical fibers of global scale telecommunications networks and the on-chip waveguides used ...

Montalbo, Trisha M., 1980-

2004-01-01T23:59:59.000Z

147

High index contrast platform for silicon photonics  

E-Print Network (OSTI)

This thesis focuses on silicon-based high index contrast (HIC) photonics. In addition to mature fiber optics or low index contrast (LIC) platform, which is often referred to as Planar Lightwave Cirrcuit (PLC) or Silica ...

Akiyama, Shoji, 1972-

2004-01-01T23:59:59.000Z

148

Photon generator  

DOE Patents (OSTI)

A photon generator includes an electron gun for emitting an electron beam, a laser for emitting a laser beam, and an interaction ring wherein the laser beam repetitively collides with the electron beam for emitting a high energy photon beam therefrom in the exemplary form of x-rays. The interaction ring is a closed loop, sized and configured for circulating the electron beam with a period substantially equal to the period of the laser beam pulses for effecting repetitive collisions.

Srinivasan-Rao, Triveni (Shoreham, NY)

2002-01-01T23:59:59.000Z

149

A photonic cluster state machine gun  

E-Print Network (OSTI)

We present a method to convert certain single photon sources into devices capable of emitting large strings of photonic cluster state in a controlled and pulsed "on demand" manner. Such sources would greatly reduce the resources required to achieve linear optical quantum computation. Standard spin errors, such as dephasing, are shown to affect only 1 or 2 of the emitted photons at a time. This allows for the use of standard fault tolerance techniques, and shows that the photonic machine gun can be fired for arbitrarily long times. Using realistic parameters for current quantum dot sources, we conclude high entangled-photon emission rates are achievable, with Pauli-error rates per photon of less than 0.2%. For quantum dot sources the method has the added advantage of alleviating the problematic issues of obtaining identical photons from independent, non-identical quantum dots, and of exciton dephasing.

Netanel H. Lindner; Terry Rudolph

2008-10-15T23:59:59.000Z

150

Photon-pair generation in photonic crystal fibrebre with a 1.5GHz modelocked VECSEL  

E-Print Network (OSTI)

Four-wave mixing (FWM) in optical fibre is a leading technique for generating high-quality photon pairs. We report the generation of photon pairs by spontaneous FWM in photonic crystal fibre pumped by a 1.5 GHz repetition-rate vertical-external-cavity surface-emitting laser (VECSEL). The photon pairs exhibit high count rates and a coincidence-to-accidental ratio of over 80. The VECSEL's high repetition-rate, high average power, tunability, and small footprint make this an attractive source for quantum key distribution and photonic quantum-state engineering.

Oliver J. Morris; Robert J. A. Francis-Jones; Keith G. Wilcox; Anne C. Tropper; Peter J. Mosley

2014-09-09T23:59:59.000Z

151

Optical Quantum Computing  

E-Print Network (OSTI)

In 2001 all-optical quantum computing became feasible with the discovery that scalable quantum computing is possible using only single photon sources, linear optical elements, and single photon detectors. Although it was in principle scalable, the massive resource overhead made the scheme practically daunting. However, several simplifications were followed by proof-of-principle demonstrations, and recent approaches based on cluster states or error encoding have dramatically reduced this worrying resource overhead, making an all-optical architecture a serious contender for the ultimate goal of a large-scale quantum computer. Key challenges will be the realization of high-efficiency sources of indistinguishable single photons, low-loss, scalable optical circuits, high efficiency single photon detectors, and low-loss interfacing of these components.

Jeremy L. O'Brien

2008-03-11T23:59:59.000Z

152

Fast Generators of Direct Photons  

E-Print Network (OSTI)

Three fast generators of direct photons in the central rapidity region of high-energy heavy-ion collisions have been presented The generator of prompt photons is based on a tabulation of $p+p(\\bar p)$ data and binary scaling. Two generators of thermal direct photons, for hot hadron gas (HHG) and quark-gluon plasma (QGP) scenarios, assume the 1+1 Bjorken hydrodynamics. SPS and RHIC data can be fitted better by scenario with QGP. Predictions for the LHC energy have been made. The generators have been realized as macros for the ROOT analysis package.

S. M. Kiselev

2008-11-17T23:59:59.000Z

153

Self-frequency summing in quantum dot photonic crystal nanocavity lasers  

SciTech Connect

We demonstrate self-frequency summing in photonic crystal nanocavity lasers with quantum dot gain. Two dipole modes and a hexapole mode, supported in the cavity, simultaneously showed lasing oscillation in the near infrared wavelength region under optical carrier injection. Meanwhile, within the same laser cavity, the internally generated three laser fields are up-converted to exhibit sharp visible emission lines via intra-cavity nonlinear frequency summing (and doubling) processes. This self-frequency summing process in active nanocavities will pave the way for developing nanoscale nonlinear optical light sources.

Ota, Yasutomo; Watanabe, Katsuyuki [Institute for Nano Quantum Information Electronics, University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505 (Japan)] [Institute for Nano Quantum Information Electronics, University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505 (Japan); Iwamoto, Satoshi; Arakawa, Yasuhiko [Institute for Nano Quantum Information Electronics, University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505 (Japan) [Institute for Nano Quantum Information Electronics, University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505 (Japan); Institute of Industrial Science, University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8904 (Japan)

2013-12-09T23:59:59.000Z

154

FY 2005 Infrared Photonics Final Report  

SciTech Connect

Research done by the Infrared Photonics team at Pacific Northwest National Laboratory (PNNL) is focused on developing miniaturized integrated optics for mid-wave infrared (MWIR) and long-wave infrared (LWIR) sensing applications by exploiting the unique optical and material properties of chalcogenide glass. PNNL has developed thin-film deposition capabilities, direct laser writing techniques, infrared photonic device demonstration, holographic optical element design and fabrication, photonic device modeling, and advanced optical metrologyall specific to chalcogenide glass. Chalcogenide infrared photonics provides a pathway to quantum cascade laser (QCL) transmitter miniaturization. QCLs provide a viable infrared laser source for a new class of laser transmitters capable of meeting the performance requirements for a variety of national security sensing applications. The high output power, small size, and superb stability and modulation characteristics of QCLs make them amenable for integration as transmitters into ultra-sensitive, ultra-selective point sampling and remote short-range chemical sensors that are particularly useful for nuclear nonproliferation missions. During FY 2005, PNNLs Infrared Photonics research team made measurable progress exploiting the extraordinary optical and material properties of chalcogenide glass to develop miniaturized integrated optics for mid-wave infrared (MWIR) and long-wave infrared (LWIR) sensing applications. We investigated sulfur purification methods that will eventually lead to routine production of optical quality chalcogenide glass. We also discovered a glass degradation phenomenon and our investigation uncovered the underlying surface chemistry mechanism and developed mitigation actions. Key research was performed to understand and control the photomodification properties. This research was then used to demonstrate several essential infrared photonic devices, including LWIR single-mode waveguide devices and waveguide couplers. Optical metrology tools were also developed to characterize optical waveguide structures and LWIR optical components.

Anheier, Norman C.; Allen, Paul J.; Ho, Nicolas; Krishnaswami, Kannan; Johnson, Bradley R.; Sundaram, S. K.; Riley, Bradley M.; Martinez, James E.; Qiao, Hong (Amy); Schultz, John F.

2005-12-01T23:59:59.000Z

155

Tunable negative-tap photonic microwave filter based on a  

E-Print Network (OSTI)

Tunable negative-tap photonic microwave filter based on a cladding-mode coupler and an optically injected laser of large detuning Sze-Chun Chan,* Qing Liu, Zhu Wang, and Kin Seng Chiang Department: A tunable negative-tap photonic microwave filter using a cladding-mode coupler together with optical

Chan, Sze-Chun

156

Nonlinear interaction between two heralded single photons  

E-Print Network (OSTI)

Harnessing nonlinearities strong enough to allow two single photons to interact with one another is not only a fascinating challenge but is central to numerous advanced applications in quantum information science. Currently, all known approaches are extremely challenging although a few have led to experimental realisations with attenuated classical laser light. This has included cross-phase modulation with weak classical light in atomic ensembles and optical fibres, converting incident laser light into a non-classical stream of photon or Rydberg blockades as well as all-optical switches with attenuated classical light in various atomic systems. Here we report the observation of a nonlinear parametric interaction between two true single photons. Single photons are initially generated by heralding one photon from each of two independent spontaneous parametric downconversion sources. The two heralded single photons are subsequently combined in a nonlinear waveguide where they are converted into a single photon with a higher energy. Our approach highlights the potential for quantum nonlinear optics with integrated devices, and as the photons are at telecom wavelengths, it is well adapted to applications in quantum communication.

T. Guerreiro; A. Martin; B. Sanguinetti; J. S. Pelc; C. Langrock; M. M. Fejer; N. Gisin; H. Zbinden; N. Sangouard; R. T. Thew

2014-03-09T23:59:59.000Z

157

Photon Energy Services Photon | Open Energy Information  

Open Energy Info (EERE)

Services Photon Services Photon Jump to: navigation, search Name Photon Energy Services (Photon) Place Los Altos, California Zip 94022 Sector Solar Product California-based firm that enables companies and government entities to go solar by managing the design and implementation of the solar PV system as well as the provision of maintenance. References Photon Energy Services (Photon)[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. Photon Energy Services (Photon) is a company located in Los Altos, California . References ↑ "Photon Energy Services (Photon)" Retrieved from "http://en.openei.org/w/index.php?title=Photon_Energy_Services_Photon&oldid=349726"

158

Verification of Patch- and Regional-Scale Energy Balance Estimates Derived from Microwave and Optical Remote Sensing during SGP97  

Science Journals Connector (OSTI)

The 1997 Southern Great Plains Hydrology Experiment (SGP97) was designed and conducted to extend surface soil moisture retrieval algorithms based on passive microwave observations to coarser resolutions, larger regions with more diverse ...

William P. Kustas; Thomas J. Jackson; Andrew N. French; J. Ian MacPherson

2001-06-01T23:59:59.000Z

159

800 IEEE PHOTONICS TECHNOLOGY LETTERS, VOL. 20, NO. 10, MAY 15, 2008 One-Level Simplification Method for All-Optical  

E-Print Network (OSTI)

system where two successive values differ by only one digit) to a 4-bit binary coded decimal (BCD code to binary coded decimal converter is successfully developed for the first time by using-optical 1LSM, we numerically demonstrate the successful operation of a 4-bit gray code (bi- nary numeral

Park, Namkyoo

160

Nonlinear-optical processes in the near-resonant two-photon excitation of xenon by femtosecond KrF-excimer-laser pulses  

Science Journals Connector (OSTI)

The nonlinear response of xenon gas due to a near-resonant two-photon excitation at the 5p6 1S0?6p[1/2]0 transition with a femtosecond KrF-excimer-laser system is investigated for the intensity range 10101015 W/cm2. Stimulated hyper-Raman scattering and amplified spontaneous emission of atomic xenon are observed at wavelengths around 823 and 828 nm. These emissions are superimposed by four-wave parametric-oscillation processes leading to strong ultrashort continuum radiation in the visible and near-infrared (650850 nm), uv (185400 nm), and vacuum ultraviolet (147155 nm) spectral ranges with output powers up to 100 MW. From difference-frequency-mixing experiments microscopic nonlinear susceptibilities in the range of ??(3)?=10-48 to 10-50 m5/V2 have been determined, which are in good agreement with calculations.

A. Tnnermann; K. Mossavi; B. Wellegehausen

1992-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "regional optics photonics" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


161

International Society for Optical Engineering (SPIE) Fellows  

NLE Websites -- All DOE Office Websites (Extended Search)

SPIE recognizes accomplishments and meritorious service in the optics, photonics, optoelectronics, and imaging communities it serves. Fellows are members of distinction who have...

162

Quantum Enabled Security (QES) for Optical Communications  

NLE Websites -- All DOE Office Websites (Extended Search)

Quantum Enabled Security (QES) for Optical Communications Quantum Enabled Security (QES) for Optical Communications Quantum Enabled Security (QES) for Optical Communications Los Alamos National Laboratory has developed Quantum Enabled Security (QES), a revolutionary new cybersecurity capability using quantum (single-photon) communications integrated with optical communications to provide a strong, innate, security foundation at the photonic layer for optical fiber networks. July 10, 2013 Quantum Enabled Security (QES) for Optical Communications Available for thumbnail of Feynman Center (505) 665-9090 Email Quantum Enabled Security (QES) for Optical Communications Applications: Secure communication over optical or free space networks Financial networks Transparent access networks: fiber to the home (FTTH); fiber to the

163

Photonic switching devices based on semiconductor nanostructures  

E-Print Network (OSTI)

Focusing and guiding light into semiconductor nanostructures can deliver revolutionary concepts for photonic devices, which offer a practical pathway towards next-generation power-efficient optical networks. In this review, we consider the prospects for photonic switches using semiconductor quantum dots (QDs) and photonic cavities which possess unique properties based on their low dimensionality. The optical nonlinearity of such photonic switches is theoretically analyzed by introducing the concept of a field enhancement factor. This approach reveals drastic improvement in both power-density and speed, which is able to overcome the limitations that have beset conventional photonic switches for decades. In addition, the overall power consumption is reduced due to the atom-like nature of QDs as well as the nano-scale footprint of photonic cavities. Based on this theoretical perspective, the current state-of-the-art of QD/cavity switches is reviewed in terms of various optical nonlinearity phenomena which have been utilized to demonstrate photonic switching. Emerging techniques, enabled by cavity nonlinear effects such as wavelength tuning, Purcell-factor tuning and plasmonic effects are also discussed.

Chao-Yuan Jin; Osamu Wada

2014-02-26T23:59:59.000Z

164

Optical Quadratic Measure Eigenmodes  

E-Print Network (OSTI)

We report a mathematically rigorous technique which facilitates the optimization of various optical properties of electromagnetic fields. The technique exploits the linearity of electromagnetic fields along with the quadratic nature of their interaction with matter. In this manner we may decompose the respective fields into optical quadratic measure eigenmodes (QME). Key applications include the optimization of the size of a focused spot, the transmission through photonic devices, and the structured illumination of photonic and plasmonic structures. We verify the validity of the QME approach through a particular experimental realization where the size of a focused optical field is minimized using a superposition of Bessel beams.

Michael Mazilu; Joerg Baumgartl; Sebastian Kosmeier; Kishan Dholakia

2010-07-13T23:59:59.000Z

165

Light trapping in thin film solar cells using textured photonic crystal  

DOE Patents (OSTI)

A solar cell includes a photoactive region that receives light. A photonic crystal is coupled to the photoactive region, wherein the photonic crystal comprises a distributed Bragg reflector (DBR) for trapping the light.

Yi, Yasha (Somerville, MA); Kimerling, Lionel C. (Concord, MA); Duan, Xiaoman (Amesbury, MA); Zeng, Lirong (Cambridge, MA)

2009-01-27T23:59:59.000Z

166

Enhanced optical power of GaN-based light-emitting diode with compound photonic crystals by multiple-exposure nanosphere-lens lithography  

SciTech Connect

The light-emitting diodes (LEDs) with single, twin, triple, and quadruple photonic crystals (PCs) on p-GaN are fabricated by multiple-exposure nanosphere-lens lithography (MENLL) process utilizing the focusing behavior of polystyrene spheres. Such a technique is easy and economical for use in fabricating compound nano-patterns. The optimized tilted angle is decided to be 26.6 through mathematic calculation to try to avoid the overlay of patterns. The results of scanning electron microscopy and simulations reveal that the pattern produced by MENLL is a combination of multiple ovals. Compared to planar-LED, the light output power of LEDs with single, twin, triple, and quadruple PCs is increased by 14.78%, 36.03%, 53.68%, and 44.85% under a drive current 350?mA, respectively. Furthermore, all PC-structures result in no degradation of the electrical properties. The stimulated results indicate that the highest light extraction efficiency of LED with the clover-shape triple PC is due to the largest scattering effect on propagation of light from GaN into air.

Zhang, Yonghui; Wei, Tongbo, E-mail: tbwei@semi.ac.cn; Xiong, Zhuo; Shang, Liang; Tian, Yingdong; Zhao, Yun; Zhou, Pengyu; Wang, Junxi; Li, Jinmin [Semiconductor Lighting Technology Research and Development Center, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083 (China)

2014-07-07T23:59:59.000Z

167

Near-Infrared Adaptive Optics Imaging of the Central Regions of Nearby Sc Galaxies: I. M33  

E-Print Network (OSTI)

Near-infrared images obtained with the Canada-France-Hawaii Telescope (CFHT) Adaptive Optics Bonnette (AOB) are used to investigate the stellar content within 18 arcsec of the center of the Local Group spiral galaxy M33. AGB stars with near-infrared spectral-energy distributions similar to those of giants in the solar neighborhood and Baade's Window are detected over most of the field. The bolometric luminosity function (LF) of these stars has a discontinuity near M_{bol} = -5.25, and comparisons with evolutionary tracks suggest that most of the AGB stars formed in a burst of star formation 1 - 3 Gyr in the past. The images are also used to investigate the integrated near-infrared photometric properties of the nucleus and the central light concentration. The nucleus is bluer than the central light concentration, in agreement with previous studies at visible wavelengths. The CO index of the central light concentration 0.5 arcsec from the galaxy center is 0.05, which corresponds to [Fe/H] = -1.2 for simple stellar systems. Hence, the central light concentration could not have formed from the chemically-enriched material that dominates the present-day inner disk of M33.

T. J. Davidge

1999-10-18T23:59:59.000Z

168

Efficient photon number detection with silicon avalanche photodiodes  

E-Print Network (OSTI)

We demonstrate an efficient photon number detector for visible wavelengths using a silicon avalanche photodiode. Under subnanosecond gating, the device is able to resolve up to four photons in an incident optical pulse. The detection efficiency at 600 nm is measured to be 73.8%, corresponding to an avalanche probability of 91.1% of the absorbed photons, with a dark count probability below 1.1x10^{-6} per gate. With this performance and operation close to room temperature, fast-gated silicon avalanche photodiodes are ideal for optical quantum information processing that requires single-shot photon number detection.

O. Thomas; Z. L. Yuan; J. F. Dynes; A. W. Sharpe; A. J. Shields

2010-07-21T23:59:59.000Z

169

Heavy photon search experiment at JLAB  

SciTech Connect

The Heavy Photon Search (HPS) experiment in Hall-B at Jefferson Lab will search for new heavy vector boson(s), aka 'heavy photons', in the mass range of 20 MeV/c{sup 2} to 1000 MeV/c{sup 2} using the scattering of high energy, high intensity electron beams off a high Z target. The proposed measurements will cover the region of parameter space favored by the muon g-2 anomaly, and will explore a significant region of parameter space, not only at large couplings (??/? > 10{sup ?7}), but also in the regions of small couplings, down to ??/??10{sup ?10}. The excellent vertexing capability of the Si-tracker uniquely enables HPS to cover the small coupling region. Also, HPS will search for heavy photons in an alternative to the e{sup +}e{sup ?} decay mode, in the heavy photon's decay to ?{sup +}??.

Stepanyan, S. [Jefferson Lab, Newport News, VA (United States); Collaboration: HPS Collaboration

2013-11-07T23:59:59.000Z

170

Optical reference geometry of the Kerr-Newman spacetimes  

E-Print Network (OSTI)

Properties of the optical reference geometry related to Kerr-Newman black-hole and naked-singularity spacetimes are illustrated using embedding diagrams of their equatorial plane. Among all inertial forces defined in the framework of the optical geometry, just the centrifugal force plays a fundamental role in connection to the embedding diagrams because it changes sign at the turning points of the diagrams. The limits of embeddability are given, and it is established which of the photon circular orbits hosted the by Kerr-Newman spacetimes appear in the embeddable regions. Some typical embedding diagrams are constructed, and the Kerr-Newman backgrounds are classified according to the number of embeddable regions of the optical geometry as well as the number of their turning points. Embedding diagrams are closely related to the notion of the radius of gyration which is useful for analyzing fluid rotating in strong gravitational fields.

Zden?k Stuchlk; Stanislav Hledk; Josef Jur?

2008-03-17T23:59:59.000Z

171

Hybrid photonic entanglement: Realization, characterization and applications  

E-Print Network (OSTI)

We show that the quantum disentanglement eraser implemented on a two-photon system from parametric down-conversion is a general method to create hybrid photonic entanglement, namely the entanglement between different degrees of freedom of the photon pair. To demonstrate this, we generate and characterize a source with tunable degree of hybrid entanglement between two qubits, one encoded in the transverse momentum and position of a photon, and the other in the polarization of its partner. In addition, we show that a simple extension of our setup enables the generation of two-photon qubit-qudit hybrid entangled states. Finally, we discuss the advantages that this type of entanglement can bring for an optical quantum network.

Leonardo Neves; Gustavo Lima; Aldo Delgado; Carlos Saavedra

2009-06-24T23:59:59.000Z

172

OPTICAL CONSTANTS OF NH{sub 3} AND NH{sub 3}:N{sub 2} AMORPHOUS ICES IN THE NEAR-INFRARED AND MID-INFRARED REGIONS  

SciTech Connect

Ammonia ice has been detected on different astrophysical media ranging from interstellar medium (ISM) particles to the surface of various icy bodies of our solar system, where nitrogen is also present. We have carried out a detailed study of amorphous NH{sub 3} ice and NH{sub 3}:N{sub 2} ice mixtures, based on infrared (IR) spectra in the mid-IR (MIR) and near-IR (NIR) regions, supported by theoretical quantum chemical calculations. Spectra of varying ice thicknesses were obtained and optical constants were calculated for amorphous NH{sub 3} at 15 K and 30 K and for a NH{sub 3}:N{sub 2} mixture at 15 K over a 500-7000 cm{sup 1} spectral range. These spectra have improved accuracy over previous data, where available. Moreover, we also obtained absolute values for the band strengths of the more prominent IR features in both spectral regions. Our results indicate that the estimated NH{sub 3} concentration in ISM ices should be scaled upward by ?30%.

Zanchet, Alexandre; Rodrguez-Lazcano, Yamilet; Glvez, scar; Herrero, Vctor J.; Escribano, Rafael; Mat, Beln, E-mail: belen.mate@csic.es [Instituto de Estructura de la Materia, IEM-CSIC, Serrano 123, E-28006 Madrid (Spain)

2013-11-01T23:59:59.000Z

173

Photon correlation holography  

Science Journals Connector (OSTI)

Unconventional holography called photon correlation holography is proposed and experimentally demonstrated. Using photon correlation, i.e. intensity correlation or fourth order...

Naik, Dinesh N; Singh, Rakesh Kumar; Ezawa, Takahiro; Miyamoto, Yoko; Takeda, Mitsuo

2011-01-01T23:59:59.000Z

174

Information erasing in the phenomenon of long-lived photon echo  

Science Journals Connector (OSTI)

The possibility of erasing information in an arbitrary cell of an optical memory device based on the phenomenon of long-lived photon echo is theoretically considered. Optimal...

Akhmediev, N N

1990-01-01T23:59:59.000Z

175

E-Print Network 3.0 - air-guiding photonic bandgap Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

of Physics, Ultrafast Optics Group Collection: Engineering ; Physics 31 16:332:592 Optoelectronics II Contemporary Topics in OptoelectronicsPhotonics Summary: bands and bandgaps...

176

E-Print Network 3.0 - advanced photon source Sample Search Results  

NLE Websites -- All DOE Office Websites (Extended Search)

Calculus Fundamentals of Light Sources... 4 Applications of Quantum Physics Optoelectronic Devices Applied Advanced Optics Photonics... . At Algonquin College, courses are...

177

Colored optical glass  

Science Journals Connector (OSTI)

The Lytkarino Optical Glass Factory manufactures various types of colored optical glasses: yellow, orange, and red glasses and glasses that are transparent in the IR region, as well as...

Mogilnaya, L G; Zinoveva, O B; Firsova, Yu A; Gulyukin, M N

2013-01-01T23:59:59.000Z

178

Optical quantum memory  

E-Print Network (OSTI)

Quantum memory is important to quantum information processing in many ways: a synchronization device to match various processes within a quantum computer, an identity quantum gate that leaves any state unchanged, and a tool to convert heralded photons to photons-on-demand. In addition to quantum computing, quantum memory would be instrumental for the implementation of long-distance quantum communication using quantum repeaters. The importance of this basic quantum gate is exemplified by the multitude of optical quantum memory mechanisms being studied: optical delay lines, cavities, electromagnetically-induced transparency, photon-echo, and off-resonant Faraday interaction. Here we report on the state-of-the-art in the field of optical quantum memory, including criteria for successful quantum memory and current performance levels.

A. I. Lvovsky; B. C. Sanders; W. Tittel

2010-02-24T23:59:59.000Z

179

Optical amplifier-powered quantum optical amplification  

E-Print Network (OSTI)

I show that an optical amplifier, when combined with photon subtraction, can be used for quantum state amplification, adding noise at a level below the standard minimum. The device could be used to significantly decrease the probability of incorrectly identifying coherent states chosen from a finite set.

John Jeffers

2011-05-16T23:59:59.000Z

180

Fast quantum dot single photon source triggered at telecommunications wavelength  

E-Print Network (OSTI)

We demonstrate a quantum dot single photon source at 900 nm triggered at 300 MHz by a continuous wave telecommunications wavelength laser followed by an electro-optic modulator. The quantum dot is excited by on-chip-generated second harmonic radiation, resonantly enhanced by a GaAs photonic crystal cavity surrounding the InAs quantum dot. Our result suggests a path toward the realization of telecommunications-wavelength-compatible quantum dot single photon sources with speeds exceeding 1 GHz.

Kelley Rivoire; Sonia Buckley; Arka Majumdar; Hyochul Kim; Pierre Petroff; Jelena Vuckovic

2010-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "regional optics photonics" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


181

Optomechanical microwave sensor at the sub-photon level  

E-Print Network (OSTI)

Due to their low energy content microwave signals at the single-photon level are extremely challenging to measure. Guided by recent progress in single-photon optomechanics and hybrid optomechanical systems, we propose a multimode optomechanical transducer that can detect intensities significantly below the single-photon level via adiabatic transfer of the microwave signal to the optical frequency domain where the measurement is then performed. The influence of intrinsic quantum and thermal fluctuations is also discussed.

Keye Zhang; Francesco Bariani; Ying Dong; Weiping Zhang; Pierre Meystre

2014-09-30T23:59:59.000Z

182

Hybrid approaches to quantum information using ions, atoms and photons  

E-Print Network (OSTI)

This thesis presents two hybrid systems for quantum information processing - one joining cold ions and cold atoms and another coupling linear chains of atomic ions with photons via an optical resonator. The first experimental ...

Cetina, Marko, Ph. D. Massachusetts Institute of Technology

2011-01-01T23:59:59.000Z

183

Novel advancements in nanofabrication for photonic crystal applications  

E-Print Network (OSTI)

The progress of large-area 2D- and 3D-photonic crystals (PCs) at optical and near infra-red frequencies has been limited by fabrication challenges. Periodic nanostructures must be patterned in high-index and crystalline ...

Cheong, Lin Lee

2013-01-01T23:59:59.000Z

184

Department of Electrical Engineering and Computer Science Photonics Education  

E-Print Network (OSTI)

Department of Electrical Engineering and Computer Science Photonics Education Current & Future Education Expectations in Optics & Photonics Barry L. Shoop, Ph.D., P.E. Professor of Electrical Engineering of Electrical Engineering and Computer Science Education & Training Purpose of Education ­ Education in ancient

Van Stryland, Eric

185

Attosecond timing jitter modelocked lasers and ultralow phase noise photonic microwave oscillators  

E-Print Network (OSTI)

Photonic microwave oscillator based on optical frequency comb and ultrastable optical reference cavity represents the state-of-the-art solution to generate X-band microwaves of ultralow phase noise. Such high-quality ...

Li, Duo, Ph. D. Massachusetts Institute of Technology

2014-01-01T23:59:59.000Z

186

Advanced packaging technology for high frequency photonic applications  

SciTech Connect

An advanced packaging concept has been developed for optical devices. This concept allows multiple fibers to be coupled to photonic integrated circuits, with no fiber penetration of the package walls. The principles used to accomplish this concept involves a second-order grating to couple light in or out of the photonic circuit, and a binary optic lens which receives this light and focuses it into a single-mode optical fiber. Design, fabrication and electrical/optical measurements of this packaging concept are described.

Armendariz, M.G.; Hadley, G.R.; Warren, M.E.

1996-03-01T23:59:59.000Z

187

The mystery of spectral breaks: Lyman continuum absorption by photon-photon pair production in the Fermi GeV spectra of bright blazars  

E-Print Network (OSTI)

We reanalyze Fermi/LAT gamma-ray spectra of bright blazars with a higher photon statistics than in previous works and with new Pass 7 data representation. In the spectra of the brightest blazar 3C 454.3 and possibly of 4C +21.35 we detect breaks at 5 GeV (in the rest frame) associated with the photon-photon pair production absorption by He II Lyman continuum (LyC). We also detect confident breaks at 20 GeV associated with hydrogen LyC both in the individual spectra and in the stacked redshift-corrected spectrum of several bright blazars. The detected breaks in the stacked spectra univocally prove that they are associated with atomic ultraviolet emission features of the quasar broad-line region (BLR). The dominance of the absorption by hydrogen Ly complex over He II, rather small detected optical depth, and the break energy consistent with the head-on collisions with LyC photons imply that the gamma-ray emission site is located within the BLR, but most of the BLR emission comes from a flat disk-like structure ...

Stern, Boris E

2014-01-01T23:59:59.000Z

188

Deep near-infrared adaptive optics observations of a young embedded cluster at the edge of the RCW 41 HII region  

E-Print Network (OSTI)

We investigate the star formation activity in a young star forming cluster embedded at the edge of the RCW 41 HII region. As a complementary goal, we aim at demonstrating the gain provided by Wide-Field Adaptive Optics instruments to study young clusters. We used deep, JHKs images from the newly commissioned Gemini-GeMS/GSAOI instrument, complemented with Spitzer IRAC observations, in order to study the photometric properties of the young stellar cluster. GeMS is an AO instrument, delivering almost diffraction limited images over a field of 2' across. The exquisite angular resolution allows us to reach a limiting magnitude of J = 22 for 98% completeness. The combination of the IRAC photometry with our JHKs catalog is used to build color-color diagrams, and select Young Stellar Objects (YSOs) candidates. We detect the presence of 80 Young Stellar Object (YSO) candidates. Those YSOs are used to infer the cluster age, which is found to be in the range 1 to 5 Myr. We find that 1/3 of the YSOs are in a range betwe...

Neichel, B; Plana, H; Zavagno, A; Bernard, A; Fusco, T

2015-01-01T23:59:59.000Z

189

Modular Optical PDV System  

SciTech Connect

A modular optical photon Doppler velocimetry (PDV) detector system has been developed by using readily available optical components with a 20-GHz Miteq optical detector into eight channels of single-wide modules integrated into a 3U rack unit (1U = 1.75 inches) with a common power supply. Optical fibers were precisely trimmed, welded, and timed within each unit. This system has been used to collect dynamic velocity data on various physics experiments. An optical power meter displays the laser input power to the module and optical power at the detector. An adjustable micro-electromechanical system (MEMS) optical attenuator is used to adjust the amount of unshifted light entering the detector. Front panel LEDs show the presence of power to the module. A fully loaded chassis with eight channels consumes 45 watts of power. Each chassis requires 1U spacing above and below for heat management. Modules can be easily replaced.

Araceli Rutkowski, David Esquibel

2008-12-11T23:59:59.000Z

190

Information capacity of a single photon  

Science Journals Connector (OSTI)

Quantum states of light are the obvious choice for communicating quantum information. To date, encoding information into the polarization states of single photons has been widely used as these states form a natural closed two-state qubit. However, photons are able to encode much morein principle, infiniteinformation via the continuous spatiotemporal degrees of freedom. Here we consider the information capacity of an optical quantum channel, such as an optical fiber, where a spectrally encoded single photon is the means of communication. We use the Holevo bound to calculate an upper bound on the channel capacity, and relate this to the spectral encoding basis and the spectral properties of the channel. Further, we derive analytic bounds on the capacity of such channels, and, in the case of a symmetric two-state encoding, calculate the exact capacity of the corresponding channel.

Peter P. Rohde; Joseph F. Fitzsimons; Alexei Gilchrist

2013-08-09T23:59:59.000Z

191

Single Photon Source Using Laser Pulses and Two-Photon Absorption  

E-Print Network (OSTI)

We have previously shown that two-photon absorption (TPA) and the quantum Zeno effect can be used to make deterministic quantum logic devices from an otherwise linear optical system. Here we show that this type of quantum Zeno gate can be used with additional two-photon absorbing media and weak laser pulses to make a heralded single photon source. A source of this kind is expected to have a number of practical advantages that make it well suited for large scale quantum information processing applications.

B. C. Jacobs; T. B. Pittman; J. D. Franson

2006-03-15T23:59:59.000Z

192

APS News 2010 | Advanced Photon Source  

NLE Websites -- All DOE Office Websites (Extended Search)

Lahsen Assoufid Named Fellow of the Optical Society Lahsen Assoufid Named Fellow of the Optical Society Lahsen Assoufid Named Fellow of the Optical Society December 16, 2010 Lahsen Assoufid of the Argonne X-ray Science Division has been made a Fellow of the Optical Society "For contributions and leadership in x-ray optics, metrology, and nanofocusing optics development." George Srajer and Jin Wang Elected Fellows of the American Physical Society George Srajer and Jin Wang Elected Fellows of the American Physical Society December 16, 2010 George Srajer and Jin Wang, both of the U.S. Department of Energy's Advanced Photon Source at Argonne, have been elected Fellows of the American Physical Society. Argonne-U. of C. Collaborative Seed Grant to Fund Novel PET System Argonne-U. of C. Collaborative Seed Grant to Fund Novel PET System

193

Photonic crystals with controlled disorder  

SciTech Connect

Photonic crystals are extremely sensitive to structural disorder even to the point of completely losing their functionalities. While, on one side, this can be detrimental for applications in traditional optical devices, on the other side, it gives also rise to very interesting new physics and maybe even new applications. We propose a route to introduce disorder in photonic crystals in a controlled way by creating a certain percentage of vacancies in the lattice. We show how the method works and what type of materials can be obtained this way. Also, we use this system to probe the role of disorder on the resulting transport properties from various points of view, including measurements of the transport and scattering mean free path and the diffusion constant.

Garcia, P. D.; Sapienza, R.; Lopez, C. [Instituto de Ciencia de Materiales de Madrid (CSIC) and Unidad Asociada CSIC-UVigo, Cantoblanco E-28049, Madrid (Spain); Toninelli, C.; Wiersma, D. S. [European Laboratory for Nonlinear Spectroscopy and CNR-INO, 50019 Sesto Fiorentino, Florence (Italy)

2011-08-15T23:59:59.000Z

194

Photon position measure  

E-Print Network (OSTI)

The positive operator valued measure (POVM) for a photon counting array detector is derived and found to equal photon flux density integrated over pixel area and measurement time. Since photon flux density equals number density multiplied by the speed of light, this justifies theoretically the observation that a photon counting array provides a coarse grained measurement of photon position. The POVM obtained here can be written as a set of projectors onto a basis of localized states, consistent with the description of photon position in a recent quantum imaging proposal [M. Tsang, Phys. Rev. Lett. \\textbf{102}, 253601 (2009)]. The wave function that describes a photon counting experiment is the projection of the photon state vector onto this localized basis. Collapse is to the electromagnetic vacuum and not to a localized state, thus violating the text book rules of quantum mechanics but compatible with the theory of generalized observables and the nonlocalizability of an incoming photon.

Margaret Hawton

2010-07-03T23:59:59.000Z

195

Photon position measure  

E-Print Network (OSTI)

The positive operator valued measure (POVM) for a photon counting array detector is derived and found to equal photon flux density integrated over pixel area and measurement time. Since photon flux density equals number density multiplied by the speed of light, this justifies theoretically the observation that a photon counting array provides a coarse grained measurement of photon position. The POVM obtained here can be written as a set of projectors onto a basis of localized states, consistent with the description of photon position in a recent quantum imaging proposal [M. Tsang, Phys. Rev. Lett. \\textbf{102}, 253601 (2009)]. The wave function that describes a photon counting experiment is the projection of the photon state vector onto this localized basis. Collapse is to the electromagnetic vacuum and not to a localized state, thus violating the text book rules of quantum mechanics but compatible with the theory of generalized observables and the nonlocalizability of an incoming photon.

Hawton, Margaret

2010-01-01T23:59:59.000Z

196

Microwave Photon Counter Based on Josephson Junctions Y.-F. Chen,1,* D. Hover,1  

E-Print Network (OSTI)

Microwave Photon Counter Based on Josephson Junctions Y.-F. Chen,1,* D. Hover,1 S. Sendelbach,1 L on the current-biased Josephson junction. The junction is tuned to absorb single microwave photons from optical photon counters, it is natural to consider the Josephson junction--a nonlinear, nondissipative

Saffman, Mark

197

Reduction of quantum noise in transmittance estimation using photon-correlated beams  

E-Print Network (OSTI)

Reduction of quantum noise in transmittance estimation using photon-correlated beams Majeed M-number squeezed light. We consider the use of two photon-correlated beams (generated, for example, by spontaneous parametric downconversion) to measure the optical transmittance of an object. The photons of each beam obey

Hayat, Majeed M.

198

AE Photonics | Open Energy Information  

Open Energy Info (EERE)

Photonics Jump to: navigation, search Name: AE Photonics Place: Germany Product: Germany-based PV system and component supplier References: AE Photonics1 This article is a stub....

199

Electronics and photonics: two sciences in the benefit of solar energy conversion  

E-Print Network (OSTI)

This paper gives a personal global point of view on two sciences: electronics and photonics towards plasmonics and solar energy conversion. The new research directions in these two sciences are pointed out by comparison and in the perspective of future new solar devices. A parallel and the equivalence between electronics and photonics are presented. Starting from electron in electronics, photon, solitons and plasmons in photonics, electrical cables - optical fibers, plasmonic wave guides, electrical circuits - optical circuits, electrical transistors - optical transistors, plasmonster, electrical generators - pulsed lasers and spasers, photonics gets step by step all the tools already existing in electronics. Solar energy could be converted in many ways, the most known is the conversion in electricity. Today we need that the energy is in form of electricity because most of the apparatus that we use are based on electricity: informatics, motors, etc. However, the progress in photonics with optical circuits, op...

Girtan, M

2012-01-01T23:59:59.000Z

200

Lasing modes in polycrystalline and amorphous photonic structures  

SciTech Connect

We systematically studied the lasing characteristics in photonic polycrystalline and amorphous structures. 2D arrays of air holes were fabricated in a GaAs membrane. InAs quantum dots embedded in the membrane provide gain for lasing under optical pumping. The lasing modes are spatially localized, and blue shift as the structural order becomes short ranged. Our three-dimensional numerical simulations reveal that the out-of-plane leakage of the lasing mode dominates over the in-plane leakage. The lasing modes in a photonic polycrystalline move away from the center frequency of the photonic band gap to reduce the out-of-plane leakage. In a photonic amorphous structure, the short-range order improves optical confinement and enhances the quality factor of resonances. Understanding the behavior of photonic polycrystalline laser and amorphous laser opens the possibility of controlling lasing characteristic by varying the degree of structural order.

Yang, Jin-Kyu [Department of Applied Physics, Yale University, New Haven, Connecticut 06520 (United States); Department of Optical Engineering, Kongju National University, Kongju 314-701 (Korea, Republic of); Noh, Heeso; Liew, Seng Fatt; Rooks, Michael J. [Department of Applied Physics, Yale University, New Haven, Connecticut 06520 (United States); Solomon, Glenn S. [Joint Quantum Institute, NIST and University of Maryland, Gaithersburg, Maryland 20899 (United States); Cao Hui [Department of Applied Physics, Yale University, New Haven, Connecticut 06520 (United States); Department of Physics, Yale University, New Haven, Connecticut 06520 (United States)

2011-09-15T23:59:59.000Z

Note: This page contains sample records for the topic "regional optics photonics" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


201

Photonic Crystal Fibers Advances in Fiber Optics  

E-Print Network (OSTI)

susceptible to electromagnetic interference (EMI) from signals on neighbouring lines. From a speed perspective

La Rosa, Andres H.

202

Complex-shaped three-dimensional microstructures and photonic crystals generated in a polysiloxane polymer by two-photon microstereolithography  

Science Journals Connector (OSTI)

Two-photon photopolymerization of inorganicorganic hybrid materials permits the generation of complex-shaped three-dimensional microstructures at submicrometer resolution of structural elements. Due to their favorable optical, chemical and thermal properties these materials are particularly useful for photonic microdevice fabrication. Focussing ultrashort pulsed visible light into a modified commercially available polysiloxane polymer a Sydney Opera House design and a series of woodpile-type photonic crystals were fabricated. Fourier transform infrared spectroscopy revealed photonic stop gaps in the stacking direction at wavelengths varying from 6 to 4?m upon reduction of the woodpile rod size. The structures allowed for the observation of higher-order stop gaps.

M. Straub; L.H. Nguyen; A. Fazlic; M. Gu

2004-01-01T23:59:59.000Z

203

Photon Sciences | About the Photon Sciences Directorate  

NLE Websites -- All DOE Office Websites (Extended Search)

About the Photon Sciences Directorate About the Photon Sciences Directorate The Photon Sciences Directorate operates the National Synchrotron Light Source (NSLS) and is constructing the National Synchrotron Light Source II (NSLS-II), both funded by the Department of Energy Office of Science. These facilities support a large community of scientists using photons (light) to carry out research in energy and environmental sciences, physics, materials science, chemistry, biology and medicine. NSLS National Synchrotron Light Source NSLS-II National Synchrotron Light Source II This is a very exciting period for photon sciences at Brookhaven Lab and a time of unprecedented growth for the directorate. The NSLS-II Project is progressing rapidly and smoothly through design and construction, driven by

204

Near perfect optics  

SciTech Connect

This report discusses a novel fabrication process to produce nearly perfect optics. The process utilizes vacuum deposition techniques to optimally modify polished optical substrate surfaces. The surface figure, i.e. contour of a polished optical element, is improved by differentially filling in the low spots on the surface using flux from a physical vapor deposition source through an appropriate mask. The process is expected to enable the manufacture of diffraction-limited optical systems for the UV, extreme UV, and soft X-ray spectral regions, which would have great impact on photolithography and astronomy. This same technique may also reduce the fabrication cost of visible region optics with aspheric surfaces.

Goeke, R.; Farnsworth, A.V.; Neumann, C.C.; Sweatt, W.C.; Warren, M.E.; Weed, J.W.

1996-06-01T23:59:59.000Z

205

Electrically-driven optical antennas  

E-Print Network (OSTI)

Unlike radiowave antennas, optical nanoantennas so far cannot be fed by electrical generators. Instead, they are driven by light or via optically active materials in their proximity. Here, we demonstrate direct electrical driving of an optical nanoantenna featuring an atomic-scale feed gap. Upon applying a voltage, quantum tunneling of electrons across the feed gap creates broadband quantum shot noise. Its optical frequency components are efficiently converted into photons by the antenna. We demonstrate that the properties of the emitted photons are fully controlled by the antenna architecture, and that the antenna improves the quantum efficiency by up to two orders of magnitude with respect to a non-resonant reference system. Our work represents a new paradigm for interfacing electrons and photons at the nanometer scale, e.g. for on-chip wireless data communication, electrically driven single- and multiphoton sources, as well as for background-free linear and nonlinear spectroscopy and sensing with nanometer...

Kern, Johannes; Prangsma, Jord C; Emmerling, Monika; Kamp, Martin; Hecht, Bert

2015-01-01T23:59:59.000Z

206

Photon Physics in ALICE  

E-Print Network (OSTI)

We give an overview of photon physics which will be studied by the ALICE experiment in proton-proton and heavy ion collisions at LHC. We compare properties of ALICE photon detectors and estimate their ability to measure neutral meson and direct photon spectra as well as gamma-hadron and gamma-jet correlations in pp and Pb+Pb collisions.

D. Peressounko; Y. Kharlov; for the ALICE collaboration

2009-07-16T23:59:59.000Z

207

X-Ray Entangled Photon Production in Collisions of Laser Beams with Relativistic Ions  

E-Print Network (OSTI)

A method is suggested to produce, with the help of colliding laser photons with bunches of relativistic ions having two energy levels, both intense beams of monochromatic polarized X-ray fluorescence photons and significant number of X-ray entangled photons, via double Doppler transformation. Nonlinear susceptibility of the ions, the cross section and the rate of production of such photons at RHIC are estimated. Such beams of X-ray photons can be detected and applied to solve various problems, in a manner similar to the usage of optical photons.

K. A. Ispirian; M. K. Ispiryan

2010-04-02T23:59:59.000Z

208

Optical remote monitoring of CH/sub 4/ gas using low-loss optical fiber link and InGaAsP light-emitting diode in 1. 33-. mu. m region  

SciTech Connect

Purely optical remote monitoring of low-level CH/sub 4/ gas is realized for the first time by the method employing a 2-km long-distance, low-loss silica optical fiber link and a compact absorption cell in conjunction with a high radiant InGaAsP light-emitting diode (LED) at 1.33 ..mu..m. Based on the present experiment, the detection limit of CH/sub 4/ in air was confirmed to be approximately 2000 ppm, i.e., 4% of the lower explosion limit of CH/sub 4/. This result supports the conclusion that the fully optical remote sensing system incorporating ultralow loss optical fiber networks and near infrared LEDs or laser diodes can be extensively used for the detection and surveillance of various inflammable and/or explosive gases in industrial and mining complexes as well as in residential areas.

Chan, K.; Ito, H.; Inaba, H.

1983-10-01T23:59:59.000Z

209

Extensive study of the optical spectra for high-temperature superconducting oxides and their related materials from the infrared to the vacuum-ultraviolet energy region  

Science Journals Connector (OSTI)

Optical reflectivity spectra of (La, Sr)2CuO4 and YBa2Cu3Oy have been measured over a wide spectral range as high as 40 eV. Although overall...

Tajima, S; Seki, M; Hidaka, Y; Oka, K; Unoki, H; Suzuki, M; Suga, S; Ishii, H; Nakahashi, T; Murakami, T; Takagi, T; Uchida, S

1989-01-01T23:59:59.000Z

210

Preparation, optical and non-linear optical power limiting properties of Cu, CuNi nanowires  

SciTech Connect

Metallic nanowires show excellent Plasmon absorption which is tunable based on its aspect ratio and alloying nature. We prepared Cu and CuNi metallic nanowires and studied its optical and nonlinear optical behavior. Optical properties of nanowires are theoretically explained using Gans theory. Nonlinear optical behavior is studied using a single beam open aperture z-scan method with the use of 5?ns Nd: YAG laser. Optical limiting is found to arise from two-photon absorption.

Udayabhaskar, R.; Karthikeyan, B., E-mail: bkarthik@nitt.edu [Department of Physics, National Institute of Technology, Tiruchirappalli 620 015 (India); Ollakkan, Muhamed Shafi [Light and Matter Physics Group, Raman Research Institute, Bangalore 560 080 (India)] [Light and Matter Physics Group, Raman Research Institute, Bangalore 560 080 (India)

2014-01-06T23:59:59.000Z

211

Projection imaging of photon beams by the Cerenkov effect  

SciTech Connect

Purpose: A novel technique for beam profiling of megavoltage photon beams was investigated for the first time by capturing images of the induced Cerenkov emission in water, as a potential surrogate for the imparted dose in irradiated media. Methods: A high-sensitivity, intensified CCD camera (ICCD) was configured to acquire 2D projection images of Cerenkov emission from a 4 Multiplication-Sign 4 cm{sup 2} 6 MV linear accelerator (LINAC) x-ray photon beam operating at a dose rate of 400 MU/min incident on a water tank with transparent walls. The ICCD acquisition was gated to the LINAC sync pulse to reduce background light artifacts, and the measurement quality was investigated by evaluating the signal to noise ratio and measurement repeatability as a function of delivered dose. Monte Carlo simulations were used to derive a calibration factor for differences between the optical images and deposited dose arising from the anisotropic angular dependence of Cerenkov emission. Finally, Cerenkov-based beam profiles were compared to a percent depth dose (PDD) and lateral dose profile at a depth of d{sub max} from a reference dose distribution generated from the clinical Varian ECLIPSE treatment planning system (TPS). Results: The signal to noise ratio was found to be 20 at a delivered dose of 66.6 cGy, and proportional to the square root of the delivered dose as expected from Poisson photon counting statistics. A 2.1% mean standard deviation and 5.6% maximum variation in successive measurements were observed, and the Monte Carlo derived calibration factor resulted in Cerenkov emission images which were directly correlated to deposited dose, with some spatial issues. The dose difference between the TPS and PDD predicted by Cerenkov measurements was within 20% in the buildup region with a distance to agreement (DTA) of 1.5-2 mm and {+-}3% at depths beyond d{sub max}. In the lateral profile, the dose difference at the beam penumbra was within {+-}13% with a DTA of 0-2 mm, {+-}5% in the central beam region, and 2%-3% in the beam umbra. Conclusions: The results from this initial study demonstrate the first documented use of Cerenkov emission imaging to profile x-ray photon LINAC beams in water. The proposed modality has several potential advantages over alternative methods, and upon future refinement may prove to be a robust and novel dosimetry method.

Glaser, Adam K.; Davis, Scott C.; McClatchy, David M.; Zhang, Rongxiao; Pogue, Brian W.; Gladstone, David J. [Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire 03755 (United States); Department of Physics and Astronomy, Dartmouth College, Hanover, New Hampshire 03755 (United States); Thayer School of Engineering and Department of Physics and Astronomy, Dartmouth College, Hanover, New Hampshire 03755 (United States); Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire 03766 (United States)

2013-01-15T23:59:59.000Z

212

Advanced Optics | Center for Functional Nanomaterials  

NLE Websites -- All DOE Office Websites (Extended Search)

Optical Spectroscopy and Microscopy Optical Spectroscopy and Microscopy optics The Advanced Optical Spectroscopy & Microscopy Facility combines a broad range of optical instruments suitable for studies of optical properties of hard, soft or biological materials using ultrafast and nonlinear spectroscopy, and single-molecule optical and confocal methods. Capabilities Fluorescence imaging (up to five channels simultaneously), two-color fluorescence lifetime imaging, spectral imaging, and fluorescence correlation spectroscopy Fluorescence lifetime measurements, including time-resolved fluorescence anisotropy and time-resolved fluorescence spectra, using single-photon counting and fluorescence upconversion methods Single-molecule spectroscopy: fluorescence intensity, lifetimes, anisotropy and fluorescence spectra

213

Synthesis and Analysis of Entangled Photonic Qubits in Spatial-Parity Space  

E-Print Network (OSTI)

We present the novel embodiment of a photonic qubit that makes use of one continuous spatial degree of freedom of a single photon and relies on the the parity of the photon's transverse spatial distribution. Using optical spontaneous parametric downconversion to produce photon pairs, we demonstrate the controlled generation of entangled-photon states in this new space. Specifically, two Bell states, and a continuum of their superpositions, are generated by simple manipulation of a classical parameter, the optical-pump spatial parity, and not by manipulation of the entangled photons themselves. An interferometric device, isomorphic in action to a polarizing beam splitter, projects the spatial-parity states onto an even--odd basis. This new physical realization of photonic qubits could be used as a foundation for future experiments in quantum information processing.

Timothy Yarnall; Ayman F. Abouraddy; Bahaa E. A. Saleh; Malvin C. Teich

2007-08-22T23:59:59.000Z

214

X-Ray Interactions with Matter from the Center for X-Ray Optics (CXRO)  

DOE Data Explorer (OSTI)

The primary interactions of low-energy x-rays within condensed matter, viz. photoabsorption and coherent scattering, are described for photon energies outside the absorption threshold regions by using atomic scattering factors. The atomic scattering factors may be accurately determined from the atomic photoabsorption cross sections using modified Kramers-Kronig dispersion relations. From a synthesis of the currently available experimental data and recent theoretical calculations for photoabsorption, the angle-independent, forward-scattering components of the atomic scattering factors have been thus semiempirically determined and tabulated here for 92 elements and for the region 50-30,000 eV. Atomic scattering factors for all angles of coherent scattering and at the higher photon energies are obtained from these tabulated forward-scattering values by adding a simple angle-dependent form-factor correction. The incoherent scattering contributions that become significant for the light elements at the higher photon energies are similarly determined. The basic x-ray interaction relations that are used in applied x-ray physics are presented here in terms of the atomic scattering factors. The bulk optical constants are also related to the atomic scattering factors. These atomic and optical relations are applied to the detailed calculation of the reflectivity characteristics of a series of practical x-ray mirror, multilayer, and crystal monochromators. Comparisons of the results of this semiempirical,"atom-like", description of x-ray interactions for the low-energy region with those of experiment and ab initio theory are presented.

Henke, B.L.; Gullikson, E.M.; Davis, J.C.

215

Giant electro-optic effect using polarizable dark states  

E-Print Network (OSTI)

The electro-optic effect, where the refractive index of a medium is modified by an electric field, is of central importance in non-linear optics, laser technology, quantum optics and optical communications. In general, electro-optic coefficients are very weak and a medium with a giant electro-optic coefficient would have profound implications for non-linear optics, especially at the single photon level, enabling single photon entanglement and switching. Here we propose and demonstrate a giant electro-optic effect based on polarizable dark states. We demonstrate phase modulation of the light field in the dark state medium and measure an electro-optic coefficient that is more than 12 orders of magnitude larger than in other gases. This enormous Kerr non-linearity also creates the potential for precision electrometry and photon entanglement.

A. K. Mohapatra; M. G. Bason; B. Butscher; K. J. Weatherill; C. S. Adams

2008-08-19T23:59:59.000Z

216

Photonically Engineered Incandescent Emitter  

DOE Patents (OSTI)

A photonically engineered incandescence is disclosed. The emitter materials and photonic crystal structure can be chosen to modify or suppress thermal radiation above a cutoff wavelength, causing the emitter to selectively emit in the visible and near-infrared portions of the spectrum. An efficient incandescent lamp is enabled thereby. A method for fabricating a three-dimensional photonic crystal of a structural material, suitable for the incandescent emitter, is also disclosed.

Gee, James M. (Albuquerque, NM); Lin, Shawn-Yu (Albuquerque, NM); Fleming, James G. (Albuquerque, NM); Moreno, James B. (Albuquerque, NM)

2005-03-22T23:59:59.000Z

217

Quantum limits to estimation of photon deformation  

E-Print Network (OSTI)

We address potential deviations of radiation field from the bosonic behaviour and employ local quantum estimation theory to evaluate the ultimate bounds to precision in the estimation of these deviations using quantum-limited measurements on optical signals. We consider different classes of boson deformation and found that intensity measurement on coherent or thermal states would be suitable for their detection making, at least in principle, tests of boson deformation feasible with current quantum optical technology. On the other hand, we found that the quantum signal-to-noise ratio (QSNR) is vanishing with the deformation itself for all the considered classes of deformations and probe signals, thus making any estimation procedure of photon deformation inherently inefficient. A partial way out is provided by the polynomial dependence of the QSNR on the average number of photon, which suggests that, in principle, it would be possible to detect deformation by intensity measurements on high-energy thermal states.

Giovanni De Cillis; Matteo G. A. Paris

2014-07-08T23:59:59.000Z

218

Graphene Integrated Microwave Photonics  

Science Journals Connector (OSTI)

This paper proposes and analyzes the incorporation of graphene to integrated waveguides and circuits for application to the field of microwave photonics (MWP). We discuss the main...

Capmany, Jos; Domnech, David; Muoz, Pascual

2014-01-01T23:59:59.000Z

219

Photons & Fusion Newsletter - 2014  

NLE Websites -- All DOE Office Websites (Extended Search)

news Photons & Fusion Newsletter - 2014 May ARC Beamlet Profiles NIF Petawatt Laser Is on Track to Completion The Advanced Radiographic Capability (ARC), a petawatt-class laser now...

220

EMSL - single photon  

NLE Websites -- All DOE Office Websites (Extended Search)

photon en Structures and Stabilities of (MgO)n Nanoclusters. http:www.emsl.pnl.govemslwebpublicationsstructures-and-stabilities-mgon-nanoclusters

Note: This page contains sample records for the topic "regional optics photonics" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


221

Thermal photons to dileptons ratio at LHC  

E-Print Network (OSTI)

It is shown that the ratio of transverse momentum (p_T) distribution of thermal photons to dileptons produced in heavy ion collisions reaches a plateau above p_T=1 GeV. We argue that the value of the ratio in the plateau region can be used to estimate the initial temperature.

Jajati K. Nayak; Jan-e Alam; Sourav Sarkar; Bikash Sinha

2007-05-24T23:59:59.000Z

222

Analysis and characterization of slab-coupled optical waveguide amplifiers and lasers  

E-Print Network (OSTI)

Semiconductor optical devices are important in the photonics industry due to their significant advantages in size, weight, and power consumption (SWAP) and to their capability for photonic integration. However, these devices ...

Loh, William, Ph. D. Massachusetts Institute of Technology

2009-01-01T23:59:59.000Z

223

Role of color center induced absorption in all?optical switching  

Science Journals Connector (OSTI)

We show that color center induced absorption can mimic two?photon absorption and may limit all?optical switching even for very short pulses. Two?photon and color center induced absorption are measured in a lead glass fiber.

K. W. DeLong; Victor Mizrahi; G. I. Stegeman; M. A. Saifi; M. J. Andrejco

1990-01-01T23:59:59.000Z

224

Optical coherence tomography based on intensity correlations of quasi-thermal light  

E-Print Network (OSTI)

We show theoretically that the longitudinal resolution of conventional optical coherence tomography can be improved by a factor of radic2 when a two-photon (as opposed to a single-photon) sensitive detector is used, and ...

Zerom, Petros

225

Indistinguishable Photons from a Single Molecule  

E-Print Network (OSTI)

We report the results of coincidence counting experiments at the output of a Michelson interferometer using the zero-phonon-line emission of a single molecule at $1.4 K$. Under continuous wave excitation, we observe the absence of coincidence counts as an indication of two-photon interference. This corresponds to the observation of Hong-Ou-Mandel correlations and proves the suitability of the zero-phonon-line emission of single molecules for applications in linear optics quantum computation.

A. Kiraz; M. Ehrl; Th. Hellerer; O. E. Mustecaplioglu; C. Brauchle; A. Zumbusch

2005-05-05T23:59:59.000Z

226

Sub-Rayleigh quantum imaging using single-photon sources  

SciTech Connect

We propose a technique capable of imaging a distinct physical object with sub-Rayleigh resolution in an ordinary far-field imaging setup using single-photon sources and linear optical tools only. We exemplify our method for the case of a rectangular aperture and two or four single-photon emitters obtaining a resolution enhanced by a factor of 2 or 4, respectively.

Thiel, C.; Zanthier, J. von [Institut fuer Optik, Information und Photonik, Universitaet Erlangen-Nuernberg, 91058 Erlangen (Germany); Bastin, T. [Institut de Physique Nucleaire, Atomique et de Spectroscopie, Universite de Liege, 4000 Liege (Belgium); Agarwal, G. S. [Department of Physics, Oklahoma State University, Stillwater, Oklahoma 74078-3072 (United States)

2009-07-15T23:59:59.000Z

227

Breaking symmetries in ordered materials : spin polarized light transport in magnetized noncentrosymmetric 1D photonic crystals, and photonic gaps and fabrication of quasiperiodic structured materials from interference lithography  

E-Print Network (OSTI)

Effects of breaking various symmetries on optical properties in ordered materials have been studied. Photonic crystals lacking space-inversion and time-reversal symmetries were shown to display nonreciprocal dispersion ...

Bita, Ion

2006-01-01T23:59:59.000Z

228

Single-Photon Spectroscopy of a Single Molecule  

Science Journals Connector (OSTI)

Efficient interaction of light and matter at the ultimate limit of single photons and single emitters is of great interest from a fundamental point of view and for emerging applications in quantum engineering. However, the difficulty of generating single-photon streams with specific wavelengths, bandwidths, and power as well as the weak interaction probability of a single photon with an optical emitter pose a formidable challenge toward this goal. Here, we demonstrate a general approach based on the creation of single photons from a single emitter and their use for performing spectroscopy on a second emitter situated at a distance. While this first proof of principle realization uses organic molecules as emitters, the scheme is readily extendable to quantum dots and color centers. Our work ushers in a new line of experiments that provide access to the coherent and nonlinear couplings of few emitters and few propagating photons.

Y. L. A. Rezus; S. G. Walt; R. Lettow; A. Renn; G. Zumofen; S. Gtzinger; V. Sandoghdar

2012-02-27T23:59:59.000Z

229

Conditional preparation of states containing a definite number of photons  

E-Print Network (OSTI)

A technique for conditionally creating single- or multimode photon-number states is analyzed using Bayesian theory. We consider the heralded N-photon states created from the photons produced by an unseeded optical parametric amplifier when the heralding detector is the time-multiplexed photon-number-resolving detector recently demonstrated by Fitch, et al. [Phys. Rev. A 68, 043814 (2003).] and simultaneously by Achilles, et al. [Opt. Lett. 28, 2387 (2003).]. We find that even with significant loss in the heralding detector, fields with sub-Poissonian photon-number distributions can be created. We also show that heralded multimode fields created using this technique are more robust against detector loss than are single-mode fields.

Malcolm N. O'Sullivan; Kam Wai Clifford Chan; Vasudevan Lakshminarayanan; Robert W. Boyd

2007-09-28T23:59:59.000Z

230

Heralded single photon absorption by a single atom  

E-Print Network (OSTI)

The emission and absorption of single photons by single atomic particles is a fundamental limit of matter-light interaction, manifesting its quantum mechanical nature. At the same time, as a controlled process it is a key enabling tool for quantum technologies, such as quantum optical information technology [1, 2] and quantum metrology [3, 4, 5, 6]. Controlling both emission and absorption will allow implementing quantum networking scenarios [1, 7, 8, 9], where photonic communication of quantum information is interfaced with its local processing in atoms. In studies of single-photon emission, recent progress includes control of the shape, bandwidth, frequency, and polarization of single-photon sources [10, 11, 12, 13, 14, 15, 16, 17], and the demonstration of atom-photon entanglement [18, 19, 20]. Controlled absorption of a single photon by a single atom is much less investigated; proposals exist but only very preliminary steps have been taken experimentally such as detecting the attenuation and phase shift of a weak laser beam by a single atom [21, 22], and designing an optical system that covers a large fraction of the full solid angle [23, 24, 25]. Here we report the interaction of single heralded photons with a single trapped atom. We find strong correlations of the detection of a heralding photon with a change in the quantum state of the atom marking absorption of the quantum-correlated heralded photon. In coupling a single absorber with a quantum light source, our experiment demonstrates previously unexplored matter-light interaction, while opening up new avenues towards photon-atom entanglement conversion in quantum technology.

Nicolas Piro; Felix Rohde; Carsten Schuck; Marc Almendros; Jan Huwer; Joyee Ghosh; Albrecht Haase; Markus Hennrich; Francois Dubin; Jrgen Eschner

2010-04-23T23:59:59.000Z

231

A magneto-optic modulator with unit quantum effciency  

E-Print Network (OSTI)

We propose a device for the reversible and quiet conversion of microwave photons to optical sideband photons, that can reach 100% quantum effciency. The device is based on an erbium doped crystal placed in both an optical and microwave resonator. We show that effcient conversion can be achieved so long as the product of the optical and microwave cooperativity factors can be made large. We argue achieving this regime is feasible with current technology and we discuss a possible implementation.

Lewis A. Williamson; Yu-Hui Chen; Jevon J. Longdell

2014-10-23T23:59:59.000Z

232

Photon collider Higgs factories  

E-Print Network (OSTI)

The discovery of the Higgs boson (and still nothing else) have triggered appearance of many proposals of Higgs factories for precision measurement of the Higgs properties. Among them there are several projects of photon colliders (PC) without e+e- in addition to PLC based on e+e- linear colliders ILC and CLIC. In this paper, following a brief discussion of Higgs factories physics program I give an overview of photon colliders based on linear colliders ILC and CLIC, and of the recently proposed photon-collider Higgs factories with no e+e- collision option based on recirculation linacs in ring tunnels.

V. I. Telnov

2014-09-19T23:59:59.000Z

233

Optics on the Brain: OSAs Mulitphoton and Patterned Optogenetics Incubator  

Science Journals Connector (OSTI)

A December 2013 OSA incubator meeting highlighted the role of cutting-edge optics and photonics in solving the mysteries of neuroscienceand helped forge connections...

Adesnik, Hillel; Waller, Laura; Shoham, Shy

2014-01-01T23:59:59.000Z

234

High speed silicon electro-optical modulators enhanced via slow light propagation  

Science Journals Connector (OSTI)

While current optical communication networks efficiently carry and process huge amounts of digital information over large and medium distances, silicon photonics technology has the...

Brimont, A; Thomson, D J; Sanchis, P; Herrera, J; Gardes, F Y; Fedeli, J M; Reed, G T; Mart, J

2011-01-01T23:59:59.000Z

235

Quantum Frequency Translation of Single-Photon States in Photonic Crystal Fiber  

E-Print Network (OSTI)

We experimentally demonstrate frequency translation of a nonclassical optical field via the Bragg scattering four-wave mixing process in a photonic crystal fiber (PCF). The high nonlinearity and the ability to control dispersion in PCF enable efficient translation between photon channels within the visible to-near-infrared spectral range, useful in quantum networks. Heralded single photons at 683 nm were translated to 659 nm with an efficiency of $28.6 \\pm 2.2$ percent. Second-order correlation measurements on the 683-nm and 659-nm fields yielded $g^{(2)}_{683}(0) = 0.21 \\pm 0.02$ and $g^{(2)}_{659}(0) = 0.19 \\pm 0.05$ respectively, showing the nonclassical nature of both fields.

H. J. McGuinness; M. G. Raymer; C. J. McKinstrie; S. Radic

2010-06-23T23:59:59.000Z

236

Enhanced photoacoustic detection using photonic crystal substrate  

SciTech Connect

This paper demonstrates the enhanced photoacoustic sensing of surface-bound light absorbing molecules and metal nanoparticles using a one-dimensional photonic crystal (PC) substrate. The PC structure functions as an optical resonator at the wavelength where the analyte absorption is strong. The optical resonance of the PC sensor provides an intensified evanescent field with respect to the excitation light source and results in enhanced optical absorption by surface-immobilized samples. For the analysis of a light absorbing dye deposited on the PC surface, the intensity of photoacoustic signal was enhanced by more than 10-fold in comparison to an un-patterned acrylic substrate. The technique was also applied to detect gold nanorods and exhibited more than 40 times stronger photoacoustic signals. The demonstrated approach represents a potential path towards single molecule absorption spectroscopy with greater performance and inexpensive instrumentation.

Zhao, Yunfei; Liu, Kaiyang [Department of Electrical and Computer Engineering, Iowa State University, Ames, Iowa 50011 (United States); McClelland, John [Ames Laboratory-USDOE, Ames, Iowa 50011 (United States); Department of Mechanical Engineering, Iowa State University, Ames, Iowa 50011 (United States); Department of Biochemistry, Biophysics, and Molecular Biology, Iowa State University, Ames, Iowa 50011 (United States); Lu, Meng, E-mail: menglu@iastate.edu [Department of Electrical and Computer Engineering, Iowa State University, Ames, Iowa 50011 (United States); Department of Mechanical Engineering, Iowa State University, Ames, Iowa 50011 (United States)

2014-04-21T23:59:59.000Z

237

Semiconductor Nanowire Optical Antenna Solar Absorbers  

E-Print Network (OSTI)

technology. KEYWORDS Solar cell, semiconductor nanowires, optical antennas, photon management, light trapping a clear, intuitive guidance for the design of efficient NW solar cells. The presented approach to exhibit a strongly angle-dependent optical response and the resulting solar cells require bulky solar

Fan, Shanhui

238

Digital Photonic Production: High Power ultrashort Lasers, Laser Additive Manufacturing and Laser Micro/ Nano Fabrication  

Science Journals Connector (OSTI)

The high power optical technologies enter a new era: The age of DIGITAL PHOTONIC PRODUCTION. Very recently new lasers in new time- and wavelength domains with high average powers have...

Poprawe, Reinhart; Gillner, Arnold; Hoffmann, Dieter; Kelbassa, Ingomar; Loosen, Peter; Wissenbach, Konrad

239

Packaging and qualification of single photon counting avalanche photodiode focal plane arrays  

E-Print Network (OSTI)

Avalanche Photodiode (APD) photon counting arrays are finding an increasing role in defense applications in laser radar and optical communications. As these system concepts mature, the need for reliable screening, test, ...

Verghese, Simon

240

Winter Term 2013/14 Master Photonics 1. Term Pertsch Bin Hasan Wyrowski Egorov Pertsch  

E-Print Network (OSTI)

Winter Term 2013/14 Master Photonics 1. Term Pertsch Bin Hasan Wyrowski Egorov Pertsch 8.00 - 9 102, Abb. - 1 - modern optics E Fundamentals of Thursday FridayMonday Tuesday Wednesday FlammBin Hasan

Knüpfer, Christian

Note: This page contains sample records for the topic "regional optics photonics" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


241

Large-pitch kagome-structured hollow-core photonic crystal fiber  

Science Journals Connector (OSTI)

We report the fabrication and characterization of a new type of hollow-core photonic crystal fiber based on large-pitch (?12?m) kagome lattice cladding. The optical characteristics...

Couny, F; Benabid, F; Light, P S

2006-01-01T23:59:59.000Z

242

Photon Source Parameters  

NLE Websites -- All DOE Office Websites (Extended Search)

Photon Source Parameters Photon Source Parameters Photon Source Parameters Print Summary Graph of Brightness Curves for All Insertion Devices Insertion Device and Bend Magnet Parameters Bend Magnet Superbend Magnet U30 Undulator U50 Undulator U80 Undulator U100 Undulator W114 Wiggler The ALS has six elliptically polarizing undulators, two in straight 4, two in straight 11, and one each in straights 6 and 7. All are arranged with chicanes so that two such devices can be installed to feed two independent beamlines. They can be used in a variety of polarization modes, including circular, elliptical, horizontal, and vertical. These modes can be chosen by appropriate phasing of the magnet rows. The brightness and flux curves below are shown for horizontal and circular polarization. Curves for elliptical and vertical polarization are similar to the horizontal polarization curve, but the minimum photon energy is higher.

243

Photon-graviton amplitudes  

SciTech Connect

We report on an ongoing study of the one-loop photon-graviton amplitudes, using both effective action and worldline techniques. The emphasis is on Kawai-Lewellen-Tye-like relations.

Ahmadiniaz, N.; Schubert, C. [Instituto de Fsica y Matemticas, Universidad Michoacana de San Nicols de Hidalgo, Edificio C-3, Apdo. Postal 2-82, C.P. 58040, Morelia, Michoacn (Mexico)] [Instituto de Fsica y Matemticas, Universidad Michoacana de San Nicols de Hidalgo, Edificio C-3, Apdo. Postal 2-82, C.P. 58040, Morelia, Michoacn (Mexico); Bastianelli, F. [Dipartimento di Fisica ed Astronomia, Universit di Bologna and INFN, Sezione di Bologna, Via Irnerio 46, I-40126 Bologna (Italy)] [Dipartimento di Fisica ed Astronomia, Universit di Bologna and INFN, Sezione di Bologna, Via Irnerio 46, I-40126 Bologna (Italy); Corradini, O. [Centro de Estudios en Fsica y Matemticas Bsicas y Aplicadas, Universidad Autnoma de Chiapas, C.P. 29000, Tuxtla Gutirrez, Mxico, and Dipartimento di Scienze Fisiche, Informatiche e Matematiche, Universi (Italy)] [Centro de Estudios en Fsica y Matemticas Bsicas y Aplicadas, Universidad Autnoma de Chiapas, C.P. 29000, Tuxtla Gutirrez, Mxico, and Dipartimento di Scienze Fisiche, Informatiche e Matematiche, Universi (Italy); Dvila, Jos M. [Facultad de Ciencias, Universidad Autnoma del Estado de Mxico, Instituto Literario 100, Toluca 50000 (Mexico)] [Facultad de Ciencias, Universidad Autnoma del Estado de Mxico, Instituto Literario 100, Toluca 50000 (Mexico)

2013-07-23T23:59:59.000Z

244

Photons & Fusion Newsletter - 2014  

NLE Websites -- All DOE Office Websites (Extended Search)

Photons & Fusion Newsletter - 2014 May NIF Petawatt Laser Is on the Fast Track to Completion First Isotope-Specific Radiograph Using MEGa-rays Produced NIF&PS Directorate Review...

245

Photon Reconstruction and Identification with the ATLAS detector  

SciTech Connect

The understanding of the photons reconstruction will be one of the key issues at the start-up of data-taking with the ATLAS experiment at the LHC. Large statistics samples of photons produced in association with jets are expected over a wide range of E{sub T}.The photon reconstruction is based on an electromagnetic-cluster-seeded algorithm which classifies as photons those clusters which have no matching prompt track. These are then subdivided into converted or non-converted photon candidates depending on the presence of one or more tracker-reconstructed electron-positron pairs pointing to it. The precise knowledge of the material upstream the calorimeter and a correct treatment of the converted photons are critical for a correct photon reconstruction and identification.The photon identification is based almost entirely on the analysis of the shower shapes in the calorimeter. The goal is to achieve an efficient photon selection in the range from 20 GeV to several hundreds GeV with a rejection of 10{sup 3}-10{sup 4} against QCD jets in the moderate transverse momentum region of 20 to 100 GeV, which is the relevant one for H->gammagamma searches.

Donega, Mauro [Department of Physics and Astronomy-University of Pennsylvania, Philadelphia (United States)

2010-02-10T23:59:59.000Z

246

Novel Birefringent Frequency Discriminator for Microwave Photonic Links  

E-Print Network (OSTI)

NOVEL BIREFRINGENT FREQUENCY DISCRIMINATOR FOR MICROWAVE PHOTONIC LINKS A Dissertation by JAE HYUN KIM Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements for the degree...-Division Multiplexing OPD Optical Path Length Different OVA Optical Vector Network Analyzer PBS Polarization Beam Splitter PM Phase Modulation PD Photodiode PDL Polarization Dependent Loss PLC Planar Lightwave Circuit QWP Quarter Wave Plate RAMZI Ring...

Kim, Jae Hyun

2013-04-22T23:59:59.000Z

247

Photonic Crystal Cavities in Cubic Polytype Silicon Carbide Films  

E-Print Network (OSTI)

We present the design, fabrication, and characterization of high quality factor and small mode volume planar photonic crystal cavities from cubic (3C) thin films (thickness ~ 200 nm) of silicon carbide (SiC) grown epitaxially on a silicon substrate. We demonstrate cavity resonances across the telecommunications band, with wavelengths from 1250 - 1600 nm. Finally, we discuss possible applications in nonlinear optics, optical interconnects, and quantum information science.

Radulaski, Marina; Buckley, Sonia; Rundquist, Armand; Provine, J; Alassaad, Kassem; Ferro, Gabriel; Vu?kovi?, Jelena

2013-01-01T23:59:59.000Z

248

A WDM Silicon Photonic Transmitter based on Carrier-Injection Microring Modulators  

E-Print Network (OSTI)

A WDM Silicon Photonic Transmitter based on Carrier- Injection Microring Modulators Chin-Hui Chen1 photonic transmitter based on carrier-injection type microring modulators. Resonant wavelengths can be adjusted by both thermal heaters and bias tuning. OCIS codes: (200.4650) Optical interconnects; (250

Palermo, Sam

249

Video-Rate Scanning Two-Photon Excitation Fluorescence Microscopy and Ratio Imaging with Cameleons  

E-Print Network (OSTI)

Video-Rate Scanning Two-Photon Excitation Fluorescence Microscopy and Ratio Imaging with Cameleons ABSTRACT A video-rate (30 frames/s) scanning two-photon excitation microscope has been successfully tested 690 to 1050 nm, prechirper optics for laser pulse-width compression, resonant galvanometer for video

Tsien, Roger Y.

250

Invited Paper GaAs/A1O photonic bandgap material fabrication and characterization  

E-Print Network (OSTI)

semiconductor crystals, photonic crystals do not occur naturally. There are, therefore, several seemingly direct bandgap semiconductors, such as GaAs, A1GaAs, InP, InGaAsP, etc., in which the radiative-dimensional photonic bandgaps for microwave and millimeter-wave radiation, and for shorter optical wavelengths in one

Zhou, Weidong

251

Light harvesting by planar photonic crystal in solar cells: The case of amorphous silicon  

E-Print Network (OSTI)

Light harvesting by planar photonic crystal in solar cells: The case of amorphous silicon Guillaume on light management in silicon thin film solar cells, using photonic crystals (PhC) structures. We by means of optical simulations performed on realistic thin film solar cell stacks. Theoretically

Boyer, Edmond

252

Quantum key distribution system in standard telecommunications fiber using a short wavelength single-photon source  

E-Print Network (OSTI)

A demonstration of the principles of quantum key distribution is performed using a single-photon source in a proof of concept test-bed over a distance of 2 km in standard telecommunications optical fiber. The single-photon source was an optically-pumped quantum dot in a microcavity emitting at a wavelength of 895 nm. Characterization of the quantum key distribution parameters was performed at a range of different optical excitation powers. An investigation of the effect of varying the optical excitation power of the quantum dot microcavity on the quantum bit error rate and cryptographic key exchange rate of the system are presented.

R. J. Collins; P. J. Clarke; V. Fernandez; K. J. Gordon; M. N. Makhonin; J. A. Timpson; A. Tahraoui; M. Hopkinson; A. M. Fox; M. S. Skolnick; G. S. Buller

2010-04-27T23:59:59.000Z

253

Design of the First Infrared Beamline at the Siam Photon Laboratory  

SciTech Connect

This report presents the optical design and optical simulations for the first infrared beamline at the Siam Photon Laboratory. The beamline collects the edge radiation and bending magnet radiation, producing from the BM4 bending magnet of the 1.2 GeV storage ring of the Siam Photon Source. The optical design is optimized for the far- to mid-infrared spectral range (4000-100 cm{sup -1}) for microspectroscopic applications. The optical performance has been examined by computer simulations.

Pattanasiriwisawa, W. [Synchrotron Light Research Institute, P.O. Box 93, Muang, Nakhon Ratchasima 30000 (Thailand); Songsiriritthigul, P. [Synchrotron Light Research Institute, P.O. Box 93, Muang, Nakhon Ratchasima 30000 (Thailand); School of Physics, Suranaree University of Technology, Muang, Nakhon Ratchasima 30000 (Thailand); Dumas, P. [SOLEIL Synchrotron, L'Orme des Merisiers, BP48, F-91192 Gif sur Yvette Cedex (France)

2010-06-23T23:59:59.000Z

254

Photonic crystal heterostructures and interfaces  

Science Journals Connector (OSTI)

Photonic crystal heterostructures, like their semiconductor quantum electronic counterparts, generate complex function from simple, well-understood building blocks. They have led to compact photonic crystal-based waveguides and record-quality-factor resonant cavities. Here the progress on the experimental realization of photonic crystal heterostructure devices, and on the development of convenient, intuitive, and computationally efficient models of devices that unite multiple finite-sized photonic crystal media to engineer photon localization and guidance is summarized.

Emanuel Istrate and Edward H. Sargent

2006-05-16T23:59:59.000Z

255

Telecommunications-band heralded single photons from a silicon nanophotonic chip  

E-Print Network (OSTI)

We demonstrate heralded single photon generation in a CMOS-compatible silicon nanophotonic device. The strong modal confinement and slow group velocity provided by a coupled resonator optical waveguide (CROW) produced a large four-wave-mixing nonlinearity coefficient gamma_eff ~4100 W^-1 m^-1 at telecommunications wavelengths. Spontaneous four-wave-mixing using a degenerate pump beam at 1549.6 nm created photon pairs at 1529.5 nm and 1570.5 nm with a coincidence-to-accidental ratio exceeding 20. A photon correlation measurement of the signal (1529.5 nm) photons heralded by the detection of the idler (1570.5 nm) photons showed antibunching with g^(2)(0) = 0.19 \\pm 0.03. The demonstration of a single photon source within a silicon platform holds promise for future integrated quantum photonic circuits.

Marcelo Davanco; Jun Rong Ong; Andrea Bahgat Shehata; Alberto Tosi; Imad Agha; Solomon Assefa; Fengnian Xia; William M. J. Green; Shayan Mookherjea; Kartik Srinivasan

2012-01-12T23:59:59.000Z

256

E-Print Network 3.0 - all-optical miniature atomic Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

Instituut, Quantum Gases and Atom Optics Group Collection: Physics 5 Three-photon-absorption resonance for all-optical atomic clocks Sergei Zibrov,1,2,3,4 Summary:...

257

Thermal photon $v_3$ at LHC from fluctuating initial conditions  

E-Print Network (OSTI)

We calculate the triangular flow parameter $v_3$ of thermal photons for 0--40\\% central collisions of Pb nuclei at LHC using an event-by-event hydrodynamic model with fluctuating initial conditions. Thermal photon $v_3$ with respect to the the participant plane angle is found to be positive and significant compared to the elliptic flow parameter $v_2$ of thermal photons. In addition, photon $v_3$ as a function of $p_T$ shows similar qualitative nature to photon $v_2$ in the region $1< p_T <6$ GeV/$c$. We argue that while $v_3$ originates from $\\epsilon_3$ deformations of the initial state density distribution, fast buildup of radial flow due to fluctuations is the main driving mechanism for the observed large value.

Rupa Chatterjee; Dinesh K. Srivastava; Thorsten Renk

2014-07-31T23:59:59.000Z

258

Thermal-aware Synthesis of Integrated Photonic Ring Resonators  

E-Print Network (OSTI)

Thermal-aware Synthesis of Integrated Photonic Ring Resonators Christopher Condrat Calypto Design-chip optical-interconnect wavelength division multi- plexing (WDM) network architectures. Thermal interactions literature proposes active compensation for such refractive index variations (e.g. carrier-injection based

Kalla, Priyank

259

Highly Confined Photon Transport in Subwavelength Metallic Slot Waveguides  

E-Print Network (OSTI)

was deposited on one side of a free-standing Si3N4 membrane. Using focused ion- beam milling, wire waveguidesHighly Confined Photon Transport in Subwavelength Metallic Slot Waveguides J. A. Dionne,*, H. J and electronic components. Although optical interconnects exhibit a large bandwidth for signal transport, minimum

Atwater, Harry

260

Large area 3D helical photonic crystals A. K. Rauba)  

E-Print Network (OSTI)

.1116/1.3640756] I. INTRODUCTION Chiral, coil-spring-like helical photonic crystal structures are useful for optical the helical lattice periodicity and coil pitch of the 3D PhC. This technique con- sists of a simple two

New Mexico, University of

Note: This page contains sample records for the topic "regional optics photonics" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


261

Towards new states of matter with atoms and photons  

E-Print Network (OSTI)

Towards new states of matter with atoms and photons Jonas Larson Stockholm University and Universität zu Köln Aarhus "Cold atoms and beyond" 26/6-2014 #12;Motivation Optical lattices + control QED = coupling between few material (atomic) and few electromagnetic degrees of freedom. Cavity atom

262

Quantum Optical State Comparison Amplifier  

E-Print Network (OSTI)

It is a fundamental principle of quantum theory that an unknown state cannot be copied or, as a consequence, an unknown optical signal cannot be amplified deterministically and perfectly. Here we describe a protocol that provides nondeterministic quantum optical amplification in the coherent state basis with high gain, high fidelity and which does not use quantum resources. The scheme is based on two mature quantum optical technologies, coherent state comparison and photon subtraction. The method compares favourably with all previous nondeterministic amplifiers in terms of fidelity and success probability.

Electra Eleftheriadou; Stephen M. Barnett; John Jeffers

2013-11-22T23:59:59.000Z

263

Single-Photon Absorption in Coupled Atom-Cavity Systems  

E-Print Network (OSTI)

We show how to capture a single photon of arbitrary temporal shape with one atom coupled to an optical cavity. Our model applies to Raman transitions in three-level atoms with one branch of the transition controlled by a (classical) laser pulse, and the other coupled to the cavity. Photons impinging on the cavity normally exhibit partial reflection, transmission, and/or absorption by the atom. Only a control pulse of suitable temporal shape ensures impedance matching throughout the pulse, which is necessary for complete state mapping from photon to atom. For most possible photon shapes, we derive an unambiguous analytic expression for the shape of this control pulse, and we discuss how this relates to a quantum memory.

Jerome Dilley; Peter Nisbet-Jones; Bruce W. Shore; Axel Kuhn

2012-03-01T23:59:59.000Z

264

Transpiration purged optical probe  

DOE Patents (OSTI)

An optical apparatus for clearly viewing the interior of a containment vessel by applying a transpiration fluid to a volume directly in front of the external surface of the optical element of the optical apparatus. The fluid is provided by an external source and transported by means of an annular tube to a capped end region where the inner tube is perforated. The perforation allows the fluid to stream axially towards the center of the inner tube and then axially away from an optical element which is positioned in the inner tube just prior to the porous sleeve. This arrangement draws any contaminants away from the optical element keeping it free of contaminants. In one of several embodiments, the optical element can be a lens, a viewing port or a laser, and the external source can provide a transpiration fluid having either steady properties or time varying properties.

2004-01-06T23:59:59.000Z

265

Proton emission induced by polarized photons  

E-Print Network (OSTI)

The proton emission induced by polarized photons is studied in the energy range above the giant resonance region and below the pion emission threshold. Results for the 12C, 16O and 40Ca nuclei are presented. The sensitivity of various observables to final state interaction, meson exchange currents and short range correlations is analyzed. We found relevant effects due to the virtual excitation of the $\\Delta$ resonance.

M. Anguiano; G. Co'; A. M. Lallena

2006-08-29T23:59:59.000Z

266

Thermal photons as a quark-gluon plasma thermometer revisited  

E-Print Network (OSTI)

Photons are a penetrating probe of the hot medium formed in heavy-ion collisions, but they are emitted from all collision stages. At photon energies below 2-3 GeV, the measured photon spectra are approximately exponential and can be characterized by their inverse logarithmic slope, often called "effective temperature" $T_\\mathrm{eff}$. Modelling the evolution of the radiating medium hydrodynamically, we analyze the factors controlling the value of $T_\\mathrm{eff}$ and how it is related to the evolving true temperature $T$ of the fireball. We find that at RHIC and LHC energies most photons are emitted from fireball regions with $T{\\,\\sim\\,}T_\\mathrm{c}$ near the quark-hadron phase transition, but that their effective temperature is significantly enhanced by strong radial flow. Although a very hot, high pressure early collision stage is required for generating this radial flow, we demonstrate that the experimentally measured large effective photon temperatures $T_\\mathrm{eff}{\\,>\\,}T_\\mathrm{c}$, taken alone, do not prove that any electromagnetic radiation was actually emitted from regions with true temperatures well above $T_\\mathrm{c}$. We explore tools that can help to provide additional evidence for the relative weight of photon emission from the early quark-gluon and late hadronic phases. We find that the recently measured centrality dependence of the total thermal photon yield requires a larger contribution from late emission than presently encoded in our hydrodynamic model.

Chun Shen; Ulrich W. Heinz; Jean-Francois Paquet; Charles Gale

2014-03-28T23:59:59.000Z

267

Photon Source Parameters  

NLE Websites -- All DOE Office Websites (Extended Search)

Photon Source Parameters Print Photon Source Parameters Print Summary Graph of Brightness Curves for All Insertion Devices Insertion Device and Bend Magnet Parameters Bend Magnet Superbend Magnet U30 Undulator U50 Undulator U80 Undulator U100 Undulator W114 Wiggler The ALS has six elliptically polarizing undulators, two in straight 4, two in straight 11, and one each in straights 6 and 7. All are arranged with chicanes so that two such devices can be installed to feed two independent beamlines. They can be used in a variety of polarization modes, including circular, elliptical, horizontal, and vertical. These modes can be chosen by appropriate phasing of the magnet rows. The brightness and flux curves below are shown for horizontal and circular polarization. Curves for elliptical and vertical polarization are similar to the horizontal polarization curve, but the minimum photon energy is higher.

268

Photon Sciences Training Courses  

NLE Websites -- All DOE Office Websites (Extended Search)

Photon Sciences Training Courses Photon Sciences Training Courses Beamline Ops (BLOSA) BNL Web Courses (Help) BNL Class Schedules Business Systems & Software Contractor Orientation Cranes, Forklifts, Aerial Lifts Electrical Environmental ESH Briefings ESH Tours GERT GERT Reciprocity Human Resources IRP (Briefings) (Procedures) Job Briefings JRAs and FRAs Lasers Lead Machine Shops Medical Surveillance Nano Materials NSLS-II (Bldg 740) Photographic Dark Rm Procedures (Control Rm) Procedures (PRMs) (SOPs) Radiological Remedial (GERT) (NSLS) Roster Form (.docx) R2A2s Source Dev Lab Staff Development Study Guides Supervisory Training Training Course Dev Form User Training Work Control All Photon Sciences (PS) courses and some BNL courses (HP, OM, TQ, and GE) commonly assigned by the PS Directorate for work within PS buildings are

269

Photon Source Parameters  

NLE Websites -- All DOE Office Websites (Extended Search)

Photon Source Parameters Print Photon Source Parameters Print Summary Graph of Brightness Curves for All Insertion Devices Insertion Device and Bend Magnet Parameters Bend Magnet Superbend Magnet U30 Undulator U50 Undulator U80 Undulator U100 Undulator W114 Wiggler The ALS has six elliptically polarizing undulators, two in straight 4, two in straight 11, and one each in straights 6 and 7. All are arranged with chicanes so that two such devices can be installed to feed two independent beamlines. They can be used in a variety of polarization modes, including circular, elliptical, horizontal, and vertical. These modes can be chosen by appropriate phasing of the magnet rows. The brightness and flux curves below are shown for horizontal and circular polarization. Curves for elliptical and vertical polarization are similar to the horizontal polarization curve, but the minimum photon energy is higher.

270

Photon Source Parameters  

NLE Websites -- All DOE Office Websites (Extended Search)

Photon Source Parameters Print Photon Source Parameters Print Summary Graph of Brightness Curves for All Insertion Devices Insertion Device and Bend Magnet Parameters Bend Magnet Superbend Magnet U30 Undulator U50 Undulator U80 Undulator U100 Undulator W114 Wiggler The ALS has six elliptically polarizing undulators, two in straight 4, two in straight 11, and one each in straights 6 and 7. All are arranged with chicanes so that two such devices can be installed to feed two independent beamlines. They can be used in a variety of polarization modes, including circular, elliptical, horizontal, and vertical. These modes can be chosen by appropriate phasing of the magnet rows. The brightness and flux curves below are shown for horizontal and circular polarization. Curves for elliptical and vertical polarization are similar to the horizontal polarization curve, but the minimum photon energy is higher.

271

Photon Source Parameters  

NLE Websites -- All DOE Office Websites (Extended Search)

Photon Source Parameters Print Photon Source Parameters Print Summary Graph of Brightness Curves for All Insertion Devices Insertion Device and Bend Magnet Parameters Bend Magnet Superbend Magnet U30 Undulator U50 Undulator U80 Undulator U100 Undulator W114 Wiggler The ALS has six elliptically polarizing undulators, two in straight 4, two in straight 11, and one each in straights 6 and 7. All are arranged with chicanes so that two such devices can be installed to feed two independent beamlines. They can be used in a variety of polarization modes, including circular, elliptical, horizontal, and vertical. These modes can be chosen by appropriate phasing of the magnet rows. The brightness and flux curves below are shown for horizontal and circular polarization. Curves for elliptical and vertical polarization are similar to the horizontal polarization curve, but the minimum photon energy is higher.

272

E-Print Network 3.0 - anatomical optical coherence Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

Laryngoscope Lippincott Williams & Wilkins Summary: Imaged With Optical Coherence Tomography by Anatomic Regions and Subsites. Anatomic Regions Locations... and Otological...

273

On the sub-band gap optical absorption in heat treated cadmium sulphide thin film deposited on glass by chemical bath deposition technique  

SciTech Connect

The sub-band gap optical absorption in chemical bath deposited cadmium sulphide thin films annealed at different temperatures has been critically analyzed with special reference to Urbach relation. It has been found that the absorption co-efficient of the material in the sub-band gap region is nearly constant up to a certain critical value of the photon energy. However, as the photon energy exceeds the critical value, the absorption coefficient increases exponentially indicating the dominance of Urbach rule. The absorption coefficients in the constant absorption region and the Urbach region have been found to be sensitive to annealing temperature. A critical examination of the temperature dependence of the absorption coefficient indicates two different kinds of optical transitions to be operative in the sub-band gap region. After a careful analyses of SEM images, energy dispersive x-ray spectra, and the dc current-voltage characteristics, we conclude that the absorption spectra in the sub-band gap domain is possibly associated with optical transition processes involving deep levels and the grain boundary states of the material.

Chattopadhyay, P.; Karim, B.; Guha Roy, S. [Department of Electronic Science, University of Calcutta, 92, A.P.C. Road, Kolkata 700009 (India)

2013-12-28T23:59:59.000Z

274

Magneto-tunable one-dimensional graphene-based photonic crystal  

SciTech Connect

We investigate the effect of a perpendicular static magnetic field on the optical bandgap of a one-dimensional (1D) graphene-dielectric photonic crystal in order to examine the possibility of reaching a rich tunable photonic bandgap. The solution of the wave equation in the presence of the anisotropic Hall situation suggests two decoupled circularly polarized wave each exhibiting different degrees of bandgap tunability. It is also numerically demonstrated that applying different values of field intensity lead to perceptible changes in photonic bandgap of such a structure. Finally, the effect of opening a finite electronic gap in the spectrum of graphene on the optical dispersion solution of such a 1D photonic crystal is reported. It is shown that increasing the value of the electronic gap results in the shrinkage of the associated photonic bandgaps.

Jahani, D., E-mail: dariush110@gmail.com; Soltani-Vala, A., E-mail: asoltani@tabrizu.ac.ir; Barvestani, J.; Hajian, H. [Department of Solid State Physics, Faculty of Physics, University of Tabriz, Tabriz (Iran, Islamic Republic of)

2014-04-21T23:59:59.000Z

275

Full Quantum Analysis of Two-Photon Absorption Using Two-Photon Wavefunction: Comparison with One-Photon Absorption  

E-Print Network (OSTI)

For dissipation-free photon-photon interaction at the single photon level, we analyze one-photon transition and two-photon transition induced by photon pairs in three-level atoms using two-photon wavefunctions. We show that the two-photon absorption can be substantially enhanced by adjusting the time correlation of photon pairs. We study two typical cases: Gaussian wavefunction and rectangular wavefunction. In the latter, we find that under special conditions one-photon transition is completely suppressed while the high probability of two-photon transition is maintained.

Toshihiro Nakanishi; Hirokazu Kobayashi; Kazuhiko Sugiyama; Masao Kitano

2009-06-01T23:59:59.000Z

276

Deterministic source of a train of indistinguishable single-photon pulses with single-atom-cavity system  

E-Print Network (OSTI)

We present a mechanism to produce indistinguishable single-photon pulses on demand from an optical cavity. The sequences of two laser pulses generate, at the two Raman transitions of a four-level atom, the same cavity-mode photons without repumping of the atom between photon generations. Photons are emitted from the cavity with near-unit efficiency in well-defined temporal modes of identical shapes controlled by the laser fields. The second order correlation function reveals the single-photon nature of the proposed source. A realistic setup for the experimental implementation is presented.

A. Gogyan; S. Gurin; H. -R. Jauslin; Yu. Malakyan

2010-05-01T23:59:59.000Z

277

Quantum spatial superresolution by optical centroid measurements  

E-Print Network (OSTI)

Quantum lithography (QL) has been suggested as a means of achieving enhanced spatial resolution for optical imaging, but its realization has been held back by the low multi-photon detection rates of recording materials. Recently, an optical centroid measurement (OCM) procedure was proposed as a way to obtain spatial resolution enhancement identical to that of QL but with higher detection efficiency (M. Tsang, Phys. Rev. Lett. 102, 253601, 2009). Here we describe a variation of the OCM method with still higher detection efficiency based on the use of photon-number-resolving detection. We also report laboratory results for two-photon interference. We compare these results with those of the standard QL method based on multi-photon detection and show that the new method leads to superresolution but with higher detection efficiency.

Heedeuk Shin; Kam Wai Clifford Chan; Hye Jeong Chang; Robert W. Boyd

2011-05-11T23:59:59.000Z

278

Design of all-optical high-order temporal integrators based on multiple-phase-shifted Bragg gratings  

Science Journals Connector (OSTI)

In exact analogy with their electronic counterparts, photonic temporal integrators are fundamental building blocks for constructing all-optical circuits for ultrafast information...

Asghari, Mohammad H; Azaa, Jos

2008-01-01T23:59:59.000Z

279

Hybrid laser with CMOS photonics  

E-Print Network (OSTI)

In this thesis, an interesting approach for a photonic laser source is presented. By using integrated photonic resonators with an external gain medium, we are able to build a laser that offers a number of advantages including ...

Chong, Johanna S

2014-01-01T23:59:59.000Z

280

PHYSICAL REVIEW A 86, 053834 (2012) Axiomatic geometrical optics, Abraham-Minkowski controversy,  

E-Print Network (OSTI)

of linear waves of arbitrary nature. B. Field-theoretical approach Before photon properties canPHYSICAL REVIEW A 86, 053834 (2012) Axiomatic geometrical optics, Abraham-Minkowski controversy optics within the field-theoretical approach, the classical concept of a photon (and, more generally, any

Note: This page contains sample records for the topic "regional optics photonics" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


281

Quantum noise in optical interferometers  

SciTech Connect

We study the photon counting noise in optical interferometers used for gravitational wave detection. In order to reduce quantum noise, a squeezed vacuum is injected into the usually unused input port. It is investigated under which conditions the gravitational wave signal may be amplified without increasing counting noise concurrently. Such a possibility was suggested as a consequence of the entanglement of the two output ports of a beam splitter. We find that amplification without concurrent increase of noise is not possible for reasonable squeezing parameters. Photon distributions for various beam splitter angles and squeezing parameters are calculated.

Voronov, Volodymyr G.; Weyrauch, Michael [Faculty of Physics, Taras Shevchenko National University of Kyiv, 03022 Kyiv (Ukraine); Physikalisch-Technische Bundesanstalt, D-38116 Braunschweig (Germany)

2010-05-15T23:59:59.000Z

282

Strain-tunable Photonic Band Gap Microcavity Waveguides in Silicon at 1.55 m  

E-Print Network (OSTI)

+ , Sang-Gook Kim+ * Columbia University, New York, NY 10027 + Massachusetts Institute of Technology for reconfiguration of the optical characteristics based on user-demand, but also for compensation against external the Optical Response of Photonic Bandgap Structures, edited by Philippe M. Fauchet, Paul V. Braun, Proceedings

283

Resonantly pumped optical pumping injection cavity lasers  

E-Print Network (OSTI)

An optical parametric oscillator is tuned to the resonance wavelength of the etalon in an optical pumping injection cavity (OPIC) laser with a type-II "W" active region, thereby minimizing the threshold pump intensity and ...

Santilli, Michael Robert; McAlpine, T. C.; Greene, K. R.; Olafsen, L. J.; Bewley, W. W.; Felix, C. L.; Vurgaftman, I.; Meyer, J. R.; Lee, H.; Martinelli, R. U.

2004-11-01T23:59:59.000Z

284

Optical gating of perylene bisimide fluorescence using dithienylcyclopentene photochromic switches  

SciTech Connect

The emission of millions of fluorescence photons from a chromophore is controlled by the absorption of a few tens of photons in a photochromic molecule. The parameters that determine the efficiency of this process are investigated, providing insights for the development of an all-optical gate.

Prs, Martti; Khler, Jrgen, E-mail: juergen.koehler@uni-bayreuth.de [Experimental Physics IV, University of Bayreuth, 95440 Bayreuth (Germany)] [Experimental Physics IV, University of Bayreuth, 95440 Bayreuth (Germany); Grf, Katja; Bauer, Peter; Thelakkat, Mukundan [Applied Functional Polymers, University of Bayreuth, 95440 Bayreuth (Germany)] [Applied Functional Polymers, University of Bayreuth, 95440 Bayreuth (Germany)

2013-11-25T23:59:59.000Z

285

A picogram and nanometer scale photonic crystal opto-mechanical cavity  

E-Print Network (OSTI)

We describe the design, fabrication, and measurement of a cavity opto-mechanical system consisting of two nanobeams of silicon nitride in the near-field of each other, forming a so-called "zipper" cavity. A photonic crystal patterning is applied to the nanobeams to localize optical and mechanical energy to the same cubic-micron-scale volume. The picrogram-scale mass of the structure, along with the strong per-photon optical gradient force, results in a giant optical spring effect. In addition, a novel damping regime is explored in which the small heat capacity of the zipper cavity results in blue-detuned opto-mechanical damping.

Eichenfield, M; Chan, J; Vahala, K J; Painter, O

2008-01-01T23:59:59.000Z

286

Photonic-band-gap effects in two-dimensional polycrystalline and amorphous structures  

SciTech Connect

We study numerically the density of optical states (DOS) in two-dimensional photonic structures with short-range positional order and observe a transition from polycrystalline to amorphous photonic systems. In polycrystals, photonic band gaps (PBGs) are formed within individual domains, which leads to a depletion of the DOS similar to that in periodic structures. In amorphous photonic media, the domain sizes are too small to form PBGs, thus the depletion of the DOS is weakened significantly. The critical domain size that separates the polycrystalline and amorphous regimes is determined by the attenuation length of Bragg scattering, which depends not only on the degree of positional order but also the refractive-index contrast of the photonic material. Even with relatively low-refractive-index contrast, we find that modest short-range positional order in photonic structures enhances light confinement via collective scattering and interference.

Yang, Jin-Kyu; Noh, Heeso; Liew, Seng-Fatt [Department of Applied Physics, Yale University, New Haven, Connecticut 06520-8482 (United States); Schreck, Carl [Department of Physics, Yale University, New Haven, Connecticut 06520-8120 (United States); Guy, Mikhael I. [Science and Research Software Core, Yale University, New Haven, Connecticut 06520-8286 (United States); O'Hern, Corey S. [Department of Mechanical Engineering and Materials Science, Yale University, New Haven, Connecticut 06520-8286 (United States); Department of Physics, Yale University, New Haven, Connecticut 06520-8120 (United States); Cao, Hui [Department of Applied Physics, Yale University, New Haven, Connecticut 06520-8482 (United States); Department of Physics, Yale University, New Haven, Connecticut 06520-8120 (United States)

2010-11-15T23:59:59.000Z

287

Spatial solitons in two-photon photorefractive media  

SciTech Connect

We provide a theory for spatial solitons due to the two-photon photorefractive effect based on the Castro-Camus model [Opt. Lett. 28, 1129 (2003)]. We present the evolution equation of one-dimensional spatial solitons in two-photon photorefractive media. In steady state and under appropriate external bias conditions, we obtain the dark and bright soliton solutions of the optical wave evolution equation, and also discuss the self-deflection of the bright solitons theoretically by taking into account the diffusion effect.

Hou Chunfeng; Pei Yanbo; Zhou Zhongxiang; Sun Xiudong [Department of Physics, Harbin Institute of Technology, Harbin 150001 (China)

2005-05-15T23:59:59.000Z

288

Nanotechnology and Quasicrystals: From self assembly to photonic applications  

E-Print Network (OSTI)

After providing a concise overview on quasicrystals and their discovery more than a quarter of a century ago, I consider the unexpected interplay between nanotechnology and quasiperiodic crystals. Of particular relevance are efforts to fabricate artificial functional micro- or nanostructures, as well as efforts to control the self-assembly of nanostructures, where current knowledge about the possibility of having long-range order without periodicity can provide significant advantages. I discuss examples of systems ranging from artificial metamaterials for photonic applications, through self-assembled soft matter, to surface waves and optically-induced nonlinear photonic quasicrystals.

Ron Lifshitz

2008-10-28T23:59:59.000Z

289

Photon Sciences | Lectures & Seminars  

NLE Websites -- All DOE Office Websites (Extended Search)

Photon Sciences Events Photon Sciences Events Upcoming Events There are no events scheduled at this time. Past Events National Synchrotron Light Source Lunch Time Seminar "Electric-field driven magnetism in thin films" Presented by Dr. Mikhail Zhernenkov, Photon Sciences Directorate, BNL Friday, November 22, 2013, 12 pm Seminar Room, Bldg. 725 Hosted by: Dario Arena and Klaus Attenkofer Photon Sciences Town Meeting Monday, November 18, 2013, 1 pm Seminar Room, Bldg. 725 Photon Sciences Town Meeting on Monday, November 18th The Photon Sciences staff and user community are invited to a Town Meeting on Monday, November 18, from 1-3 p.m. in the NSLS Seminar Room, Bldg. 725. Agenda: Discovery Park, NSLS equipment disposition, Photon Sciences update, and safety and machine updates. Watch live webcast starting at 1 p.m. at

290

To Photon Concept and to Physics of Quantum Absorption Process  

E-Print Network (OSTI)

The status of the photon in the modern physics was analysed. Within the frames of the Standard Model of particle physics the photon is considered to be the genuine elementary particle, being to be the messenger of the electromagnetic interaction to which are subject charged particles. In contrast, the experts in quantum electodynamics (in particular, in quantum optics) insist, that the description of an photon to be the particle is impossible. The given viewpoint was carefully analysed and its falseness was proved. The expression for a photon wave function is presented. So, the status of the photon in quantum electodynamics was restored. The physics of a quantum absorption process is analysed. It is argued in accordance with Dirac guess, that the photon revival takes place by its absorption. Being to be a soliton, it seems to be keeping safe after an energy absorption in a pinned state, possessing the only by spin. It is shown, that the time of the transfer of absorbing systems in an excited state is finite and moreover, that it can govern the stationary signal registered. The given result is significant for the all stationary spectroscopy, in which at present the transfer of absorbing systems in an excited state is considered to be instantaneous.

Dmitri Yerchuck; Yauhen Yerchak; Alla Dovlatova; Vyacheslav Stelmakh; Felix Borovik

2014-06-03T23:59:59.000Z

291

Polarization observables from the photoproduction of omega-mesons using linearly polarized photons  

SciTech Connect

We report on the photon beam asymmetry, {Sigma}, of the {omega} meson decaying into {pi}{sup +}, {pi}{sup -}, {pi}{sup 0} using a beam of linearly polarized photons in the photon energy region of E{sub {gamma}} = 1.9 GeV. These preliminary results are from the summer 2005 g8b dataset, which were collected with the CLAS detector in Hall B of Jefferson Lab.

D. Martinez, P.L. Cole, CLAS Collaboration

2012-04-01T23:59:59.000Z

292

PINIP based high-speed high-extinction ratio micron-size silicon electro-optic modulator  

E-Print Network (OSTI)

-Optics, Technical Digest (CD) (Optical Society of America, 2007), CMG1. 7. G. Gunn, "CMOS photonicsTM - SOI learns 2-4, (2002), 802-805 11. SILVACO International, 4701 Patrick Henry Drive, Bldg. 1, Santa Clara, CA

Lipson, Michal

293

Integrated optical tamper sensor with planar waveguide  

DOE Patents (OSTI)

A monolithic optical tamper sensor, comprising an optical emitter and detector, connected by an optical waveguide and placed into the critical entry plane of an enclosed sensitive region, the tamper sensor having a myriad of scraps of a material optically absorbent at the wavelength of interest, such that when the absorbent material is in place on the waveguide, an unique optical signature can be recorded, but when entry is attempted into the enclosed sensitive region, the scraps of absorbent material will be displaced and the optical/electrical signature of the tamper sensor will change and that change can be recorded.

Carson, R.F.; Casalnuovo, S.A.

1993-01-05T23:59:59.000Z

294

Welcome | Advanced Photon Source  

NLE Websites -- All DOE Office Websites (Extended Search)

Welcome Welcome Aerial view of APS Aerial view of the APS Welcome to the Advanced Photon Source (APS) at Argonne National Laboratory. Whether you are a current or potential scientific user of our unique facility or are simply interested in learning more about the APS, we are delighted that you are visiting our website. The APS is funded by the Office of Science, Office of Basic Energy Sciences in the U.S. Department of Energy. We operate a National User Facility that is open to everyone who has a need for extremely brilliant x-ray photon beams. The APS is one of the most technologically complex machines in the world. This premier national research facility provides the brightest x-ray beams in the Western Hemisphere to more than 5,000 (and growing) scientists from

295

Photon Sciences Training Courses  

NLE Websites -- All DOE Office Websites (Extended Search)

Photon Sciences Training & Qualification Requirements for Accelerator Photon Sciences Training & Qualification Requirements for Accelerator Operators Medical Surveillance BNL Web-Based Training (BNL) Web-Based Training (PSD) Web-Based Training (Help) Instructor-Led Training (BNL) Instructor-Led Training (PSD) Other Training Instructions Medical Surveillance Print the forms and follow the instructions to satisfy the requirement. Web-Based Training Complete the course online. Training credit is entered immediately into the trainee's training history on successful completion of the course. Instructor-Led Training Training is in-person and led by an instructor. Training may be in the form of a briefing, tour, classroom training, hands-on training, event scenario, and may require an exam. Click on the icon for the instructor's name.

296

Overview | Advanced Photon Source  

NLE Websites -- All DOE Office Websites (Extended Search)

APS Overview: APS Overview: Introduction APS Systems Map LINAC Booster Synchrotron Storage Ring Insertion Devices Experiment Hall LOMs & Beamlines Overview of the APS The Advanced Photon Source (APS) at the U.S. Department of Energy's Argonne National Laboratory provides this nation's (in fact, this hemisphere's) brightest storage ring-generated x-ray beams for research in almost all scientific disciplines. Photo: Aerial Photo of APS Aerial photo of the Advanced Photon Source These x-rays allow scientists to pursue new knowledge about the structure and function of materials in the center of the Earth and in outer space, and all points in between. The knowledge gained from this research can impact the evolution of combustion engines and microcircuits, aid in the development of new pharmaceuticals, and pioneer nanotechnologies whose

297

Advanced Photon Source  

NLE Websites -- All DOE Office Websites (Extended Search)

Tomography Interest Group Contact: Robert Winarski, Center for Nanoscale Materials winarski@anl.gov Contact: Francesco De Carlo, Advanced Photon Source decarlo@aps.anl.gov The tomography special interest group of the Advanced Photon Source (APS) at Argonne National Laboratory has been created to promote awareness of the tomography facilities at the APS and to foster communications between the various research groups. Through this group, we believe we can build a strong user community for tomography. The following beamlines have active tomography research programs: 2-BM-B (XOR) http://www.aps.anl.gov/Xray_Science_Division/Xray_Microscopy_and_Imaging/Science_and_Research/Techniques/Tomography/index.html Information about the beamline: http://beam.aps.anl.gov/pls/apsweb/beamline_display_pkg.display_beamline?p_beamline_num_c=31

298

Photon Sciences | Contacts  

NLE Websites -- All DOE Office Websites (Extended Search)

Contact Us Contact Us User Administration Postal Address User Administration Office Brookhaven National Laboratory 75 Brookhaven Avenue, Bldg. 725B Upton, NY 11973-5000 USA Office Hours Monday through Friday, 8:00 a.m. - 4:30 p.m. Check In All new and returning users must personally check in at Brookhaven National Laboratory's Guests, Users, and Visitors (GUV) Center. The GUV Center is located on the first floor in Bldg. 400, on Brookhaven Avenue diagonally across from Berkner Hall. Phone Number 631.344.8737 Fax Number 631.344.7206 Email Address nslsuser@bnl.gov Email is retrieved daily Monday through Friday. Responses to requests or information are made the same or next day. Communications Office Email a question or comment to the Photon Sciences Directorate. Postal Address Photon Sciences Directorate

299

Posters | Advanced Photon Source  

NLE Websites -- All DOE Office Websites (Extended Search)

Your Cart (0 Posters) Your Cart (0 Posters) Your cart is empty. checkout Subtotal: $0.00 update empty Posters Order a printed APS poster! 11 in. x 17 in. prints will be mailed in the order requests are received. 36 in. x 36 in. posters will be sent to school addresses once all orders are processed. The Advanced Photon Source Is The Advanced Photon Source Is Qty: 1 add to cart Technologies from Materials Science Technologies from Materials Science Qty: 1 add to cart Materials Under Extreme Pressure Materials Under Extreme Pressure Qty: 1 add to cart Biological Macromolecules in Action Biological Macromolecules in Action Qty: 1 add to cart Journey to the Center of the Earth Journey to the Center of the Earth Qty: 1 add to cart Earthshaking Monitor Earthshaking Monitor Qty: 1 add to cart Imaging with X-rays

300

Thermally induced photon splitting  

E-Print Network (OSTI)

We calculate thermal corrections to the non-linear QED effective action for low-energy photon interactions in a background electromagnetic field. The high-temperature expansion shows that at $T \\gg m$ the vacuum contribution is exactly cancelled to all orders in the external field except for a non-trivial two-point function contribution. The high-temperature expansion derived reveals a remarkable cancellation of infrared sensitive contributions. As a result photon-splitting in the presence of a magnetic field is suppressed in the presence of an electron-positron QED-plasma at very high temperatures. In a cold and dense plasma a similar suppression takes place. At the same time Compton scattering dominates for weak fields and the suppression is rarely important in physical situations.

Per Elmfors; Bo-Sture Skagerstam

1998-02-23T23:59:59.000Z

Note: This page contains sample records for the topic "regional optics photonics" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


301

Advanced Photon Source  

NLE Websites -- All DOE Office Websites (Extended Search)

0 Advanced Photon Source 0 Advanced Photon Source A U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences national synchrotron x-ray research facility Search Button About Welcome Overview Visiting the APS Mission & Goals Find People Organization Charts Committees Job Openings User Information Prospective Users New Users Current Users APS User Portal Macromolecular Crystallographers Administrators Find a Beamline Apply for Beam Time Contacts Calendars Community Scientific Access Site Access Training Science & Education Science & Research Highlights Conferences Seminars Publications Annual Reports APS Upgrade Courses and Schools Graduate Programs Scientific Software Media Center Calendar of Events APS News User News Argonne/APS Press Releases Argonne/APS Feature Stories Argonne/APS In The News

302

Photonics.com Spectra Home Technology World Innovative Products Business World Presstime Bulletin Article Abstracts Microscopy Focus | June 2007  

E-Print Network (OSTI)

-Optical Science and Email Article Printer Friendly Save Article Enter search term Entire SiteExplore Photonics microscopy offers the highest resolution possible for this search, but the technique has difficulty imaging

Rogers, John A.

303

Jet and Photon Physics  

E-Print Network (OSTI)

Jet production in proton-proton collisions is one of the main phenomenological predictions of QCD. The ATLAS and CMS Collaborations have performed measurements of several jet observables at the LHC and compared their results to theoretical predictions and event generators. Useful physics input for the determination of the parton distribution functions and the strong coupling constant is provided. Photon production measurements represent another important test of QCD and show strong sensitivity to higher-order corrections.

Peruzzi, Marco

2014-01-01T23:59:59.000Z

304

Jet and photon physics  

E-Print Network (OSTI)

Jet production in proton-proton collisions is one of the main phenomenological predictions of QCD. The ATLAS and CMS Collaborations have performed measurements of several jet observables at the LHC and compared their results to theoretical predictions and event generators. Useful physics input for the determination of the parton distribution functions and the strong coupling constant is provided. Photon production measurements represent another important test of QCD and show strong sensitivity to higher-order corrections.

Marco Peruzzi; for the ATLAS; CMS Collaborations

2014-09-30T23:59:59.000Z

305

Advanced silicon photonic modulators  

E-Print Network (OSTI)

Various electrical and optical schemes used in Mach-Zehnder (MZ) silicon plasma dispersion effect modulators are explored. A rib waveguide reverse biased silicon diode modulator is designed, tested and found to operate at ...

Sorace, Cheryl M

2010-01-01T23:59:59.000Z

306

Method and apparatus for optical phase error correction  

DOE Patents (OSTI)

The phase value of a phase-sensitive optical device, which includes an optical transport region, is modified by laser processing. At least a portion of the optical transport region is exposed to a laser beam such that the phase value is changed from a first phase value to a second phase value, where the second phase value is different from the first phase value. The portion of the optical transport region that is exposed to the laser beam can be a surface of the optical transport region or a portion of the volume of the optical transport region. In an embodiment of the invention, the phase value of the optical device is corrected by laser processing. At least a portion of the optical transport region is exposed to a laser beam until the phase value of the optical device is within a specified tolerance of a target phase value.

DeRose, Christopher; Bender, Daniel A.

2014-09-02T23:59:59.000Z

307

1993 CAT workshop on beamline optical designs  

SciTech Connect

An Advanced Photon Source (APS) Collaborative Access Team (CAT) Workshop on Beamline Optical Designs was held at Argonne National Laboratory on July 26--27, 1993. The goal of this workshop was to bring together experts from various synchrotron sources to provide status reports on crystal, reflecting, and polarizing optics as a baseline for discussions of issues facing optical designers for CAT beamlines at the APS. Speakers from the European Synchrotron Radiation Facility (ESRF), the University of Chicago, the National Synchrotron Light Source, and the University of Manchester (England) described single- and double-crystal monochromators, mirrors, glass capillaries, and polarizing optics. Following these presentations, the 90 participants divided into three working groups: Crystal Optics Design, Reflecting Optics, and Optics for Polarization Studies. This volume contains copies of the presentation materials from all speakers, summaries of the three working groups, and a ``catalog`` of various monochromator designs.

Not Available

1993-11-01T23:59:59.000Z

308

D H Saxon. EPS Aachen, July 2003 1 Prompt photon production with  

E-Print Network (OSTI)

D H Saxon. EPS Aachen, July 2003 1 Prompt photon production with associated jets at HERA D H Saxon) with comparison to NLO calculations Both based on full data set 1996-2000 > 100 pb-1 #12;D H Saxon. EPS Aachen. EPS Aachen, July 2003 3 Kinematic region Prompt photon + jet ZEUS photoprod'n (old) -1.5

309

Status of soft photons in experiment E855  

SciTech Connect

Experiment E855 was carried out at the AGS at Brookhaven National Laboratory to study soft photon production near center of mass rapidity Y{sub cm} {approximately} 0 in proton-nucleus collisions at 10 at 18 GeV/c. This was the first dedicated experiment to study this phenomenon at these lower energies. It is important to note that the related process of low mass dilepton pair production has been studied extensively at these energies and an excess signal of dileptons above known hadronic backgrounds has been firmly established. E855 was designed to measure photon production from P{sub t} {approximately} 5 MeV/c up to several GeV/c. A search will be made for an excess of soft photons in the P{sub t} region below the Jacobian peak from {pi}{sup 0} decays, above that which is expected from hadronic bremsstrahlung. Any observed signal will be correlated with the total charged multiplicity in the event in order to determine its production mechanism. This correlation can be used to distinguish purely hadronic sources of soft photons, such as mesons decays and bremsstrahlung, which vary linearly with the charged multiplicity, and a thermal source of soft photons which would exhibit a quadratic dependence on the charged multiplicity. In addition, E855 will measure low energy photons from nuclear decays which can be a background for measuring soft photons near Y{sub cm} {approximately} 0. These photons are also interesting from a nuclear physics point of view, since the spectrum of photons from nuclei excited by incident high energy protons gives a measure of the temperature of the excited nucleus and the amount of excitation energy which can be transferred to a nucleus in a high energy proton collision.

Woody, C.; Lissauer, D. (Brookhaven National Lab., Upton, NY (USA)); Gomez del Campo, J.; Ray, A.; Shapira, D.; Tincknell, M. (Oak Ridge National Lab., TN (USA)); Clark, R. (Vanderbilt Univ., Nashville, TN (USA)); Erd, C.; Schukraft, J.; Willis, W. (European Organization for Nuclear Research, Geneva (Switzerland))

1990-01-01T23:59:59.000Z

310

Electron-atom source as a primary radiometric standard for the EUV spectral region  

Science Journals Connector (OSTI)

A compact, portable radiometric standard for the EUV wavelength region utilizing single photon counting is described. An energetic beam of electrons is passed through a thin atomic or...

Risley, John S; Westerveld, W B

1989-01-01T23:59:59.000Z

311

Laser photon merging in proton-laser collisions  

E-Print Network (OSTI)

The quantum electrodynamical vacuum polarization effects arising in the collision of a high-energy proton beam and a strong, linearly polarized laser field are investigated. The probability that laser photons merge into one photon by interacting with the proton`s electromagnetic field is calculated taking into account the laser field exactly. Asymptotics of the probability are then derived according to different experimental setups suitable for detecting perturbative and nonperturbative vacuum polarization effects. The experimentally most feasible setup involves the use of a strong optical laser field. It is shown that in this case measurements of the polarization of the outgoing photon and and of its angular distribution provide promising tools to detect these effects for the first time.

A. Di Piazza; K. Z. Hatsagortsyan; C. H. Keitel

2009-06-30T23:59:59.000Z

312

Improving the fidelity of optical Zeno gates via distillation  

SciTech Connect

We have modeled the Zeno effect controlled-sign gate of Franson et al. [Phys. Rev. A 70, 062302 (2004)] and shown that high two-photon to one-photon absorption ratios, {kappa}, are needed for high fidelity free-standing operation. Hence we instead employ this gate for cluster state fusion, where the requirement for {kappa} is less restrictive. With the help of partially offline one-photon and two-photon distillations, we can achieve a fusion gate with unity fidelity but nonunit probability of success. We conclude that for {kappa}>2200, the Zeno fusion gate will out perform the equivalent linear optics gate.

Leung, Patrick M.; Ralph, Timothy C. [Centre for Quantum Computer Technology, Department of Physics, University of Queensland, Brisbane 4072 (Australia)

2006-12-15T23:59:59.000Z

313

Nonlocal Modulation of Entangled Photons  

E-Print Network (OSTI)

We consider ramifications of the use of high speed light modulators to questions of correlation and measurement of time-energy entangled photons. Using phase modulators, we find that temporal modulation of one photon of an entangled pair, as measured by correlation in the frequency domain, may be negated or enhanced by modulation of the second photon. Using amplitude modulators we describe a Fourier technique for measurement of biphoton wave functions with slow detectors.

S. E. Harris

2008-08-06T23:59:59.000Z

314

Fiber optic detector for immuno-testing  

DOE Patents (OSTI)

A portable fiber optic detector that senses the presence of specific target chemicals in air or a gas by exchanging the target chemical for a fluoroescently-tagged antigen that is bound to an antibody which is in turn attached to an optical fiber. Replacing the fluorescently-tagged antigen reduces the fluorescence so that a photon sensing detector records the reduced light level and activates an appropriate alarm or indicator.

Partin, Judy K. (Idaho Falls, ID); Ward, Thomas E. (Idaho Falls, ID); Grey, Alan E. (Idaho Falls, ID)

1992-01-01T23:59:59.000Z

315

Photon Science for Renewable Energy  

E-Print Network (OSTI)

Photon Science for renewable Energy at Light-Sourceour planet. The quest for renewable, nonpolluting sources ofa global revolution in renewable and carbon- neutral energy

Hussain, Zahid

2010-01-01T23:59:59.000Z

316

Silicon Photonic Components and Networks  

Science Journals Connector (OSTI)

Significant progress in silicon photonics has led to flattop filters, polarization independence, low power modulators and switches, and low dark current germanium detectors. Future...

Watts, Michael

317

Video Library | Advanced Photon Source  

NLE Websites -- All DOE Office Websites (Extended Search)

Video Library Related Links: APS Colloquium APS Podcasts APS Today More videos: Introduction to the APS Physics of the Blues Now Playing: Building the Advanced Photon Source This...

318

Thermodynamics of quantum photon spheres  

Science Journals Connector (OSTI)

Photon spheres, surfaces where massless particles are confined in closed orbits, are expected to be common astrophysical structures surrounding ultracompact objects. In this paper a semiclassical treatment of a photon sphere is proposed. We consider the quantum Maxwell field and derive its energy spectra. A thermodynamic approach for the quantum photon sphere is developed and explored. Within this treatment, an expression for the spectral energy density of the emitted radiation is presented. Our results suggest that photon spheres, when thermalized with their environment, have nonusual thermodynamic properties, which could lead to distinct observational signatures.

M.?C. Baldiotti; Walace S. Elias; C. Molina; Thiago S. Pereira

2014-11-19T23:59:59.000Z

319

Golden Photon | Open Energy Information  

Open Energy Info (EERE)

for Others) for this property. Partnering Center within NREL National Center for Photovoltaics Partnership Year 1991 Golden Photon is a company located in Golden, CO. References...

320

Photonic quantum walk in a single beam with twisted light  

E-Print Network (OSTI)

Inspired by the classical phenomenon of random walk, the concept of quantum walk has emerged recently as a powerful platform for the dynamical simulation of complex quantum systems, entanglement production and universal quantum computation. Such a wide perspective motivates a renewing search for efficient, scalable and stable implementations of this quantum process. Photonic approaches have hitherto mainly focused on multi-path schemes, requiring interferometric stability and a number of optical elements that scales quadratically with the number of steps. Here we report the experimental realization of a quantum walk taking place in the orbital angular momentum space of light, both for a single photon and for two simultaneous indistinguishable photons. The whole process develops in a single light beam, with no need of interferometers, and requires optical resources scaling linearly with the number of steps. Our demonstration introduces a novel versatile photonic platform for implementing quantum simulations, based on exploiting the transverse modes of a single light beam as quantum degrees of freedom.

Filippo Cardano; Francesco Massa; Ebrahim Karimi; Sergei Slussarenko; Domenico Paparo; Corrado de Lisio; Fabio Sciarrino; Enrico Santamato; Lorenzo Marrucci

2014-03-19T23:59:59.000Z

Note: This page contains sample records for the topic "regional optics photonics" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


321

Tapered fiber coupling of single photons emitted by a deterministically positioned single nitrogen vacancy center  

SciTech Connect

A diamond nano-crystal hosting a single nitrogen vacancy (NV) center is optically selected with a confocal scanning microscope and positioned deterministically onto the subwavelength-diameter waist of a tapered optical fiber (TOF) with the help of an atomic force microscope. Based on this nano-manipulation technique, we experimentally demonstrate the evanescent coupling of single fluorescence photons emitted by a single NV-center to the guided mode of the TOF. By comparing photon count rates of the fiber-guided and the free-space modes and with the help of numerical finite-difference time domain simulations, we determine a lower and upper bound for the coupling efficiency of (9.5??0.6)% and (10.4??0.7)%, respectively. Our results are a promising starting point for future integration of single photon sources into photonic quantum networks and applications in quantum information science.

Liebermeister, Lars, E-mail: lars.liebermeister@physik.uni-muenchen.de; Petersen, Fabian; Mnchow, Asmus v.; Burchardt, Daniel; Hermelbracht, Juliane; Tashima, Toshiyuki [Fakultt fr Physik, Ludwig-Maximilians-Universitt Mnchen, 80799 Mnchen (Germany); Schell, Andreas W.; Benson, Oliver [Institut fr Physik, Humboldt-Universitt zu Berlin, 12489 Berlin (Germany); Meinhardt, Thomas; Krueger, Anke [Institut fr Organische Chemie, Universitt Wrzburg, 97074 Wrzburg (Germany); Wilhelm Conrad Roentgen Research Center for Complex Materials Systems, Universitt Wrzburg, 97074 Wrzburg (Germany); Stiebeiner, Ariane; Rauschenbeutel, Arno [Atominstitut, Technische Universitt Wien, 1020 Wien (Austria); Weinfurter, Harald; Weber, Markus, E-mail: markusweber@lmu.de [Fakultt fr Physik, Ludwig-Maximilians-Universitt Mnchen, 80799 Mnchen (Germany); Max-Planck-Institut fr Quantenoptik, 85748 Garching (Germany)

2014-01-20T23:59:59.000Z

322

Energy and System Size Dependence of Photon Production at Forward Rapidities at RHIC  

E-Print Network (OSTI)

The energy and system size dependence of pseudorapidity ($\\eta$) and multiplicity distributions of photons are measured in the region -2.3 $\\leq$ $\\eta$ $\\leq$ -3.7 for Cu + Cu collisions at $\\sqrt{s_{NN}}$ = 200 and 62.4 GeV. Photon multiplicity measurements at forward rapidity have been carried out using a Photon Multiplicity Detector (PMD) in the STAR experiment. Photons are found to follow longitudinal scaling for Cu + Cu collisions for 0-10% centrality. A Comparison of pseudorapidity distributions with HIIJING model is also presented.

Monika Sharma; Sunil Dogra; Neeraj Gupta

2007-04-24T23:59:59.000Z

323

Photonics poster small  

NLE Websites -- All DOE Office Websites (Extended Search)

Capabilities Capabilities in Solid State Lighting Research and Development of Light-Emitting Diodes (LEDs) and Organic Light-Emitting Diodes (OLEDs) Research & Development Applications Optical Measurements National Center for Electron Microscopy (NCEM) Advanced Light Source (ALS) Research in LEDs Spin casting of OLED Growing Low Defect GaN Crystals to reduce the density of structural defects Minigoniometer viewing LED Optical design of device and packaging Local Lattice Constants and Electric Fields LEDs Research & Development of OLEDs Measurement of spectral power distribution and efficacy of OLED Design and fabrication of luminaires: LED porchlight Electric fields and lattice parameters are simultaneously recorded by the side band and autocorrelation of an electron

324

Quantum phase gate for optical qubits with cavity quantum optomechanics  

E-Print Network (OSTI)

We show that a cavity optomechanical system formed by a mechanical resonator simultaneously coupled to two modes of an optical cavity can be used for the implementation of quantum phase gate between optical qubits associated with the two intracavity modes. The scheme is realizable for sufficiently strong single-photon optomechanical coupling in the resolved sideband regime, and is robust against cavity losses.

Muhammad Asjad; Paolo Tombesi; David Vitali

2015-01-16T23:59:59.000Z

325

Nonimaging Optics  

Science Journals Connector (OSTI)

The nonimaging optical system, by definition, does not produce an image of the light source. Instead, it is designed to concentrate radiation at a density as high as theoretically possible. Nonimaging optics h...

Dr. Ralf Leutz; Dr. Akio Suzuki

2001-01-01T23:59:59.000Z

326

Optical Switch  

NLE Websites -- All DOE Office Websites (Extended Search)

seven wonders Optical Switch A key component in the laser chain, an optical switch called a plasma electrode Pockels cell (PEPC), was invented and developed at LLNL. A Pockels cell...

327

Lamb-Dicke spectroscopy of atoms in a hollow-core photonic crystal fibre  

E-Print Network (OSTI)

Unlike photons, which are conveniently handled by mirrors and optical fibres without loss of coherence, atoms lose their coherence via atom-atom and atom-wall interactions. This decoherence of atoms deteriorates the performance of atomic clocks and magnetometers, and also hinders their miniaturisation. Here we report a novel platform for precision spectroscopy. Ultracold strontium atoms inside a kKagome-lattice hollow-core photonic crystal fibre (HC-PCF) are transversely confined by an optical lattice to prevent atoms from interacting with the fibre wall. By confining at most one atom in each lattice site, to avoid atom-atom interactions and Doppler effect, a 7.8-kHz-wide spectrum is observed for the $^1 S_0-{}^3P_1$ (m=0) transition. Atoms singly trapped in a magic lattice in hollow-core photonic crystal fibresHC-PCFs improve the optical depth while preserving atomic coherence time.

Okaba, Shoichi; Benabid, Fetah; Bradley, Tom; Vincetti, Luca; Maizelis, Zakhar; Yampol'skii, Valery; Nori, Franco; Katori, Hidetoshi

2014-01-01T23:59:59.000Z

328

Thermal photons as a quark-gluon plasma thermometer revisited  

E-Print Network (OSTI)

Photons are a penetrating probe of the hot medium formed in heavy-ion collisions, but they are emitted from all collision stages. At photon energies below 2-3 GeV, the measured photon spectra are approximately exponential and can be characterized by their inverse logarithmic slope, often called "effective temperature" T_eff. Modeling the evolution of the radiating medium hydrodynamically, we analyze the factors controlling the value of T_eff and how it is related to the evolving true temperature T of the fireball. We find that at RHIC and LHC energies most photons are emitted from fireball regions with T ~ T_c near the quark-hadron phase transition, but that their effective temperature is significantly enhanced by strong radial flow. Although a very hot, high pressure early collision stage is required for generating this radial flow, we demonstrate that the experimentally measured large effective photon temperatures T_eff > T_c do not prove that any electromagnetic radiation was actually emitted from regions ...

Shen, Chun; Paquet, Jean-Francois; Gale, Charles

2013-01-01T23:59:59.000Z

329

Entangling two atoms in spatially separated cavities through both photon emission and absorption processes  

E-Print Network (OSTI)

We consider a system consisting of a $\\Lambda$-type atom and a V-type atom, which are individually trapped in two spatially separated cavities that are connected by an optical fibre. We show that an extremely entangled state of the two atoms can be deterministically generated through both photon emission of the $\\Lambda$-type atom and photon absorption of the V-type atom in an ideal situation. The influence of various decoherence processes such as spontaneous emission and photon loss on the fidelity of the entangled state is also investigated. We find that the effect of photon leakage out of the fibre on the fidelity can be greatly diminished in some special cases. As regards the effect of spontaneous emission and photon loss from the cavities, we find that the present scheme with a fidelity higher than 0.98 may be realized under current experiment conditions.

Peng Peng; Fu-li Li

2006-12-29T23:59:59.000Z

330

Photons that travel in free space slower than the speed of light  

E-Print Network (OSTI)

That the speed of light in free space is constant is a cornerstone of modern physics. However, light beams have finite transverse size, which leads to a modification of their wavevectors resulting in a change to their phase and group velocities. We study the group velocity of single photons by measuring a change in their arrival time that results from changing the beam's transverse spatial structure. Using time-correlated photon pairs we show a reduction of the group velocity of photons in both a Bessel beam and photons in a focused Gaussian beam. In both cases, the delay is several microns over a propagation distance of the order of 1 m. Our work highlights that, even in free space, the invariance of the speed of light only applies to plane waves. Introducing spatial structure to an optical beam, even for a single photon, reduces the group velocity of the light by a readily measurable amount.

Giovannini, Daniel; Potocek, Vaclav; Ferenczi, Gergely; Speirits, Fiona; Barnett, Stephen M; Faccio, Daniele; Padgett, Miles J

2014-01-01T23:59:59.000Z

331

Photons that travel in free space slower than the speed of light  

E-Print Network (OSTI)

That the speed of light in free space is constant is a cornerstone of modern physics. However, light beams have finite transverse size, which leads to a modification of their wavevectors resulting in a change to their phase and group velocities. We study the group velocity of single photons by measuring a change in their arrival time that results from changing the beam's transverse spatial structure. Using time-correlated photon pairs we show a reduction of the group velocity of photons in both a Bessel beam and photons in a focused Gaussian beam. In both cases, the delay is several microns over a propagation distance of the order of 1 m. Our work highlights that, even in free space, the invariance of the speed of light only applies to plane waves. Introducing spatial structure to an optical beam, even for a single photon, reduces the group velocity of the light by a readily measurable amount.

Daniel Giovannini; Jacquiline Romero; Vaclav Potocek; Gergely Ferenczi; Fiona Speirits; Stephen M. Barnett; Daniele Faccio; Miles J. Padgett

2014-11-14T23:59:59.000Z

332

A proposal for the implementation of quantum gates with photonic-crystal coupled cavity waveguides  

E-Print Network (OSTI)

Quantum computers require technologies that offer both sufficient control over coherent quantum phenomena and minimal spurious interactions with the environment. We show, that photons confined to photonic crystals, and in particular to highly efficient waveguides formed from linear chains of defects doped with atoms can generate strong non-linear interactions which allow to implement both single and two qubit quantum gates. The simplicity of the gate switching mechanism, the experimental feasibility of fabricating two dimensional photonic crystal structures and integrability of this device with optoelectronics offers new interesting possibilities for optical quantum information processing networks.

Dimitris G. Angelakis; Marcelo Franca Santos; Vassilis Yannopapas; Artur Ekert

2007-04-12T23:59:59.000Z

333

Collimator-free photon tomography  

DOE Patents (OSTI)

A method of uncollimated single photon emission computed tomography includes administering a radioisotope to a patient for producing gamma ray photons from a source inside the patient. Emissivity of the photons is measured externally of the patient with an uncollimated gamma camera at a plurality of measurement positions surrounding the patient for obtaining corresponding energy spectrums thereat. Photon emissivity at the plurality of measurement positions is predicted using an initial prediction of an image of the source. The predicted and measured photon emissivities are compared to obtain differences therebetween. Prediction and comparison is iterated by updating the image prediction until the differences are below a threshold for obtaining a final prediction of the source image. 6 figs.

Dilmanian, F.A.; Barbour, R.L.

1998-10-06T23:59:59.000Z

334

Collimator-free photon tomography  

DOE Patents (OSTI)

A method of uncollimated single photon emission computed tomography includes administering a radioisotope to a patient for producing gamma ray photons from a source inside the patient. Emissivity of the photons is measured externally of the patient with an uncollimated gamma camera at a plurality of measurement positions surrounding the patient for obtaining corresponding energy spectrums thereat. Photon emissivity at the plurality of measurement positions is predicted using an initial prediction of an image of the source. The predicted and measured photon emissivities are compared to obtain differences therebetween. Prediction and comparison is iterated by updating the image prediction until the differences are below a threshold for obtaining a final prediction of the source image.

Dilmanian, F. Avraham (Yaphank, NY); Barbour, Randall L. (Westbury, NY)

1998-10-06T23:59:59.000Z

335

New directions in photonics simulation: Lanczos recursion and finite-difference time-domain  

SciTech Connect

Computational Integrated Photonics (CIP) is the area of computational physics that treats the propagation of light in optical fibers and in integrated optical circuits. The purpose of integrated photonics simulation is to develop the computational tools that will support the design of photonic and optoelectronic integrated devices. CIP has, in general, two thrusts: (1) predictive models of photonic device behavior that can be used reliably to enhance significantly the speed with which designs axe optimized for development applications, and (2) to further our ability to describe the linear and nonlinear processes that occur - and can be exploited - in real photonic devices. Experimental integrated optics has been around for over a decade with much of the work during this period. centered on proof-of-principle devices that could be described using simple analytic and numerical models. Recent advances in material growths, photolithography, and device complexity have conspired to reduce significantly the number of devices that can be designed with simple models and to increase dramatically the interest in CIP. In the area of device design, CIP is viewed as critical to understanding device behavior and to optimization. In the area of propagation physics, CIP is an important tool in the study of nonlinear processes in integrated optical devices and fibers. In this talk I will discuss two of the new directions we have been investigating in CIP: Lanczos recursion and finite-difference time-domain.

Hawkins, R.J.; McLeod, R.R.; Kallman, J.S.; Ratowsky, R.P.; Feit, M.D.; Fleck, J.A. Jr.

1992-06-01T23:59:59.000Z

336

Advanced Photon Source  

NLE Websites -- All DOE Office Websites (Extended Search)

Home Home Group Members Accelerator Magnets Insertion Devices Facilities Presentations & Publications Internal Magnetic Devices Group The primary mission of the Magnetic Devices (MD) Group is to design, build, and maintain Insertion Devices (IDs) that are reliable and transparent to the electron beam at the Advanced Photon Source (APS). The majority of IDs at the APS are conventional planar hybrid undulators, but an essential part of the mission is to develop novel IDs, such as short-period superconducting undulators and long-period electromagnetic undulators. The capabilities of APS IDs are matched to users' experimental needs. The mission also includes magnetic tuning of the IDs to ensure their near-ideal performance as x-ray sources and calculations to predict the radiation

337

Photon enhanced thermionic emission  

DOE Patents (OSTI)

Photon Enhanced Thermionic Emission (PETE) is exploited to provide improved efficiency for radiant energy conversion. A hot (greater than 200.degree. C.) semiconductor cathode is illuminated such that it emits electrons. Because the cathode is hot, significantly more electrons are emitted than would be emitted from a room temperature (or colder) cathode under the same illumination conditions. As a result of this increased electron emission, the energy conversion efficiency can be significantly increased relative to a conventional photovoltaic device. In PETE, the cathode electrons can be (and typically are) thermalized with respect to the cathode. As a result, PETE does not rely on emission of non-thermalized electrons, and is significantly easier to implement than hot-carrier emission approaches.

Schwede, Jared; Melosh, Nicholas; Shen, Zhixun

2014-10-07T23:59:59.000Z

338

OPTICAL CONSTANTS OF THIN FILMS FROM THE CHARACTERISTIC ELECTRON ENERGY LOSSES  

E-Print Network (OSTI)

114. OPTICAL CONSTANTS OF THIN FILMS FROM THE CHARACTERISTIC ELECTRON ENERGY LOSSES By R. E in the photon energy range from 5 to 30 eV. The optical constants of aluminum from 2 500 A to 6 500 A have been à une étude de l'oscillateur optique. Abstract. 2014 A method for obtaining the optical constants

Paris-Sud XI, Université de

339

Experimental characterisation of nonlocal photon fluids  

E-Print Network (OSTI)

Quantum gases of atoms and exciton-polaritons are nowadays a well established theoretical and experimental tool for fundamental studies of quantum many-body physics and suggest promising applications to quantum computing. Given their technological complexity, it is of paramount interest to devise other systems where such quantum many-body physics can be investigated at a lesser technological expense. Here we examine a relatively well-known system of laser light propagating through thermo-optical defocusing media: based on a hydrodynamical description of light as a quantum fluid of interacting photons, we propose such systems as a valid, room temperature alternative to atomic or exciton-polariton condensates for studies of many-body physics. First, we show that by using a technique traditionally used in oceanography, it is possible to perform a direct measurement of the single-particle part of the dispersion relation of the elementary excitations on top of the photon fluid and to detect its global flow. Then, ...

Vocke, David; Marino, Francesco; Wright, Ewan M; Carusotto, Iacopo; Faccio, Daniele

2015-01-01T23:59:59.000Z

340

Lattice Boltzmann model for photonic band gap materials  

Science Journals Connector (OSTI)

An efficient technique for computing photonic band structure and defect modes is proposed based on the lattice Boltzmann model. Physically, it is a scheme based on the kinetics of the virtual microscopic process, rather than a solution of the macroscopic Maxwell equations. The method has significant advantages of being naturally suited for massively parallel machine, as well as speed and convenience, providing another methodology for photonic band gap materials and, also, for general electromagnetic scattering problems in open region when incorporated with the perfectly matched layer technique.

Zhifang Lin; Haiping Fang; Jianjun Xu; Jian Zi; Xiangdong Zhang

2003-02-07T23:59:59.000Z

Note: This page contains sample records for the topic "regional optics photonics" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


341

Role of surface states and defects in the ultrafast nonlinear optical properties of CuS quantum dots  

SciTech Connect

We report facile preparation of water dispersible CuS quantum dots (24 nm) and nanoparticles (511 nm) through a nontoxic, green, one-pot synthesis method. Optical and microstructural studies indicate the presence of surface states and defects (dislocations, stacking faults, and twins) in the quantum dots. The smaller crystallite size and quantum dot formation have significant effects on the high energy excitonic and low energy plasmonic absorption bands. Effective two-photon absorption coefficients measured using 100 fs laser pulses employing open-aperture Z-scan in the plasmonic region of 800 nm reveal that CuS quantum dots are better ultrafast optical limiters compared to CuS nanoparticles.

Mary, K. A. Ann; Unnikrishnan, N. V., E-mail: nvu100@yahoo.com [School of Pure and Applied Physics, Mahatma Gandhi University, Kottayam 686560 (India); Philip, Reji [Light and Matter Physics Group, Raman Research Institute, C.V. Raman Avenue, Sadashivanagar, Bangalore 560080 (India)

2014-07-01T23:59:59.000Z

342

Hybrid Photonic Hyper-Controlled-Not Gate with the Dipole Induced Transparency in Weak-Coupling Regime  

E-Print Network (OSTI)

We present a hybrid hyper-controlled-not (hyper-CNOT) gate for hyperparallel photonic quantum computing based on both the polarization and spatial-mode degrees of freedom (DOFs) of a two-photon system, which is identical to two CNOT gates operating at the same time on four photons in one DOF. This proposal is implemented with the optical reflection-transmission property of a diamond nitrogen-vacancy center embedded in a photonic crystal cavity coupled to two waveguides, which is suitable for the robust and flexible quantum information processing based on both the spatial-mode and polarization DOFs of photon systems in Purcell regime. With the hybrid hyper-CNOT gate, more quantum logic gate operations can be accomplished with less resources in a definite period of time, and the influence from photonic dissipation and environment noise can be suppressed.

Bao-Cang Ren; Fu-Guo Deng

2014-11-02T23:59:59.000Z

343

Stimulated emission of two photons in parametric amplification and its interpretation as multi-photon interference  

E-Print Network (OSTI)

Stimulated emission of two photons is observed experimentally in the parametric amplification process and is compared to a three-photon interference scheme. We find that the underlying physics of stimulated emission is simply the constructive interference due to photon indistinguishability. So the observed signal enhancement upon the input of photons is a result of multi-photon interference of the input photons and the otherwise spontaneously emitted photon from the amplifier.

F. W. Sun; B. H. Liu; Y. X. Gong; Y. F. Huang; Z. Y. Ou; G. C. Guo

2007-02-06T23:59:59.000Z

344

Advanced Photon Source Industrial Liaison Office | Advanced Photon Source  

NLE Websites -- All DOE Office Websites (Extended Search)

Industrial Liaison Office Industrial Liaison Office registration page New to Synchrotron Radiation New to the APS Already a User Advanced Photon Source Industrial Liaison Office APS Welcome to the Advanced Photon Source Welcome to the Advanced Photon Source (APS) at Argonne National Laboratory. We are one of five synchrotron radiation light sources operated as national user facilities by the U.S. Department of Energy's Office of Science. The APS is open to everyone who can utilize extremely bright x-ray photon beams for high-value research. This premier national research facility provides these x-ray beams to more than 5,000 scientists from all 50 United States, the District of Columbia, Puerto Rico, and several foreign countries. These scientists come to the APS from industry, universities,

345

Development of a realistic photonic modeling for the evaluation of infrared reflections in the metallic environment of ITER  

SciTech Connect

In nuclear fusion experiments, the plasma facing components are exposed to high heat fluxes and infrared (IR) imaging diagnostics are routinely used for surveying their surface temperature for preventing damages. However the future use of metallic components in the ITER tokamak adds complications in temperature estimation. Indeed, low and variable emissivity of the observed surface and the multiple reflections of the light coming from hot regions will have to be understood and then taken into account. In this paper, a realistic photonic modeling based on Monte Carlo ray-tracing codes is used to predict the global response of the complete IR survey system. This also includes the complex vessel geometry and the thermal and optical surface properties using the bidirectional reflectivity distribution function that models the photon-material interactions. The first results of this simulation applied to a reference torus are presented and are used as a benchmark to investigate the validity of the global model. Finally the most critical key model parameters in the reflected signals are identified and their contribution is discussed.

Aumeunier, M.-H.; Travere, J.-M. [CEA, IRFM, Saint-Paul-Les-Durance F-13108 (France)

2010-10-15T23:59:59.000Z

346

OPTICS 5  

NLE Websites -- All DOE Office Websites (Extended Search)

OPTICS (Version 5.1.02) OPTICS (Version 5.1.02) Release notes NOTE: See the Optics Knowledge Base for how to run this version of Optics on the Microsoft Vista and Microsoft Windows 7 operating systems March 5, 2003: Release Maintenance Pack 2 New ! January 7, 2003: Release Maintenance Pack 1 October 23, 2002: Release Optics 5.1.01 September 27, 2002: Release Optics 5.1.00 (only released on CDs at NFRC Annual Fall Meeting) Release notes Maintenance Pack 2 Bug fixes: New features: bullet Applied films that were created could not be saved or exported. This has been fixed. bullet Exporting glazing systems generated a message that the operation failed because the glazing system type is unknown. Glazing systems can now be exported to file (e.g. to view the spectral data), but the structure information will be lost.

347

Compton scattering of 20- to 40-keV photons  

Science Journals Connector (OSTI)

The scattered-energy spectra of monochronized synchrotron-radiation photons toward 90 by C, Al, Fe, Cu, Au, and Pb samples were measured using high-purity Ge detectors to obtain incoherent scattering function (S) in the 1.14region. The multiple-scattering intensity was evaluated by a Monte Carlo calculation while considering the Doppler broadening of the Compton-scattered photons and the photon linear polarization. The measured S of C, Al, Fe, and Cu agreed with that based on the Waller-Hartree theory (SWH), as well as that based on a relativistic impulse approximation (SIA) within the experiment error (2.5%). The measured S of high-Z atoms (Au and Pb) agrees with SIA and is smaller than SWH by 36 %.

Y. Namito; S. Ban; H. Hirayama; N. Nariyama; H. Nakashima; Y. Nakane; Y. Sakamoto; N. Sasamoto; Y. Asano; S. Tanaka

1995-04-01T23:59:59.000Z

348

Optical constants of magnetron sputtered boron carbide thin films from photoabsorption data in the range 30 to 770 eV  

SciTech Connect

This work discusses the experimental determination of the optical constants (refractive index) of DC-magnetron-sputtered boron carbide films in the 30-770 eV photon energy range. Transmittance measurements of three boron carbide films with thicknesses of 54.2, 79.0 and 112.5 nm were performed for this purpose. These are the first published experimental data for the refractive index of boron carbide films in the photon energy range above 160 eV, and for the near-edge x-ray absorption fine structure (NEXAFS) regions around the boron K (188 eV), carbon K (284.2 eV) and oxygen K (543.1 eV) absorption edges. The density, composition, surface chemistry and morphology of the films in this manuscript were also investigated using Rutherford Backscattering (RBS), X-ray Photoelectron Spectroscopy (XPS), Atomic Force Microscopy (AFM), Scanning Electron Microscopy (SEM), and extreme ultraviolet (EUV) reflectance measurements.

Soufli, R; Aquila, A L; Salmassi, F; Fernandez-Perea, M; Gullikson, E M

2008-05-21T23:59:59.000Z

349

Optical Magnetism  

Science Journals Connector (OSTI)

Magnetic dipole radiation one fourth as intense as electric dipole radiation, as well as a novel nonlinear magneto-optical effect are reported in dielectric media.

Oliveira, Samuel L; Rand, Stephen C

350

Regional Purchasing  

NLE Websites -- All DOE Office Websites (Extended Search)

Regional Purchasing Regional Purchasing Regional Purchasing Pursuant to Appendix M of Prime Contract No. DE-AC52-06NA25396 between DOE/NNSA and Los Alamos National Security, LLC (LANS), LANS is committed to building a strong supplier base with Northern New Mexico businesses and the local Native American pueblos in the purchases of goods and services. Contact Small Business Office (505) 667-4419 Email We seek out and utilize known Northern New Mexico business as suppliers The Northern New Mexico counties included are Los Alamos Santa Fe Rio Arriba Taos Mora San Miguel Sandoval The eight regional pueblos included are Nambe Ohkay Owingeh (formerly known as San Juan) Picuris Pojoaque San Ildefonso Santa Clara Taos Tesuque When the Laboratory cannot identify regional firms, it will expand its

351

National Ignition Facility & Photon Science  

NLE Websites -- All DOE Office Websites (Extended Search)

5 National Ignition Facility & Photon Science how do Lasers work? how Do Lasers work? A laser can be as small as a microscopic computer chip or as immense as the National Ignition...

352

Photons and Dileptons at LHC  

E-Print Network (OSTI)

We discuss real and virtual photon sources in heavy ion collisions and present results for dilepton yields in Pb+Pb collisions at the LHC at intermediate and large transverse momentum p_T.

Rainer J. Fries; S. Turbide; C. Gale; D. K. Srivastava

2007-07-02T23:59:59.000Z

353

Atom Nano-Optics  

Science Journals Connector (OSTI)

Nanolocalized light fields composed of photon dots and photon holes are being used to control the motion of atoms on a nanometer spatial scale.

Balykin, Victor; Klimov, Vasilii; Letokhov, Vladilen

2005-01-01T23:59:59.000Z

354

People | Advanced Photon Source  

NLE Websites -- All DOE Office Websites (Extended Search)

About the APS: About the APS: Welcome Overview Visitor Information Mission & Goals Find People Organization Charts Committees Job Openings Find People Fields marked * are required. Search: search By last name: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z By division: Select a division Accelerator Systems Division (ASD) APS Engineering Support (AES) Xray Science Division (XSD) Photon Sciences (PSC) By group: Select a group AES-ADM AES-BC AES-CS AES-CTL AES-DD AES-IAG AES-IS AES-IT AES-MED AES-MIS AES-MOM AES-PRO AES-QA AES-SA AES-SI AES-SO AES-SSG AES-UES ASD-ADM ASD-AOP ASD-APH ASD-DIA ASD-MD ASD-OPT ASD-PS ASD-QA ASD-RF XSD-ADM XSD-AMO XSD-CJJ XSD-CMS XSD-DET XSD-GS XSD-IMG XSD-IXN XSD-MIC XSD-MM XSD-MPE XSD-OPT XSD-QA XSD-SPC XSD-SRS XSD-SSM XSD-TAS XSD-TRR XSD-UAS XSD-XMI PSC-PA General Inquiries

355

Integration of highly probabilistic sources into optical quantum architectures: perpetual quantum computation  

E-Print Network (OSTI)

In this paper we introduce a design for an optical topological cluster state computer constructed exclusively from a single quantum component. Unlike previous efforts we eliminate the need for on demand, high fidelity photon sources and detectors and replace them with the same device utilised to create photon/photon entanglement. This introduces highly probabilistic elements into the optical architecture while maintaining complete specificity of the structure and operation for a large scale computer. Photons in this system are continually recycled back into the preparation network, allowing for a arbitrarily deep 3D cluster to be prepared using a comparatively small number of photonic qubits and consequently the elimination of high frequency, deterministic photon sources.

Simon J. Devitt; Ashley M. Stephens; William J. Munro; Kae Nemoto

2011-02-02T23:59:59.000Z

356

Optical Expanders with Applications in Optical Computing  

E-Print Network (OSTI)

Optical Expanders with Applications in Optical Computing John H. Reif Akitoshi Yoshida July 20, 1999 Abstract We describe and investigate an optical system which we call an optical expander. An optical expander elec- trooptically expands an optical boolean pattern encoded in d bits into an optical

Reif, John H.

357

Photonic Crystal Cavities in Cubic (3C) Polytype Silicon Carbide Films  

E-Print Network (OSTI)

We present the design, fabrication, and characterization of high quality factor and small mode volume planar photonic crystal cavities from cubic (3C) thin films (thickness ~ 200 nm) of silicon carbide (SiC) grown epitaxially on a silicon substrate. We demonstrate cavity resonances across the telecommunications band, with wavelengths from 1,250 - 1,600 nm. Finally, we discuss possible applications in nonlinear optics, optical interconnects, and quantum information science.

Marina Radulaski; Thomas M. Babinec; Sonia Buckley; Armand Rundquist; J Provine; Kassem Alassaad; Gabriel Ferro; Jelena Vu?kovi?

2013-11-30T23:59:59.000Z

358

Sommersemester 2014 Master Photonics 2. Term Limpert/Nolte nn nn Gross Limpert/Nolte  

E-Print Network (OSTI)

Photonics electr. th. & applic. w. Zemax electro- simul.w. X-ray optics Imaging II course Laser 11.00 - 12 Laser E Laser L Design & L Laser Physics Physics Physics correct. of L Laser Physics - 2 - - 3 - optic.00 - 11.00 E ev. 2 w.i.t. ev. 2 w. ev. 2 w.i.t. L Physical ev. 2 weeks Förster German every 2 w. Laser E

Knüpfer, Christian

359

BazookaSPECT: A Low-Cost Approach to High-Resolution, Single-Photon Imaging Using Columnar Scintillators and Image Intensifiers  

E-Print Network (OSTI)

-photon counting gamma-ray detector based on an image intensifier optically coupled to a low-cost CCD. Typically and allowing for a customizable imaging system. Operating in photon-counting mode, individual gamma-ray functioning as a gamma-ray microscope, (b) white-light microscope image of four 111 In oxine source beads, (c

Arizona, University of

360

An optical data receiver for integrated photonic interconnects  

E-Print Network (OSTI)

The throughput bounds of traditional interconnect networks in microprocessors are being pushed to their limits. In past single-core processors, the number of long global wires constituted only a small fraction of the total. ...

Georgas, Michael S. (Michael Stephen)

2009-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "regional optics photonics" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


361

Integrated optical source of polarization entangled photons at 1310 nm  

E-Print Network (OSTI)

waveguide," Opt. Express 15, 12769­12776 (2007), http://www.opticsexpress.org/abstract.cfm?URI=OPEX-15

Paris-Sud XI, Université de

362

CREOLThe College of Optics & Photonics Industrial Affiliates Day  

E-Print Network (OSTI)

................................................................................. 4 · The Art of Innovation: Laser Technology for New Markets · HEL Joint Technology Office (JTO 9:20 The Art of Innovation ­ Laser Technology for new Markets Prof. Dr. Reinhart Poprawe, M.A. Fraunhofer-Institute for Laser Technology and Chair for Laser Technology RWTH-Aachen University 10:00 HEL

Van Stryland, Eric

363

Mesoporous silicon photonic crystal microparticles: towards single-cell optical  

E-Print Network (OSTI)

in theranostics. Mesoporous silicon, where pores are in the size range of 2�50 nm, is the most relevant material

Kilian, Kristopher A.

364

Photon rockets and gravitational radiation  

E-Print Network (OSTI)

The absence of gravitational radiation in Kinnersley's ``photon rocket'' solution of Einstein's equations is clarified by studying the mathematically well-defined problem of point-like photon rockets in Minkowski space (i.e. massive particles emitting null fluid anisotro\\-pically and accelerating because of the recoil). We explicitly compute the (uniquely defined) {\\it linearized} retarded gravitational waves emitted by such objects, which are the coherent superposition of the gravitational waves generated by the motion of the massive point-like rocket and of those generated by the energy-momentum distribution of the photon fluid. In the special case (corresponding to Kinnersley's solution) where the anisotropy of the photon emission is purely dipolar we find that the gravitational wave amplitude generated by the energy-momentum of the photons exactly cancels the usual $1/r$ gravitational wave amplitude generated by the accelerated motion of the rocket. More general photon anisotropies would, however, generate genuine gravitational radiation at infinity. Our explicit calculations show the compatibility between the non-radiative character of Kinnersley's solution and the currently used gravitational wave generation formalisms based on post-Minkowskian perturbation theory.

T. Damour

1994-12-21T23:59:59.000Z

365

Universal squash model for optical communications using linear optics and threshold detectors  

SciTech Connect

Transmission of photons through open-air or optical fibers is an important primitive in quantum-information processing. Theoretical descriptions of this process often consider single photons as information carriers and thus fail to accurately describe experimental implementations where any number of photons may enter a detector. It has been a great challenge to bridge this big gap between theory and experiments. One powerful method for achieving this goal is by conceptually squashing the received multiphoton states to single-photon states. However, until now, only a few protocols admit a squash model; furthermore, a recently proven no-go theorem appears to rule out the existence of a universal squash model. Here we show that a necessary condition presumed by all existing squash models is in fact too stringent. By relaxing this condition, we find that, rather surprisingly, a universal squash model actually exists for many protocols, including quantum key distribution, quantum state tomography, Bell's inequality testing, and entanglement verification.

Fung, Chi-Hang Fred; Chau, H. F. [Department of Physics and Center of Computational and Theoretical Physics, University of Hong Kong, Pokfulam Road (Hong Kong); Lo, Hoi-Kwong [Center for Quantum Information and Quantum Control, Department of Physics and Department of Electrical and Computer Engineering, University of Toronto, Toronto, Ontario, M5S 3G4 (Canada)

2011-08-15T23:59:59.000Z

366

Optical Glass  

Science Journals Connector (OSTI)

... space of time. In the forefront of such vital industries is the manufacture of optical glass. However great the other resources in men and material may be, it would be ... be, it would be quite impossible to wage successful warfare without adequate supplies of optical glass ior binocular field- ...

1919-03-27T23:59:59.000Z

367

Energy-time entanglement generation in optical fibers under CW pumping  

Science Journals Connector (OSTI)

In this paper, the energy-time entangled photon-pairs at 1.5 ?m are generated by the spontaneous four wave mixing (SFWM) in optical fibers under continuous wave (CW) pumping. The...

Dong, Shuai; Zhou, Qiang; Zhang, Wei; He, Yuhao; Zhang, Weijun; You, Lixing; Huang, Yidong; Peng, Jiangde

2014-01-01T23:59:59.000Z

368

Optical A/D using Oversampling by Second-Order DSM  

Science Journals Connector (OSTI)

A novel photonic analog-to-digital convertor (A/D) based on delta-sigma modulation technique has been investigated and a prototype fiber-optic A/D that operates at 30 MS/s and a binary...

Reeves, Erin; Costanzo, Pablo; Granieri, Sergio; Siahmakoun, Azad

369

Design and fabrication of micro- and nano- dielectric structures for imaging and focusing at optical frequencies  

E-Print Network (OSTI)

In this thesis work, design and fabrication of micro- and nano-photonic structures both in the diffraction regime and sub-wavelength regime have been investigated. In the diffraction regime, two types of optical systems ...

Takahashi, Satoshi, Ph. D. Massachusetts Institute of Technology

2011-01-01T23:59:59.000Z

370

One and two photon optogalvanic spectroscopy of argon and neon for the wavelength calibration in the near infrared  

E-Print Network (OSTI)

in the near infrared Zhen Tang *, Richard B. Miles Department of Mechanical and Aerospace Engineering The one photon and two photon optogalvanic spectra of argon and neon have been investigated in the near infrared region between 735 and 781 nm. About 35 transitions have been recorded by illuminating a hollow

Miles, Richard

371

New Optical Sensor Suite for Ultrahigh Temperature Fossil Fuel Application  

SciTech Connect

Accomplishments of a program to develop and demonstrate photonic sensor technology for the instrumentation of advanced powerplants and solid oxide fuel cells are described. The goal of this project is the research and development of advanced, robust photonic sensors based on improved sapphire optical waveguides, and the identification and demonstration of applications of the new sensors in advanced fossil fuel power plants, where the new technology will contribute to improvements in process control and monitoring.

John Coggin; Tom Flynn; Jonas Ivasauskas; Daniel Kominsky; Carrie Kozikowski; Russell May; Michael Miller; Tony Peng; Gary Pickrell; Raymond Rumpf; Kelly Stinson-Bagby; Dan Thorsen; Rena Wilson

2007-12-31T23:59:59.000Z

372

Optical ionization detector  

DOE Patents (OSTI)

An optical ionization detector wherein a beam of light is split so that one arm passes through a fiber optics and the other arm passes through a gas-filled region, and uses interferometry to detect density changes in a gas when charged particles pass through it. The gas-filled region of the detector is subjected to a high electric field and as a charged particle traverses this gas region electrons are freed from the cathode and accelerated so as to generate an electron avalanche which is collected on the anode. The gas density is effected by the electron avalanche formation and if the index or refraction is proportional to the gas density the index will change accordingly. The detector uses this index change by modulating the one arm of the split light beam passing through the gas, with respect to the other arm that is passed through the fiber optic. Upon recombining of the beams, interference fringe changes as a function of the index change indicates the passage of charged particles through the gaseous medium. 3 figures.

Wuest, C.R.; Lowry, M.E.

1994-03-29T23:59:59.000Z

373

Optical ionization detector  

DOE Patents (OSTI)

An optical ionization detector wherein a beam of light is split so that one arm passes through a fiber optics and the other arm passes through a gas-filled region, and uses interferometry to detect density changes in a gas when charged particles pass through it. The gas-filled region of the detector is subjected to a high electric field and as a charged particle traverses this gas region electrons are freed from the cathode and accelerated so as to generate an electron avalanche which is collected on the anode. The gas density is effected by the electron avalanche formation and if the index or refraction is proportional to the gas density the index will change accordingly. The detector uses this index change by modulating the one arm of the split light beam passing through the gas, with respect to the other arm that is passed through the fiber optic. Upon recombining of the beams, interference fringe changes as a function of the index change indicates the passage of charged particles through the gaseous medium.

Wuest, Craig R. (Danville, CA); Lowry, Mark E. (Castro Valley, CA)

1994-01-01T23:59:59.000Z

374

Regional Inventories  

Gasoline and Diesel Fuel Update (EIA)

5 5 Notes: This year has not started well for gasoline inventories, with inventories being low across regions of the country. The Midwest region (PADD II) had been running lower than most regions, but began to catch up during the last week in April. Gasoline inventories ran about 9% below their 5-year average for this time of year and about 4% below where they were last year. The recent refinery problems in the Midwest, though, could erase some of that recovery. The impacts of Tosco's Wood River refinery and Marathon's St Paul refinery are not fully realized. But inventories were also precariously low along the East Coast (PADD I) and are extremely low in the Rocky Mountain region (PADD IV), although the size of this market mitigates any national impact. While the

375

Conditional generation of arbitrary multimode entangled states of light with linear optics  

E-Print Network (OSTI)

We propose a universal scheme for the probabilistic generation of an arbitrary multimode entangled state of light with finite expansion in Fock basis. The suggested setup involves passive linear optics, single photon sources, strong coherent laser beams, and photodetectors with single-photon resolution. The efficiency of this setup may be greatly enhanced if, in addition, a quantum memory is available.

J. Fiurasek; S. Massar; N. J. Cerf

2003-04-01T23:59:59.000Z

376

Optical Burst Equalisation in Next Generation Access Networks B Cao and J E Mitchell  

E-Print Network (OSTI)

allowing standard receivers to be used, the detection system is simplified and the cost of the optical on the stimulated emission process. The photons of the incoming signal will interact with the carriers the photons in the incoming signal cause the stimulated emission, then the total gain of the with a large

Haddadi, Hamed

377

Toward photonic-crystal metamaterials: Creating magnetic emitters in photonic crystals  

E-Print Network (OSTI)

Toward photonic-crystal metamaterials: Creating magnetic emitters in photonic crystals M. L Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge explore the possibility of designing photonic crystals to act as magnetic metamaterials: structures

378

Towards High-Fidelity Quantum Computation and Simulation on a Programmable Photonic Integrated Circuit  

E-Print Network (OSTI)

We propose and analyze the design of a programmable photonic integrated circuit for high-fidelity quantum computation and simulation. We demonstrate that the reconfigurability of our design allows us to overcome two major impediments to quantum optics on a chip: it removes the need for a full fabrication cycle for each experiment and allows for compensation of fabrication errors using numerical optimization techniques. Under a pessimistic fabrication model for the silicon-on-insulator process, we demonstrate a dramatic fidelity improvement for the linear optics CNOT and CPHASE gates and, showing the scalability of this approach, the iterative phase estimation algorithm built from individually optimized gates. We also propose and simulate a novel experiment that the programmability of our system would enable: a statistically robust study of the evolution of entangled photons in disordered quantum walks. Overall, our results suggest that existing fabrication processes are sufficient to build a quantum photonic processor capable of high fidelity operation.

Jacob Mower; Nicholas C. Harris; Gregory R. Steinbrecher; Yoav Lahini; Dirk Englund

2014-12-16T23:59:59.000Z

379

Atlas of solar hidden photon emission  

E-Print Network (OSTI)

Hidden photons, gauge bosons of a U(1) symmetry of a hidden sector, can constitute the dark matter of the universe and a smoking gun for large volume compactifications of string theory. In the sub-eV mass range, a possible discovery experiment consists on searching the copious flux of these particles emitted from the Sun in a helioscope setup \\`a la Sikivie. In this paper, we compute the flux of transversely polarised HPs from the Sun, a necessary ingredient for interpreting such experiments. We provide a detailed exposition of photon-HP oscillations in inhomogenous media, with special focus on resonance oscillations, which play a leading role in many cases. The region of the Sun emitting HPs resonantly is a thin spherical shell for which we justify an averaged-emission formula and which implies a distinctive morphology of the angular distribution of HPs on Earth in many cases. Low mass HPs with energies in the visible and IR have resonances very close to the photosphere where the solar plasma is not fully io...

Redondo, Javier

2015-01-01T23:59:59.000Z

380

LASER & PHOTONICS www.lpr-journal.org Vol. 7 No. 5 September 2013  

E-Print Network (OSTI)

LASER & PHOTONICS REVIEWS www.lpr-journal.org Vol. 7 No. 5 September 2013 4H-SiC: a new nonlinear material for midinfrared lasers Nonlinear optical (NLO) frequency conversion is commonly used for generating midinfrared (MIR) lasers that offer light sources for a variety of applications. However, the low

Wang, Wei Hua

Note: This page contains sample records for the topic "regional optics photonics" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


381

Parallel FDTD Simulation of Photonic Crystals and Thin-Film Solar Cells  

Science Journals Connector (OSTI)

Finite difference time domain (FDTD) method is a robust and accurate algorithm which is widely used in computational electromagnetic field and the simulation of optical phenomenon. In this paper, parallel FDTD based on overlapped domain decomposition ... Keywords: finite difference time domain method, parallel, photonic crystal, thin-film solar cell, quantum efficiency

Wu Wang; Xuebin Chi; Yangde Feng; Yonghua Zhao

2012-12-01T23:59:59.000Z

382

A Specific Multi-channel Photon-Counting Unit for Air-Pollution Measurement  

E-Print Network (OSTI)

A Specific Multi-channel Photon-Counting Unit for Air-Pollution Measurement Papageorgas P.1.g. confocal microscopy), air pollution optical measurements, laser sounding of the atmosphere for the in situ quantitative monitoring of up to five air pollutants simultaneously and one calibration channel

Athens, University of

383

Modeling and Simulation Environment for Photonic Interconnection Networks in High Performance Computing  

E-Print Network (OSTI)

at the scale of high performance computer clusters and warehouse scale data centers, system level simulations and results for rack scale photonic interconnection networks for high performance computing. Keywords: optical to the newsworthy power consumption [3], latency [4] and bandwidth challenges [5] of high performance computing (HPC

Bergman, Keren

384

Fiber optic coupled optical sensor  

DOE Patents (OSTI)

A displacement sensor includes a first optical fiber for radiating light to a target, and a second optical fiber for receiving light from the target. The end of the first fiber is adjacent and not axially aligned with the second fiber end. A lens focuses light from the first fiber onto the target and light from the target onto the second fiber.

Fleming, Kevin J. (Albuquerque, NM)

2001-01-01T23:59:59.000Z

385

Advanced quantum cascade laser transmitter architectures and infrared photonics development  

SciTech Connect

Quantum cascade lasers (QCLs) provide a viable infrared laser source for a new class of laser transmitters capable of meeting the performance requirements for a variety of national security and civilian applications. The high output power, small size, and superb stability and modulation characteristics of QCLs make them amenable for integration as transmitters into ultra-sensitive, ultra-selective point sampling and remote short-range chemical sensors. This paper reports on the current development in infrared photonics that provides a pathway for QCL transmitter miniaturization. This research has produced infrared waveguide-based optical components in chalcogenide glass using both direct-laser writing and holographic exposure techniques. We discuss here the design and fabrication concepts and capabilities required to produce integrated waveguides, waveguide couplers, and other photonic devices.

Anheier, Norman C.; Allen, Paul J.; Myers, Tanya L.

2004-08-01T23:59:59.000Z

386

Quantum walks and quantum simulation of wavepacket dynamics with twisted photons  

E-Print Network (OSTI)

The "quantum walk" has emerged recently as a paradigmatic process for the dynamic simulation of complex quantum systems, entanglement production and quantum computation. Hitherto, photonic implementations of quantum walks have mainly been based on multi-path interferometric schemes in real space. Here, we report the experimental realization of a discrete quantum walk taking place in the orbital angular momentum space of light, both for a single photon and for two simultaneous photons. In contrast to previous implementations, the whole process develops in a single light beam, with no need of interferometers; it requires optical resources scaling linearly with the number of steps; and it allows flexible control of input and output superposition states. Exploiting the latter property, we also simulated the quantum dynamics of Gaussian wavepackets, exploring the system dispersion relation in momentum space and the associated spin-orbit topological features. Our demonstration introduces a novel versatile photonic platform for quantum simulations.

Filippo Cardano; Francesco Massa; Hammam Qassim; Ebrahim Karimi; Sergei Slussarenko; Domenico Paparo; Corrado de Lisio; Fabio Sciarrino; Enrico Santamato; Robert W. Boyd; Lorenzo Marrucci

2014-07-21T23:59:59.000Z

387

Photonic band gap of a graphene-embedded quarter-wave stack  

SciTech Connect

Here, we present a mechanism for tailoring the photonic band structure of a quarter-wave stack without changing its physical periods by embedding conductive sheets. Graphene is utilized and studied as a realistic, two-dimensional conductive sheet. In a graphene-embedded quarter-wave stack, the synergic actions of Bragg scattering and graphene conductance contributions open photonic gaps at the center of the reduced Brillouin zone that are nonexistent in conventional quarter-wave stacks. Such photonic gaps show giant, loss-independent density of optical states at the fixed lower-gap edges, of even-multiple characteristic frequency of the quarter-wave stack. The conductive sheet-induced photonic gaps provide a platform for the enhancement of light-matter interactions.

Fan, Yuancheng [Ames Laboratory; Wei, Zeyong [Tongji University; Li, Hongqiang [Tongji University; Chen, Hong [Tongji University; Soukoulis, Costas M [Ames Laboratory

2013-12-10T23:59:59.000Z

388

Distillation of mixed-state continuous-variable entanglement by photon subtraction  

SciTech Connect

We present a detailed theoretical analysis for the distillation of one copy of a mixed two-mode continuous-variable entangled state using beam splitters and coherent photon-detection techniques, including conventional on-off detectors and photon-number-resolving detectors. The initial Gaussian mixed-entangled states are generated by transmitting a two-mode squeezed state through a lossy bosonic channel, corresponding to the primary source of errors in current approaches to optical quantum communication. We provide explicit formulas to calculate the entanglement in terms of logarithmic negativity before and after distillation, including losses in the channel and the photon detection, and show that one-copy distillation is still possible even for losses near the typical fiber channel attenuation length. A lower bound for the transmission coefficient of the photon-subtraction beam splitter is derived, representing the minimal value that still allows to enhance the entanglement.

Zhang Shengli; Loock, Peter van [Optical Quantum Information Theory Group, Max Planck Institute for the Science of Light, Guenther-Scharowsky-Str. 1/Bau 26, D-91058 Erlangen (Germany) and Institute of Theoretical Physics I, Universitaet Erlangen-Nuernberg, Staudstr. 7/B2, D-91058 Erlangen (Germany)

2010-12-15T23:59:59.000Z

389

Partial angular coherence and the angular Schmidt spectrum of entangled two-photon fields  

SciTech Connect

We study partially coherent fields that have a coherent-mode representation in the orbital-angular-momentum-mode basis. For such fields, we introduce the concepts of the angular coherence function and the coherence angle. Such fields are naturally produced by the process of parametric down-conversion--a second-order nonlinear optical process in which a pump photon breaks up into two entangled photons, known as the signal and idler photons. We show that the angular coherence functions of the signal and idler fields are directly related to the angular Schmidt (spiral) spectrum of the down-converted two-photon field and thus that the angular Schmidt spectrum can be measured directly by measuring the angular coherence function of either the signal or the idler field, without requiring coincidence detection.

Jha, Anand Kumar; Boyd, Robert W. [Institute of Optics, University of Rochester, Rochester, New York 14627 (United States); Agarwal, Girish S. [Department of Physics, Oklahoma State University, Stillwater, Oklahoma 74078 (United States)

2011-12-15T23:59:59.000Z

390

Nonlinear optics  

E-Print Network (OSTI)

Nicolaas Bloembergen, recipient of the Nobel Prize for Physics (1981), wrote Nonlinear Optics in 1964, when the field of nonlinear optics was only three years old. The available literature has since grown by at least three orders of magnitude.The vitality of Nonlinear Optics is evident from the still-growing number of scientists and engineers engaged in the study of new nonlinear phenomena and in the development of new nonlinear devices in the field of opto-electronics. This monograph should be helpful in providing a historical introduction and a general background of basic ideas both for expe

Bloembergen, Nicolaas

1996-01-01T23:59:59.000Z

391

Optical Expanders with Applications in Optical Computing  

E-Print Network (OSTI)

Optical Expanders with Applications in Optical Computing John H. Reif \\Lambda Akitoshi Yoshida \\Lambda July 20, 1999 Abstract We describe and investigate an optical system which we call an optical expander. An optical expander elec­ trooptically expands an optical boolean pattern encoded in d bits

Reif, John H.

392

Local Optical Spectroscopies for Subnanometer Spatial Resolution Chemical Imaging  

SciTech Connect

The evanescently coupled photon scanning tunneling microscopes (STMs) have special requirements in terms of stability and optical access. We have made substantial improvements to the stability, resolution, and noise floor of our custom-built visible-photon STM, and will translate these advances to our infrared instrument. Double vibration isolation of the STM base with a damping system achieved increased rigidity, giving high tunneling junction stability for long-duration and high-power illumination. Light frequency modulation with an optical chopper and phase-sensitive detection now enhance the signal-to-noise ratio of the tunneling junction during irradiation.

Weiss, Paul

2014-01-20T23:59:59.000Z

393

Apparatus for photon activation positron annihilation analysis  

DOE Patents (OSTI)

Non-destructive testing apparatus according to one embodiment of the invention comprises a photon source. The photon source produces photons having predetermined energies and directs the photons toward a specimen being tested. The photons from the photon source result in the creation of positrons within the specimen being tested. A detector positioned adjacent the specimen being tested detects gamma rays produced by annihilation of positrons with electrons. A data processing system operatively associated with the detector produces output data indicative of a lattice characteristic of the specimen being tested.

Akers, Douglas W. (Idaho Falls, ID)

2007-06-12T23:59:59.000Z

394

Video Library | Advanced Photon Source  

NLE Websites -- All DOE Office Websites (Extended Search)

Media Center: Media Center: Calendar of Events APS News User News Article Archives APS Brochure Annual Reports Posters Podcasts Image Gallery external site Video Library Syndicated Feeds (RSS) Featured Videos: Introduction to the Advanced Photon Source The Advanced Photon Source An introduction and overview of the technology that produces the brightest x-ray beams in the Western Hemisphere, and the research carried out by scientists using those x-rays. Timelapse of the APS construction Building the APS A timelapse video from 1990-1995 that shows the Advanced Photon Source rising from an empty field to become the site of a national synchrotron x-ray research facility. Physics of the Blues Physics of the Blues In looking at commonalities between music and science, former PSC Director

395

A stable frequency comb directly referenced to rubidium electromagnetically induced transparency and two-photon transitions  

SciTech Connect

We demonstrate an approach to create a stable erbium-fiber-based frequency comb at communication band by directly locking the combs to two rubidium atomic transitions resonances (electromagnetically induced transparency absorption and two-photon absorption), respectively. This approach directly transfers the precision and stability of the atomic transitions to the comb. With its distinguishing feature of compactness by removing the conventional octave-spanning spectrum and f-to-2f beating facilities and the ability to directly control the comb's frequency at the atomic transition frequency, this stable optical comb can be widely used in optical communication, frequency standard, and optical spectroscopy and microscopy.

Hou, Dong; Wu, Jiutao; Zhang, Shuangyou; Ren, Quansheng; Zhang, Zhigang; Zhao, Jianye, E-mail: zhaojianye@pku.edu.cn [Department of Electronics, Peking University, Beijing, 100871 (China)

2014-03-17T23:59:59.000Z

396

Atomic, Molecular & Optical Sciences  

NLE Websites -- All DOE Office Websites (Extended Search)

Atomic, Molecular and Optical Sciences Atomic, Molecular and Optical Sciences The goal of the program is to understand the structure and dynamics of atoms and molecules using photons and ions as probes. The current program is focussed on studying inner-shell photo-ionization and photo-excitation of atoms and molecules, molecular orientation effects in slow collisions, slowing and cooling molecules, and X-ray photo-excitation of laser-dressed atoms. The experimental and theoretical efforts are designed to break new ground and to provide basic knowledge that is central to the programmatic goals of the Department of Energy (DOE). Unique LBNL facilities such as the Advanced Light Source (ALS), the ECR ion sources at the 88-inch cyclotron, and the National Energy Research Scientific Computing Center (NERSC) are

397

Optical geometry across the horizon  

E-Print Network (OSTI)

In a companion paper (Jonsson and Westman, Class. Quantum Grav. 23 (2006) 61), a generalization of optical geometry, assuming a non-shearing reference congruence, is discussed. Here we illustrate that this formalism can be applied to a finite four-volume of any spherically symmetric spacetime. In particular we apply the formalism, using a non-static reference congruence, to do optical geometry across the horizon of a static black hole. While the resulting geometry in principle is time dependent, we can choose the reference congruence in such a manner that an embedding of the geometry always looks the same. Relative to the embedded geometry the reference points are then moving. We discuss the motion of photons, inertial forces and gyroscope precession in this framework.

Rickard Jonsson

2007-08-19T23:59:59.000Z

398

Massive photons and Lorentz violation  

E-Print Network (OSTI)

All quadratic translation- and gauge-invariant photon operators for Lorentz breakdown are included into the Stueckelberg Lagrangian for massive photons in a generalized \\xi-gauge. The corresponding dispersion relation and tree-level propagator are determined exactly, and some leading-order results are derived. The question of how to include such Lorentz-violating effects into a perturbative quantum-field expansion is addressed. Applications of these results within Lorentz-breaking quantum field theories include the regularization of infrared divergences as well as the free propagation of massive vector bosons.

Mauro Cambiaso; Ralf Lehnert; Robertus Potting

2012-01-14T23:59:59.000Z

399

Sub-femtosecond determination of transmission delay times for a dielectric mirror (photonic bandgap) as a function of angle of incidence  

E-Print Network (OSTI)

Using a two-photon interference technique, we measure the delay for single-photon wavepackets to be transmitted through a multilayer dielectric mirror, which functions as a ``photonic bandgap'' medium. By varying the angle of incidence, we are able to confirm the behavior predicted by the group delay (stationary phase approximation), including a variation of the delay time from superluminal to subluminal as the band edge is tuned towards to the wavelength of our photons. The agreement with theory is better than 0.5 femtoseconds (less than one quarter of an optical period) except at large angles of incidence. The source of the remaining discrepancy is not yet fully understood.

Aephraim M. Steinberg; Raymond Y. Chiao

1995-01-16T23:59:59.000Z

400

Photonic microwave generation with high-power photodiodes  

E-Print Network (OSTI)

We utilize and characterize high-power, high-linearity modified uni-traveling carrier (MUTC) photodiodes for low-phase-noise photonic microwave generation based on optical frequency division. When illuminated with picosecond pulses from a repetition-rate-multiplied gigahertz Ti:sapphire modelocked laser, the photodiodes can achieve 10 GHz signal power of +14 dBm. Using these diodes, a 10 GHz microwave tone is generated with less than 500 attoseconds absolute integrated timing jitter (1 Hz-10 MHz) and a phase noise floor of -177 dBc/Hz. We also characterize the electrical response, amplitude-to-phase conversion, saturation and residual noise of the MUTC photodiodes.

Fortier, Tara M; Hati, Archita; Nelson, Craig; Taylor, Jennifer A; Fu, Yang; Campbell, Joe; Diddams, Scott A

2013-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "regional optics photonics" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


401

Widely tunable femtosecond solitonic radiation in photonic crystal fiber cladding  

SciTech Connect

We report on a means to generate tunable ultrashort optical pulses. We demonstrate that dispersive waves generated by solitons within the small-core features of a photonic crystal fiber cladding can be used to obtain femtosecond pulses tunable over an octave-wide spectral range. The generation process is highly efficient and occurs at the relatively low laser powers available from a simple Ti:sapphire laser oscillator. The described phenomenon is general and will play an important role in other systems where solitons are known to exist.

Peng Jiahui; Sokolov, Alexei V. [Department of Physics and Institute for Quantum Studies, Texas A and M University, College Station, Texas 77843 (United States); Benabid, F.; Light, P. S.; Couny, F. [Department of Physics, University of Bath, Bath, BA2 7AY (United Kingdom); Biancalana, F. [School of Physics and Astronomy, Cardiff University, CF24 3 AA Cardiff (United Kingdom); Roberts, P. J. [DTU Fotonik, Danish Technical University, Lyngby, DK-2800 (Denmark)

2010-03-15T23:59:59.000Z

402

An ion trap built with photonic crystal fibre technology  

E-Print Network (OSTI)

We demonstrate a surface-electrode ion trap fabricated using techniques transferred from the manufacture of photonic-crystal fibres. This provides a relatively straightforward route for realizing traps with an electrode structure on the 100 micron scale with high optical access. We demonstrate the basic functionality of the trap by cooling a single ion to the quantum ground state, allowing us to measure a heating rate from the ground state of 787(24) quanta/s. Variation of the fabrication procedure used here may provide access to traps in this geometry with trap scales between 100 um and 10 um.

Lindenfelser, F; Kienzler, D; Bykov, D; Uebel, P; Schmidt, M A; Russell, P St J; Home, J P

2015-01-01T23:59:59.000Z

403

Effect of window reflections on photonic Doppler velocimetry measurements  

SciTech Connect

Photonic Doppler velocimetry (PDV) has rapidly become a standard diagnostic for measuring velocities in dynamic compression research. While free surface velocity measurements are fairly straightforward, complications occur when PDV is used to measure a dynamically loaded sample through a window. Fresnel reflections can severely affect the velocity and time resolution of PDV measurements, especially for low-velocity transients. Shock experiments of quartz compressed between two sapphire plates demonstrate how optical window reflections cause ringing in the extracted PDV velocity profile. Velocity ringing is significantly reduced by using either a wedge window or an antireflective coating.

Ao, T.; Dolan, D. H. [Sandia National Laboratories, Albuquerque, New Mexico 87185 (United States)

2011-02-15T23:59:59.000Z

404

Waveguide integrated low noise NbTiN nanowire single-photon detectors with milli-Hz dark count rate  

E-Print Network (OSTI)

Superconducting nanowire single-photon detectors are an ideal match for integrated quantum photonic circuits due to their high detection efficiency for telecom wavelength photons. Quantum optical technology also requires single-photon detection with low dark count rate and high timing accuracy. Here we present very low noise superconducting nanowire single-photon detectors based on NbTiN thin films patterned directly on top of Si3N4 waveguides. We systematically investigate a large variety of detector designs and characterize their detection noise performance. Milli-Hz dark count rates are demonstrated over the entire operating range of the nanowire detectors which also feature low timing jitter. The ultra-low dark count rate, in combination with the high detection efficiency inherent to our traveling wave detector geometry, gives rise to a measured noise equivalent power at the 10^(-20) W/Hz^(1/2) level.

Carsten Schuck; Wolfram H. P. Pernice; Hong X. Tang

2013-06-02T23:59:59.000Z

405

Integrated resonant micro-optical gyroscope and method of fabrication  

DOE Patents (OSTI)

An integrated optic gyroscope is disclosed which is based on a photonic integrated circuit (PIC) having a bidirectional laser source, a pair of optical waveguide phase modulators and a pair of waveguide photodetectors. The PIC can be connected to a passive ring resonator formed either as a coil of optical fiber or as a coiled optical waveguide. The lasing output from each end of the bidirectional laser source is phase modulated and directed around the passive ring resonator in two counterpropagating directions, with a portion of the lasing output then being detected to determine a rotation rate for the integrated optical gyroscope. The coiled optical waveguide can be formed on a silicon, glass or quartz substrate with a silicon nitride core and a silica cladding, while the PIC includes a plurality of III V compound semiconductor layers including one or more quantum well layers which are disordered in the phase modulators and to form passive optical waveguides.

Vawter, G. Allen (Albuquerque, NM); Zubrzycki, Walter J. (Sandia Park, NM); Guo, Junpeng (Albuquerque, NM); Sullivan, Charles T. (Albuquerque, NM)

2006-09-12T23:59:59.000Z

406

The large-area hybrid-optics CLAS12 RICH detector: Tests of innovative components  

SciTech Connect

A large area ring-imaging Cherenkov detector has been designed to provide clean hadron identification capability in the momentum range from 3 GeV/c to 8 GeV/c for the CLAS12 experiments at the upgraded 12 GeV continuous electron beam accelerator facility of Jefferson Lab to study the 3D nucleon structure in the yet poorly explored valence region by deep-inelastic scattering, and to perform precision measurements in hadronization and hadron spectroscopy. The adopted solution foresees a novel hybrid optics design based on an aerogel radiator, composite mirrors and densely packed and highly segmented photon detectors. Cherenkov light will either be imaged directly (forward tracks) or after two mirror reflections (large angle tracks). The preliminary results of individual detector component tests and of the prototype performance at test-beams are reported here.

Contalbrigo, M.; Baltzell, N.; Benmokhtar, F.; Barion, L.; Cisbani, E.; El Alaoui, A.; Hafidi, K.; Hoek, M.; Kubarovsky, V.; Lagamba, L.; Lucherini, V.; Malaguti, R.; Mirazita, M.; Montgomery, R.; Movsisyan, A.; Musico, P.; Orecchini, D.; Orlandi, A.; Pappalardo, L.L.; Pereira, S.; Perrino, R.; Phillips, J.; Pisano, S.; Rossi, P.; Squerzanti, S.; Tomassini, S.; Turisini, M.; Viticchi, A.

2014-07-01T23:59:59.000Z

407

Investigation of optical limiting properties of Aluminium nanoparticles prepared by pulsed laser ablation in different carrier media  

SciTech Connect

In this communication, we carried out the systematic investigation of nonlinear absorption and scattering properties of Aluminium nanoparticles (Al NPs) in various polar and non-polar solvents. Al NPs were synthesized with pulsed Nd:YAG laser operated at 1064 nm by ablating Al target in polar and non-polar liquid environment like chloroform, chlorobenzene, toluene, benzene, and carbon tetrachloride. Synthesized Al NPs colloids of various solvents differ in appearance and UV-Vis extinction spectra exhibit absorption in the UV region. The characterization of Al NPs performed by Transmission electron microscopy (TEM) studies reveal that NPs are made up of a well crystallized Al inner part (bright zone) embedded with an amorphous metal Al shell (dark region). Growth, aggregation, and precipitation mechanisms which influence the optical properties and stability of NPs are found to be related to the dipole moment of the surrounding liquid environment. The nonlinear absorption and scattering studies are performed by open aperture Z-scan technique with 532 nm under nanosecond pulse excitation. The Z-scan measurements are fitted theoretically to estimate both two-photon absorption (TPA) and nonlinear scattering (NLS) coefficients. In polar solvents like chlorobenzene, chloroform synthesized Al NPs exhibited higher TPA, NLS coefficient values, and lower optical limiting threshold values in comparison with partially polar solvent like toluene and non-polar solvents like benzene and carbontetrachloride. These results indicate the potential use of Al NPs as a versatile optical limiting material.

Kuladeep, Rajamudili; Jyothi, L.; Narayana Rao, D. [School of Physics, University of Hyderabad, Prof. C. R. Rao Road, Hyderabad 500046 (India)] [School of Physics, University of Hyderabad, Prof. C. R. Rao Road, Hyderabad 500046 (India); Prakash, P.; Mayank Shekhar, S. [Center of Excellence in Lasers and Optoelectronic Sciences, International School of Photonics, Cochin University of Science and Technology, Kochi (India)] [Center of Excellence in Lasers and Optoelectronic Sciences, International School of Photonics, Cochin University of Science and Technology, Kochi (India); Durga Prasad, M. [Center for Nanotechnology, University of Hyderabad, Prof. C. R. Rao Road, Hyderabad 500046 (India)] [Center for Nanotechnology, University of Hyderabad, Prof. C. R. Rao Road, Hyderabad 500046 (India)

2013-12-28T23:59:59.000Z

408

Modeling photonic links in Verilog-A  

E-Print Network (OSTI)

Integrated photonic links are a promising emerging technology that can relieve the interconnect bottleneck in core-to-core and core-to-memory communications of modern processors. Developing and optimizing photonic link ...

Kononov, Ekaterina (Ekaterina R.)

2013-01-01T23:59:59.000Z

409

Fast scanning two-photon microscopy  

E-Print Network (OSTI)

Fast scanning two-photon microscopy coupled with the use light activated ion channels provides the basis for fast imaging and stimulation in the characterization of in vivo neural networks. A two-photon microscope capable ...

Chang, Jeremy T

2010-01-01T23:59:59.000Z

410

Photon tunnelling microscopy of polyethylene single crystals  

E-Print Network (OSTI)

Photon tunnelling microscopy of polyethylene single crystals Mohan Srinivasarao* and Richard S:photon tunnellingmicroscopy;single crystals; polyethylene) INTRODUCTION The study of morphology of polymers is an area

Srinivasarao, Mohan

411

Advanced Solar Photonics | Open Energy Information  

Open Energy Info (EERE)

Photonics Place: Lake Mary, Florida Zip: 32746 Product: Florida-based thin film PV module manufacturer. References: Advanced Solar Photonics1 This article is a stub. You can help...

412

Photo Echo and Optical Nutation in Molecules  

Science Journals Connector (OSTI)

Photon echo and optical nutation have been easily observed in C13H3F and NH2D by applying Stark pulses which shift the molecular levels into resonance with cw laser radiation. Numerical computations of the nutation effect agree with observation, and echo characteristics closely follow predictions of existing theories. The T2? pressure dependence, from infrared-echo measurements, indicates that C13H3F relaxes primarily by rotational energy transfer.

Richard G. Brewer and R. L. Shoemaker

1971-09-06T23:59:59.000Z

413

Better Randomness with Single Photons  

E-Print Network (OSTI)

Randomness is one of the most important resources in modern information science, since encryption founds upon the trust in random numbers. Since it is impossible to prove if an existing random bit string is truly random, it is relevant that they be generated in a trust worthy process. This requires specialized hardware for random numbers, for example a die or a tossed coin. But when all input parameters are known, their outcome might still be predicted. A quantum mechanical superposition allows for provably true random bit generation. In the past decade many quantum random number generators (QRNGs) were realized. A photonic implementation is described as a photon which impinges on a beam splitter, but such a protocol is rarely realized with non-classical light or anti-bunched single photons. Instead, laser sources or light emitting diodes are used. Here we analyze the difference in generating a true random bit string with a laser and with anti-bunched light. We show that a single photon source provides more r...

Oberreiter, Lukas

2014-01-01T23:59:59.000Z

414

Building the Advanced Photon Source  

SciTech Connect

This timelapse video shows the U.S. Department of Energy's Advanced Photon Source (APS) rising from an empty field at Argonne National Laboratory to become the source of the Western Hemisphere's brightest x-rays for research. The video was compiled from still photographs taken from 1990-1996.

None

2010-01-01T23:59:59.000Z

415

Energy calibration at high-energy photon colliders  

E-Print Network (OSTI)

Calibration of the absolute energy scale at high-energy photon (gamma-gamma, gamma-electron) colliders is discussed. The luminosity spectrum at photon colliders is broad and has a rather sharp high-energy edge, which can be used, for example, to measure the mass of the Higgs boson in the process gamma-gamma to H or masses of charged scalars by observing the cross-section threshold. In addition to the precise knowledge of the edge energy of the luminosity spectrum, it is even more important to have a way to calibrate the absolute energy scale of the detector. At first sight, Compton scattering itself provides a unique way to determine the beam energies and produce particles of known energies that could be used for detector calibration. The energy scale is given by the electron mass m_e and laser photon energy \\omega_0. However, this does not work at realistic photon colliders due to large nonlinear effects in Compton scattering at the conversion region (\\xi^2 \\sim 0.3). It is argued that the process gamma-elec...

Telnov, V I

2014-01-01T23:59:59.000Z

416

Position-dependent photon operators in the quantization of the electromagnetic field in dielectrics at local thermal equilibrium  

E-Print Network (OSTI)

It has very recently been suggested that asymmetric coupling of electromagnetic fields to thermal reservoirs under nonequilibrium conditions can produce unexpected oscillatory behavior in the local photon statistics in layered structures. Better understanding of the predicted phenomena could enable useful applications related to thermometry, noise filtering, and enhancing optical interactions. In this work we briefly review the field quantization and study the local steady state temperature distributions in optical cavities formed of lossless and lossy media to show that also local field temperatures exhibit oscillations that depend on position as well as the photon energy.

Mikko Partanen; Teppo Hyrynen; Jani Oksanen; Jukka Tulkki

2014-12-02T23:59:59.000Z

417

Atoms, photons, and Information Andrew Silberfarb  

E-Print Network (OSTI)

Atoms, photons, and Information by Andrew Silberfarb B.S. California Institute of Technology, 1998 #12;Atoms, photons, and Information by Andrew Silberfarb ABSTRACT OF DISSERTATION Submitted in Partial Albuquerque, New Mexico March, 2006 #12;Atoms, photons, and Information by Andrew Silberfarb B.S. California

Deutsch, Ivan H.

418

High-pT photon processes and the photon structure - results from HERA jet and prompt photon (photo)production  

E-Print Network (OSTI)

Many important QCD tests with jets and prompt photons have been performed with the experiments H1 and ZEUS at the HERA ep collider. This contribution focuses on results from jet and prompt photon photoproduction. In particular, the concept of resolved photon interactions and various jet cross sections and their sensitivity to the photon (and proton) PDFs will be discussed. In addition, recent results from prompt photon production will be shown. Finally results on multi-parton interactions and the underlying event will be presented.

Thomas Schoerner-Sadenius; for the H1; ZEUS Collaborations

2008-06-09T23:59:59.000Z

419

Optical memory  

DOE Patents (OSTI)

Optical memory comprising: a semiconductor wire, a first electrode, a second electrode, a light source, a means for producing a first voltage at the first electrode, a means for producing a second voltage at the second electrode, and a means for determining the presence of an electrical voltage across the first electrode and the second electrode exceeding a predefined voltage. The first voltage, preferably less than 0 volts, different from said second voltage. The semiconductor wire is optically transparent and has a bandgap less than the energy produced by the light source. The light source is optically connected to the semiconductor wire. The first electrode and the second electrode are electrically insulated from each other and said semiconductor wire.

Mao, Samuel S; Zhang, Yanfeng

2013-07-02T23:59:59.000Z

420

Center for Optoelectronics and Photonics PaderbornCenter for Optoelectronics and Photonics Paderborn GraduateGraduate ProgramProgram  

E-Print Network (OSTI)

Center for Optoelectronics and Photonics PaderbornCenter for Optoelectronics and Photonics in Optoelectronics and PhotonicsOptoelectronics and Photonics Waveguide-Coupled SiON-Microresonators(Project B3) Prof

Noé, Reinhold

Note: This page contains sample records for the topic "regional optics photonics" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


421

Loss of polarization entanglement in a fiber-optic system with polarization mode dispersion in one optical path  

E-Print Network (OSTI)

We characterize theoretically and experimentally the degradation of polarization entanglement in a fiber-optic entanglement distribution system where one of the optical fibers is exposed to the effects of polarization mode dispersion (PMD). We show gradual reduction of entanglement with increasing PMD and find that the highest PMD tolerance is achieved when the bandwidth of the pump used to generate the entangled photons in a $\\chi^{(3)}$ process is approximately half the bandwidth of the quantum channels.

Misha Brodsky; Elizabeth C. George; Cristian Antonelli; Mark Shtaif

2010-11-26T23:59:59.000Z

422

Photon Sciences | About Photon Sciences | Information for the General  

NLE Websites -- All DOE Office Websites (Extended Search)

About Photon Sciences About Photon Sciences The human eye can see only visible light. It comes in the form of different wavelengths. These wavelengths are what create the colors of the rainbow. Other wavelengths of lights are not visible to the human eye. Although, we cannot see them, these types of light are also used in our everyday life. For example, a TV remote control uses infrared light to adjust the volume or change the channel of the TV. Airport scanners use x-rays to scan luggage. Tanning lamps use ultraviolet light to tan the skin. Microwave ovens use microwaves to cook your food. A synchrotron is a huge machine that produces very bright light of many different wavelengths. The light is much brighter than that found in your TV remote, microwave oven, or dentist's x-ray machine because the

423

Photon Sciences | About Photon Sciences | Information for Teachers  

NLE Websites -- All DOE Office Websites (Extended Search)

Photon Sciences Educational Opportunities Photon Sciences Educational Opportunities Teachers and students are welcome to experience science first hand at NSLS and NSLS-II. We work primarily in partnership with Brookhaven Lab's Office of Educational Programs, which coordinates programs aimed at boosting teachers' content knowledge and improving student achievement in science, technology, engineering, and mathematics (STEM). These programs help motivate and prepare all students, especially minorities and females, and address the serious under representation of minorities and females in STEM careers. A diverse workforce of scientists, engineers, and educators will help keep America at the forefront of innovation. InSynC InSynC, launched in 2010, enables high school teachers and students to gain remote access to experiments with synchrotron beam time through a

424

Emission of Microwave Photon Pairs by a Tunnel Junction  

E-Print Network (OSTI)

Generation and control of non-classical electromagnetic fields is of crucial importance for quantum information physics. While usual methods for the production of such fields rely on a non-linearity (of a crystal, a Josephson junction, etc.), a recent experiment performed on a normal conductor, a tunnel junction under microwave irradiation, has unveiled an alternative: the use of electron shot noise in a quantum conductor\\cite{PAN_squeezing}. Here we show that such a device can emit \\emph{pairs of microwave photons} of different frequencies with a rate as high as that of superconducting Josephson junctions\\cite{Flurin}. This results in intensity fluctuations of the photon field at two different frequencies being correlated below the photon shot noise,i.e. two-mode amplitude squeezing. Our experiment constitutes a fundamental step towards the understanding of electronic noise in terms of quantum optics, and shows that even a normal conductor could be used as a resource for quantum information processing.

Jean-Charles Forgues; Christian Lupien; Bertrand Reulet

2014-03-21T23:59:59.000Z

425

Envelope and phase evolution of femtosecond pulses in hollow photonic-crystal fibres  

SciTech Connect

Changes in the envelope and the evolution of the spectral phase and chirp of femtosecond pulses propagating through hollow fibres with a photonic-crystal cladding are experimentally studied. Envelope and phase distortions of ultrashort pulses transmitted through such fibres are shown to be controlled by the detuning of the carrier frequency of laser pulses from the central frequency of the passband in the transmission of the fibre. Near the passband edges, which map the edges of photonic band gaps of the fibre cladding, ultrashort pulses transmitted through the fibre display considerable envelope distortions, as well as frequency- and time-dependent phase shifts. (optical fibres)

Konorov, Stanislav O [Department of Physics, M.V. Lomonosov Moscow State University, Moscow (Russian Federation); Fedotov, Andrei B; Zheltikov, Aleksei M [International Laser Center, M. V. Lomonosov Moscow State University, Moscow (Russian Federation); Beloglazov, V I; Skibina, N B; Shcherbakov, Andrei V [Institute of Technology and Processing of Glass Structures, Russian Academy of Sciences, Saratov (Russian Federation)

2004-01-31T23:59:59.000Z

426

Photonic band gaps in three-dimensional network structures with short-range order  

SciTech Connect

We present a systematic study of photonic band gaps (PBGs) in three-dimensional (3D) photonic amorphous structures (PASs) with short-range order. From calculations of the density of optical states (DOS) for PASs with different topologies, we find that tetrahedrally connected dielectric networks produce the largest isotropic PBGs. Local uniformity and tetrahedral order are essential to the formation of PBGs in PASs, in addition to short-range geometric order. This work demonstrates that it is possible to create broad, isotropic PBGs for vector light fields in 3D PASs without long-range order.

Liew, Seng Fatt; Noh, Heeso [Department of Applied Physics, Yale University, New Haven, Connecticut 06511 (United States); Yang, Jin-Kyu [Department of Applied Physics, Yale University, New Haven, Connecticut 06511 (United States); Department of Optical Engineering, Kongju National University, Kongju 314-701 (Korea, Republic of); Schreck, Carl F. [Department of Physics, Yale University, New Haven, Connecticut 06511 (United States); Dufresne, Eric R. [Department of Physics, Yale University, New Haven, Connecticut 06511 (United States); Department of Mechanical Engineering and Materials Science, Yale University, New Haven, Connecticut 06511 (United States); Department of Chemical and Environmental Engineering, Yale University, New Haven, Connecticut 06511 (United States); Department of Cell Biology, Yale University, New Haven, Connecticut 06511 (United States); O'Hern, Corey S. [Department of Physics, Yale University, New Haven, Connecticut 06511 (United States); Department of Mechanical Engineering and Materials Science, Yale University, New Haven, Connecticut 06511 (United States); Cao, Hui [Department of Applied Physics, Yale University, New Haven, Connecticut 06511 (United States); Department of Physics, Yale University, New Haven, Connecticut 06511 (United States)

2011-12-15T23:59:59.000Z

427

Numerical aperture influence on 3-D multi-layer optical data storage systems , Edwin P. Walkera  

E-Print Network (OSTI)

Numerical aperture influence on 3-D multi-layer optical data storage systems Yi Zhanga* , Edwin P storage system is analyzed. Keywords: NA, multi-layer data storage, two-photon recording, capacity) 550-0596, Fax: (858) 550-0917 #12;Numerical aperture influence on 3-D multi-layer optical data storage

Esener, Sadik C.

428

Optical Absorption and Photoluminescence Excitation Spectroscopy of SWNTs S. Maruyama1  

E-Print Network (OSTI)

Optical Absorption and Photoluminescence Excitation Spectroscopy of SWNTs S. Maruyama1 , Y-mail: maruyama@photon.t.u-tokyo.ac.jp Optical absorption and photoluminescence excitation (PLE) spectroscopy to the physical interest in unique excitonic features of 1-D material [3-5], clear identification of absorption

Maruyama, Shigeo

429

WFC -New Optical Approaches for Microwave, High-Speed Signal Transmission IEEE MTT-S 2006  

E-Print Network (OSTI)

Photonics M. Izutsu et al., National Institute of Information and Communications Technology, Tokyo, Japan 9 Applications K.-I. Kitayama et al., Osaka University, Osaka, Japan 11:00 AM High-Speed InP Transistors Office To other building Household Antenna base station Optical fiber Optical fiber Underground shopping

Choi, Woo-Young

430

Center of mass energy and system-size dependence of photon production at forward rapidity at RHIC  

SciTech Connect

We present the multiplicity and pseudorapidity distributions of photons produced in Au+Au and Cu+Cu collisions at {radical}s{sub NN} = 62.4 and 200 GeV. The photons are measured in the region -3.7 < {eta} < -2.3 using the photon multiplicity detector in the STAR experiment at RHIC. The number of photons produced per average number of participating nucleon pairs increases with the beam energy and is independent of the collision centrality. For collisions with similar average numbers of participating nucleons the photon multiplicities are observed to be similar for Au+Au and Cu+Cu collisions at a given beam energy. The ratios of the number of charged particles to photons in the measured pseudorapidity range are found to be 1.4 {+-} 0.1 and 1.2 {+-} 0.1 for {radical}s{sub NN} = 62.4 GeV and 200 GeV, respectively. The energy dependence of this ratio could reflect varying contributions from baryons to charged particles, while mesons are the dominant contributors to photon production in the given kinematic region. The photon pseudorapidity distributions normalized by average number of participating nucleon pairs, when plotted as a function of {eta} - ybeam, are found to follow a longitudinal scaling independent of centrality and colliding ion species at both beam energies.

STAR Collaboration; Abelev, Betty

2010-07-05T23:59:59.000Z

431

Stochastic conversions of TeV photons into axion-like particles in extragalactic magnetic fields  

SciTech Connect

Very-high energy photons emitted by distant cosmic sources are absorbed on the extragalactic background light (EBL) during their propagation. This effect can be characterized in terms of a photon transfer function at Earth. The presence of extragalactic magnetic fields could also induce conversions between very high-energy photons and hypothetical axion-like particles (ALPs). The turbulent structure of the extragalactic magnetic fields would produce a stochastic behaviour in these conversions, leading to a statistical distribution of the photon transfer functions for the different realizations of the random magnetic fields. To characterize this effect, we derive new equations to calculate the mean and the variance of this distribution. We find that, in presence of ALP conversions, the photon transfer functions on different lines of sight could have relevant deviations with respect to the mean value, producing both an enhancement or a suppression in the observable photon flux with respect to the expectations with only absorption. As a consequence, the most striking signature of the mixing with ALPs would be a reconstructed EBL density from TeV photon observations which appears to vary over different directions of the sky: consistent with standard expectations in some regions, but inconsistent in others.

Mirizzi, Alessandro [Max-Planck-Institut fr Physik (Werner Heisenberg Institut), Fhringer Ring 6, 80805 Mnchen (Germany); Montanino, Daniele, E-mail: amirizzi@mppmu.mpg.de, E-mail: daniele.montanino@le.infn.it [Dipartimento di Fisica, Universit del Salento and Sezione INFN di Lecce, Via Arnesano, I73100 Lecce (Italy)

2009-12-01T23:59:59.000Z

432

Sequential optical pumping of a far-infrared ammonia laser  

SciTech Connect

We present a novel technique for resonantly pumping a continuous-wave far-infrared NH{sub 3} laser with a line-tunable mid-infrared NH{sub 3} laser that is optically pumped by a CO{sub 2} laser. In this two-step process we first convert 10-{mu}m CO{sub 2} laser photons into 11{endash}13-{mu}m NH{sub 3} laser photons, which are then converted into 60{endash}400-{mu}m photons in a far-infrared NH{sub 3} laser. Continuous-wave laser action on 10 far-infrared lines of {sup 15}NH{sub 3}, including four new ones, has been obtained with a single CO{sub 2} laser pump line. {copyright} {ital 1996 Optical Society of America.}

Tachikawa, M.; Evenson, K.M. [Time and Frequency Division, National Institute of Standards and Technology, 325 Broadway, Boulder, Colorado 80303 (United States)

1996-08-01T23:59:59.000Z

433

Optical microcavity with semiconducting single-wall carbon nanotubes  

E-Print Network (OSTI)

Optical microcavity with semiconducting single- wall carbon nanotubes Etienne Gaufrès,1 Nicolas-Perot microcavities based on semiconducting single-wall carbon nanotubes with a quality factor of 160. We properties References and links 1. P. Avouris, M. Freitag and V. Perebeinos, "Carbon nanotube photonics

Paris-Sud XI, Université de

434

INSTITUTE OF PHYSICS PUBLISHING JOURNAL OF OPTICS A: PURE AND APPLIED OPTICS J. Opt. A: Pure Appl. Opt. 3 (2001) S103S120 PII: S1464-4258(01)27690-9  

E-Print Network (OSTI)

INSTITUTE OF PHYSICS PUBLISHING JOURNAL OF OPTICS A: PURE AND APPLIED OPTICS J. Opt. A: Pure Appl. Opt. 3 (2001) S103­S120 PII: S1464-4258(01)27690-9 Photonic bandgap materials: towards an all-optical September 2001 Published 26 October 2001 Online at stacks.iop.org/JOptA/3/S103 Abstract We describe all-optical

John, Sajeev

435

APS Upgrade | Advanced Photon Source  

NLE Websites -- All DOE Office Websites (Extended Search)

Workshop on new science opportunities provided by a multi-bend achromat lattice at the APS APS-U MBA Lattice Workshop Registration is now closed. Please contact Diane Wilkinson ext. 7810 or a member of the Workshop Organizing Committee for changes or modifications to your registration. Submit Comments, Suggestions, and Ideas for MBA Lattice Workshop October 21-22 Advanced Photon Source Argonne National Lab The Advanced Photon Source Upgrade is focused on delivering a powerful, versatile facility for science using high-brightness, high-energy X-rays. At APS, and around the light source community, scientists have been developing storage ring designs that push closer to the ultimate diffraction limit for X-ray sources. A recent report by the Basic Energy Sciences Advisory Committee, which advises the Director of the U.S.

436

Lightwave Photonics | Open Energy Information  

Open Energy Info (EERE)

Photonics Photonics Place Encinitas, California Zip 92024 Product California-based LED chip manufacturer startup. Coordinates 33.045436°, -117.292518° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":33.045436,"lon":-117.292518,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

437

High flux photon beam monitor  

SciTech Connect

We have designed two photon beam position monitors for use on our x-ray storage ring beam lines. In both designs, a pair of tungsten blades, separated by a pre-determined gap, intercepts a small fraction of the incoming beam. Due to photoemission, an electrical signal is generated which is proportional to the amount of beam intercepted. The thermal load deposited in the blade is transferred by a heat pipe to a heat exchanger outside the vacuum chamber. A prototype monitor with gap adjustment capability was fabricated and tested at a uv beam line. The results show that the generated electrical signal is a good measurement of the photon beam position. In the following sections, design features and test results are discussed.

Mortazavi, P.; Woodle, M.; Rarback, H.; Shu, D.; Howells, M.

1985-01-01T23:59:59.000Z

438

CAPITAL REGION  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

t 09/20/07 15:28 FAX 301 903 4656 t 09/20/07 15:28 FAX 301 903 4656 CAPITAL REGION 0 j002 SDOE F 1325.8 (8-89) EFG (0790) Energy United States Government Department of Energy Memorandum DATE. September 18, 2007 Audit Report No.: OAS-L-07-23 REPLY TO: IG-34 (A07TG036) SUBJECT: Evaluation of "The Federal Energy Regulatory Commission's Cyber Security Program-2007" TO: Chairman, Federal Energy Regulatory Commission The purpose of this report is to inform you of the results o Four evaluation of the Federal Energy Regulatory Commission's (Commission) cyber security program. The evaluation was initiated in May 2007, and our fieldwork was conducted through September 2007. Our methodology is described in the attachment to this report. . INTRODUCTION AND OBJECTIVE The Commission reports that it is constantly improving thl stability, reliability, and

439

The X-ray Position and Optical Counterpart of the Accretion-Powered Millisecond Pulsar XTE J1814-338  

E-Print Network (OSTI)

We report the precise optical and X-ray localization of the 3.2 ms accretion-powered X-ray pulsar XTE J1814-338 with data from the Chandra X-Ray Observatory as well as optical observations conducted during the 2003 June discovery outburst. Optical imaging of the field during the outburst of this soft X-ray transient reveals an R = 18 star at the X-ray position. This star is absent (R > 20) from an archival 1989 image of the field and brightened during the 2003 outburst, and we therefore identify it as the optical counterpart of XTE J1814-338. The best source position derived from optical astrometry is R.A. = 18h13m39.s04, Dec.= -33d46m22.3s (J2000). The featureless X-ray spectrum of the pulsar in outburst is best fit by an absorbed power-law (with photon index = 1.41 +- 0.06) plus blackbody (with kT = 0.95 +- 0.13 keV) model, where the blackbody component contributes approximately 10% of the source flux. The optical broad-band spectrum shows evidence for an excess of infrared emission with respect to an X-ray heated accretion disk model, suggesting a significant contribution from the secondary or from a synchrotron-emitting region. A follow-up observation performed when XTE J1814-338 was in quiescence reveals no counterpart to a limiting magnitude of R = 23.3. This suggests that the secondary is an M3 V or later-type star, and therefore very unlikely to be responsible for the soft excess, making synchroton emission a more reasonable candidate.

Miriam I. Krauss; Zhongxiang Wang; Allyn Dullighan; Adrienne M. Juett; David L. Kaplan; Deepto Chakrabarty; Marten H. van Kerkwijk; Danny Steeghs; Peter G. Jonker; Craig B. Markwardt

2005-03-30T23:59:59.000Z

440

H and A Discrimination using Linear Polarization of Photons at the PLC  

E-Print Network (OSTI)

First realistic estimate of the usefulness of the Photon Linear Collider with linearly polarized photons as analyzer of the CP-parity of Higgs bosons is presented. MSSM Higgs bosons H and A with 300 GeV mass, for the model parameters corresponding to the so called "LHC wedge" region, are considered. When switching from circular to linear photon polarization a significant increase in heavy quark production background, which is no longer suppressed by helicity conservation, and decrease of the Higgs boson production cross sections by a factor of two is expected. Nevertheless, after three years of Photon Linear Collider running heavy scalar and pseudoscalar Higgs bosons in MSSM can be distinguished at a 4.5 sigma level.

A. F. Zarnecki; P. Niezurawski; M. Krawczyk

2007-10-20T23:59:59.000Z

Note: This page contains sample records for the topic "regional optics photonics" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


441

April 1, 2004 / Vol. 29, No. 7 / OPTICS LETTERS 769 Enhanced linear and nonlinear optical phase response of  

E-Print Network (OSTI)

compact ring resonator evidenced by all-optical switching between output ports of a resonator to construct ring resonators in AlGaAs and probe them at a photon energy hc l 0.8 eV below the half-gap Eg 2 0 devices because they have the ability to recycle light through feedback and thus demand less physical path

Boyd, Robert W.

442

Optics and Diagnostics  

NLE Websites -- All DOE Office Websites (Extended Search)

2 14 | Next | Last Back to Index Optics Line up of optics after cleaning. Photo Number: 2013-048779...

443

One-loop photon-photon scattering in a thermal, deconfining SU(2) Yang-Mills plasma  

E-Print Network (OSTI)

For a deconfining thermal SU(2) Yang-Mills plasma we discuss the role of (anti)calorons in introducing non-thermal behavior effectively described in terms of Planck's quantum of action $\\hbar$. This non-thermality cancels exactly between the ground-state estimate and its free quasiparticle excitations. Kinematic constraints in 4-vertex scattering and the counting of radial loop variables versus the number of independent constraints on them are re-visited. Next, we consider thermal 2$\\rightarrow$ 2 one-loop scattering of the modes remaining massless upon the (anti)caloron induced adjoint Higgs mechanism (thermal ground state after spatial coarse graining). Starting with stringent analytical arguments, we are able to exclude the contribution to photon-photon scattering from diagrams containing at least one three-vertex and, in a next step, a vast majority of all possible configurations involving two four-vertices. By numerical analysis we show that the remaining contribution of the overall S channel is severely suppressed compared to that of the T and U channels, meaning that the creation of a pair of massive vector modes by a pair of photons and vice versa practically does not occur in the Yang-Mills plasma. For the T and U channels the domain of loop integration represents less than $10^{-7}$ times the volume of the unconstrained integration region. The thus introduced photon-photon correlation should affect the Cosmic Microwave Background's polarisation at low redshift. An adaption of the here-developed methods to the analysis of irreducible bubble diagrams could prove the conjecture of hep-th/0609033 on the termination of the loop expansion of thermodynamical quantities at a finite irreducible order.

Niko Krasowski; Ralf Hofmann

2014-04-18T23:59:59.000Z

444

Fiber optic probe of free electron evanescent fields in the optical frequency range  

SciTech Connect

We introduce an optical fiber platform which can be used to interrogate proximity interactions between free-electron evanescent fields and photonic nanostructures at optical frequencies in a manner similar to that in which optical evanescent fields are sampled using nanoscale aperture probes in scanning near-field microscopy. Conically profiled optical fiber tips functionalized with nano-gratings are employed to couple electron evanescent fields to light via the Smith-Purcell effect. We demonstrate the interrogation of medium energy (3050?keV) electron fields with a lateral resolution of a few micrometers via the generation and detection of visible/UV radiation in the 700300?nm (free-space) wavelength range.

So, Jin-Kyu, E-mail: js1m10@orc.soton.ac.uk; MacDonald, Kevin F. [Optoelectronics Research Centre and Centre for Photonic Metamaterials, University of Southampton, Highfield, Southampton SO17 1BJ (United Kingdom); Zheludev, Nikolay I. [Optoelectronics Research Centre and Centre for Photonic Metamaterials, University of Southampton, Highfield, Southampton SO17 1BJ (United Kingdom); Centre for Disruptive Photonic Technologies, Nanyang Technological University, Singapore 637371 (Singapore)

2014-05-19T23:59:59.000Z

445

Probing higher order correlations of the photon field with photon number resolving avalanche photodiodes  

E-Print Network (OSTI)

We demonstrate the use of two high speed avalanche photodiodes in exploring higher order photon correlations. By employing the photon number resolving capability of the photodiodes the response to higher order photon coincidences can be measured. As an example we show experimentally the sensitivity to higher order correlations for three types of photon sources with distinct photon statistics. This higher order correlation technique could be used as a low cost and compact tool for quantifying the degree of correlation of photon sources employed in quantum information science.

J. F. Dynes; Z. L. Yuan; A. W. Sharpe; O. Thomas; A. J. Shields

2011-07-15T23:59:59.000Z

446

Optical waveguide device with an adiabatically-varying width  

DOE Patents (OSTI)

Optical waveguide devices are disclosed which utilize an optical waveguide having a waveguide bend therein with a width that varies adiabatically between a minimum value and a maximum value of the width. One or more connecting members can be attached to the waveguide bend near the maximum value of the width thereof to support the waveguide bend or to supply electrical power to an impurity-doped region located within the waveguide bend near the maximum value of the width. The impurity-doped region can form an electrical heater or a semiconductor junction which can be activated with a voltage to provide a variable optical path length in the optical waveguide. The optical waveguide devices can be used to form a tunable interferometer (e.g. a Mach-Zehnder interferometer) which can be used for optical modulation or switching. The optical waveguide devices can also be used to form an optical delay line.

Watts; Michael R. (Albuquerque, NM), Nielson; Gregory N. (Albuquerque, NM)

2011-05-10T23:59:59.000Z

447

IOP PUBLISHING JOURNAL OF OPTICS J. Opt. 12 (2010) 010201 (1pp) doi:10.1088/2040-8978/12/1/010201  

E-Print Network (OSTI)

IOP PUBLISHING JOURNAL OF OPTICS J. Opt. 12 (2010) 010201 (1pp) doi:10 of Southampton, UK Editor-in-Chief It is a privilege to be Editor-in-Chief of Journal of Optics at this exciting · Nonlinear and ultrafast optics · Photonics at the life science interface · Information and communication

Zheludev, Nikolay

448

Parallel optical sampler  

SciTech Connect

An optical sampler includes a first and second 1.times.n optical beam splitters splitting an input optical sampling signal and an optical analog input signal into n parallel channels, respectively, a plurality of optical delay elements providing n parallel delayed input optical sampling signals, n photodiodes converting the n parallel optical analog input signals into n respective electrical output signals, and n optical modulators modulating the input optical sampling signal or the optical analog input signal by the respective electrical output signals, and providing n successive optical samples of the optical analog input signal. A plurality of output photodiodes and eADCs convert the n successive optical samples to n successive digital samples. The optical modulator may be a photodiode interconnected Mach-Zehnder Modulator. A method of sampling the optical analog input signal is disclosed.

Tauke-Pedretti, Anna; Skogen, Erik J; Vawter, Gregory A

2014-05-20T23:59:59.000Z

449

Optical Damage Threshold of Silicon for Ultrafast Infrared Pulses  

SciTech Connect

While silicon has several properties making it an attractive material for structure-based laser-driven acceleration, its optical damage threshold, a key parameter for high-gradient acceleration, has been unknown. Here we present measurements of the optical damage threshold of crystalline silicon for ultrafast pulses in the mid-infrared. The wavelengths tested span a range from the telecommunications band at 1550 nm extending longer toward the two-photon absorption threshold at around 2200 nm. We discuss the prevailing theories of ultrafast optical breakdown, describe the experimental setup and preliminary results, and propose a relevant performance parameter for candidate accelerator structures.

Cowan, B.; /SLAC

2006-09-07T23:59:59.000Z

450

Separating and combining single-mode and multimode optical beams  

DOE Patents (OSTI)

Techniques for combining initially separate single mode and multimode optical beams into a single "Dual Mode" fiber optic have been developed. Bi-directional propagation of two beams that are differentiated only by their mode profiles (i.e., wavefront conditions) is provided. The beams can be different wavelengths and or contain different modulation information but still share a common aperture. This method allows the use of conventional micro optics and hybrid photonic packaging techniques to produce small rugged packages suitable for use in industrial or military environments.

Ruggiero, Anthony J; Masquelier, Donald A; Cooke, Jeffery B; Kallman, Jeffery S

2013-11-12T23:59:59.000Z

451

Optical pumping production of spin polarized hydrogen  

SciTech Connect

There has been much interest recently in the production of large quantities of spin polarized hydrogen in various fields, including controlled fusion, quantum fluids, high energy, and nuclear physics. One promising method for the development of large quantities of spin polarized hydrogen is the utilization of optical pumping with a laser. Optical pumping is a process in which photon angular momentum is converted into electron and nuclear spin. The advent of tunable CW dye lasers (approx. 1 watt) allows the production of greater than 10/sup 18/ polarized atoms/sec. We have begun a program at Princeton to investigate the physics and technology of using optical pumping to produce large quantities of spin polarized hydrogen. Initial experiments have been done in small closed glass cells. Eventually, a flowing system, open target, or polarized ion source could be constructed.

Knize, R.J.; Happer, W.; Cecchi, J.L.

1984-09-01T23:59:59.000Z

452

Resonant high energy graviton to photon conversion at post recombination epoch  

E-Print Network (OSTI)

Resonant conversion of high energy gravitons into photons in large scale cosmological magnetic fields at the post recombination epoch is considered. It is shown that the probability of the resonance photon production is much higher than the non-resonant one. As a result an observable isotropic background of cosmic gamma rays might be created. As shown in our previous paper, an early population of primordial black holes (PBHs) prior to big bang nucleosynthesis (BBN) could be an efficient source of high frequency gravitational waves. For the primordial black hole mass about $10^8$ g the produced photons would be the dominant component of the soft to hard Cosmic X-ray Background (CXB) and for lower masses the spectrum is shifted down to the ultraviolet and optic.

Alexander D. Dolgov; Damian Ejlli

2013-03-06T23:59:59.000Z

453

Optimization of quantum interferometric metrological sensors in the presence of photon loss  

E-Print Network (OSTI)

We optimize two-mode, entangled, number states of light in the presence of loss in order to maximize the extraction of the available phase information in an interferometer. Our approach optimizes over the entire available input Hilbert space with no constraints, other than fixed total initial photon number. We optimize to maximize the Fisher information, which is equivalent to minimizing the phase uncertainty. We find that in the limit of zero loss the optimal state is the so-called N00N state, for small loss, the optimal state gradually deviates from the N00N state, and in the limit of large loss the optimal state converges to a generalized two-mode coherent state, with a finite total number of photons. The results provide a general protocol for optimizing the performance of a quantum optical interferometer in the presence of photon loss, with applications to quantum imaging, metrology, sensing, and information processing.

Tae-Woo Lee; Sean D. Huver; Hwang Lee; Lev Kaplan; Steven B. McCracken; Changjun Min; Dmitry B. Uskov; Christoph F. Wildfeuer; Georgios Veronis; Jonathan P. Dowling

2009-08-20T23:59:59.000Z

454

Fabrication of two-dimensional photonic crystals in a chalcogenide glass  

Science Journals Connector (OSTI)

Two-dimensional photonic band gap structures consisting of air holes arranged to form a hexagonal lattice were patterned into chalcogenide glass thin films by Focused Ion Beam (FIB) milling. The dimensional parameters for these structures, namely type of lattice, lattice parameter and radius of the holes, were chosen so as to show a photonic band gap relevant to the infrared range, aiming at their subsequent use in the field of chemical sensing and biosensing. The optical behaviour of these structures was determined by calculating the band structure for the TM (magnetic field in-plane) and TE (electric field in-plane) modes. Furthermore, FIB milling was used to fabricate input and output waveguides coupled to the photonic crystals. The transmission spectra of the resulting structures for the TE and TM modes with two different orientations were also calculated.

Raul J. Martin-Palma; Trevor E. Clark; Carlo G. Pantano

2009-01-01T23:59:59.000Z

455

Fabry-Perot fiber optic sensor using multimode laser diode  

E-Print Network (OSTI)

heating and cooling cycles. Also, a sporadic waveform on top of the periodic waveform is observed. This is due to mechanical drift in the feedback loop between the thermoelectric cooler and the temperature controller as previously mentioned. Fig. 11... fiber and later reaches a transducer, which takes the form of an integrated optics device, bulk optical components or a fiber optic device, placed within the sensing environment. The optical signal is modulated within the sensing region...

Chu, Siu Yi Andrew

1993-01-01T23:59:59.000Z

456

What are single photons good for?  

E-Print Network (OSTI)

In a long-held preconception, photons play a central role in present-day quantum technologies. But what are sources producing photons one by one good for precisely? Well, in opposition to what many suggest, we show that single-photon sources are not helpful for point to point quantum key distribution because faint laser pulses do the job comfortably. However, there is no doubt about the usefulness of sources producing single photons for future quantum technologies. In particular, we show how single-photon sources could become the seed of a revolution in the framework of quantum communication, making the security of quantum key distribution device independent or extending quantum communication over many hundreds of kilometers. Hopefully, these promising applications will provide a guideline for researchers to develop more and more efficient sources, producing narrowband, pure and indistinguishable photons at appropriate wavelengths.

Nicolas Sangouard; Hugo Zbinden

2012-02-02T23:59:59.000Z

457

Chirping a two-photon transition in a multistate ladder RID C-2713-2008 RID A-7617-2010  

E-Print Network (OSTI)

the Alexander von Humboldt Stif- tung and the Max-Planck-Gesellschaft for receiving the Max-Planck-Forschungspreis. CHIRPING A TWO-PHOTON TRANSITION IN A? PHYSICAL REVIEW A 76, 023417 #1;2007#2; 023417-9 #3;1#4; M. Born and E. Wolf, Principles of Optics #1...

Merkel, Wolfgang; Mack, Holger; Schleich, Wolfgang P.; Lutz, Eric; Paulus, Gerhard G.; Girard, Bertrand

2007-01-01T23:59:59.000Z

458

Optofluidic devices and applications in photonics, sensing and imaging{ Lin Pang,* H. Matthew Chen, Lindsay M. Freeman and Yeshaiahu Fainman*  

E-Print Network (OSTI)

lc40467b Optofluidics integrates the fields of photonics and microfluidics, providing new freedom scale. Optofluidics was formed only after many breakthroughs in microfluidics, as understanding of fluid adopted only after successes in the area of microfluidics with extensive efforts by optical

Fainman, Yeshaiahu

459

IEEE PHOTONICS TECHNOLOGY LETTERS, VOL. 20, NO. 13, JULY 1, 2008 1151 Low-Cost Optoelectronic Self-Injection-Locked  

E-Print Network (OSTI)

IEEE PHOTONICS TECHNOLOGY LETTERS, VOL. 20, NO. 13, JULY 1, 2008 1151 Low-Cost Optoelectronic Self by injecting 8-dBm optical signals without using any high-speed optoelectronic components. Index Terms--InP monolithic oscillator, optoelectronic oscillator (OEO), phase-noise reduction, self-injection locking (SIL

Choi, Woo-Young

460

Electrically tunable liquid-crystal photonic crystal fiber Fang Du, Yan-Qing Lu, and Shin-Tson Wua)  

E-Print Network (OSTI)

internal reflection-guiding photonic crystal fiber by filling liquid crystal into the air core and cladding an electrically tunable fiber-optical switch with over 30 dB attenuation at 60 Vrms for a He-Ne laser beam the refractive index of the core is higher than that of cladding. Therefore, the guiding mechanisms are similar

Wu, Shin-Tson

Note: This page contains sample records for the topic "regional optics photonics" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


461

Opto-electronic device for frequency standard generation and terahertz-range optical demodulation based on quantum interference  

DOE Patents (OSTI)

An opto-electronic system and technique for comparing laser frequencies with large frequency separations, establishing new frequency standards, and achieving phase-sensitive detection at ultra high frequencies are disclosed. Light responsive materials with multiple energy levels suitable for multi-photon excitation are preferably used for nonlinear mixing via quantum interference of different excitation paths affecting a common energy level. Demodulation of a carrier with a demodulation frequency up to 100`s THZ can be achieved for frequency comparison and phase-sensitive detection. A large number of materials can be used to cover a wide spectral range including the ultra violet, visible and near infrared regions. In particular, absolute frequency measurement in a spectrum from 1.25 {micro}m to 1.66 {micro}m for fiber optics can be accomplished with a nearly continuous frequency coverage. 7 figs.

Georgiades, N.P.; Polzik, E.S.; Kimble, H.J.

1999-02-02T23:59:59.000Z

462

Diffractive photon production at the LHC  

Science Journals Connector (OSTI)

In this paper we study photon production in single and double diffractive processes considering the resolved pomeron model. We estimate the rapidity and transverse momentum dependence of the cross section for the diffractive double photon and photon+jet production. A comparison with the inclusive production is presented. We predict large values for the total cross sections, which make the experimental analysis of these observables feasible at LHC energies.

C. Brenner Mariotto and V. P. Goncalves

2013-10-22T23:59:59.000Z

463

The Road to Ultrahigh-Resolution X-ray Spectrometers | Advanced Photon  

NLE Websites -- All DOE Office Websites (Extended Search)

How Atoms Behave: Characteristics of Microstructural Avalanches How Atoms Behave: Characteristics of Microstructural Avalanches Iodate Refuses to Intimidate Creating the Heart of a Planet in the Heart of a Gem How a Powerful Antibody Neutralizes HIV Taking a Page from Nature to Build Better Nanomaterials Science Highlights Archives: 2013 | 2012 | 2011 | 2010 2009 | 2008 | 2007 | 2006 2005 | 2004 | 2003 | 2002 2001 | 2000 | 1998 | Subscribe to APS Science Highlights rss feed The Road to Ultrahigh-Resolution X-ray Spectrometers NOVEMBER 22, 2011 Bookmark and Share Basic phenomena underlying the AD&AT x-ray optics. In x-ray Bragg diffraction from atomic planes composing nonzero angle η to the crystal entrance face, the crystal acts (a) like an optical prism dispersing the photons into a divergent x-ray fan with photons of different energies E

464

High performance photonic reservoir computer based on a coherently driven passive cavity  

E-Print Network (OSTI)

Reservoir computing is a recent bio-inspired approach for processing time-dependent signals. It has enabled a breakthrough in analog information processing, with several experiments, both electronic and optical, demonstrating state-of-the-art performances for hard tasks such as speech recognition, time series prediction and nonlinear channel equalization. A proof-of-principle experiment using a linear optical circuit on a photonic chip to process digital signals was recently reported. Here we present the first implementation of a photonic reservoir computer based on a coherently driven passive fiber cavity processing analog signals. Our experiment surpasses all previous experiments on a wide variety of tasks, and also has lower power consumption. Furthermore, the analytical model describing our experiment is also of interest, as it arguably constitutes the simplest high performance reservoir computer algorithm introduced so far. The present experiment, given its remarkable performances, low energy consumption...

Vinckier, Quentin; Smerieri, Anteo; Vandoorne, Kristof; Bienstman, Peter; Haelterman, Marc; Massar, Serge

2015-01-01T23:59:59.000Z

465

Optics and Optical Engineering Program Assessment Plan Program Learning Objectives  

E-Print Network (OSTI)

Optics and Optical Engineering Program Assessment Plan Program Learning, and processes that underlie optics and optical engineering. 2. Strong understanding of the fundamental science, mathematics, and processes that underlie optics and optical

Cantlon, Jessica F.

466

Periodic transmission peaks in non-periodic disordered one-dimensional photonic structures  

E-Print Network (OSTI)

A better understanding of the optical properties of a device structure characterized by a random arrangement of materials with different dielectric properties at a length scale comparable to the wavelength of light is crucial for the realization of new optical and optoelectronic devices. Here we have studied the light transmission of disordered photonic structures made with two and three different materials, characterized by the same optical thickness. In their transmission spectra a formation of peaks, with a transmission of up to 75%, is evident. The spectral position of such peaks is very regular, which is a result of the constraint that all layers have the same optical thickness. This gives rise to a manifold of applications such as new types of bandpass filters and resonators for distributed feedback lasers.

Kriegel, Ilka

2015-01-01T23:59:59.000Z

467

Multimaterial Fibers in Photonics and Nanotechnology  

Science Journals Connector (OSTI)

I will describe recent progress in leveraging multimaterial fiber fabrication technology is ushering in a new generation of unforeseen applications for fibers in photonics,...

Abouraddy, Ayman F

468

Silicon Photonics for Modulation, Switching, and Tuning  

Science Journals Connector (OSTI)

Thermal and electro-refractive silicon photonic modulators, switches, and tunable filters have been demonstrated with ultralow switching energies and high-speed operation. These...

Watts, Michael

469

Entangled-photon compressive ghost imaging  

SciTech Connect

We have experimentally demonstrated high-resolution compressive ghost imaging at the single-photon level using entangled photons produced by a spontaneous parametric down-conversion source and using single-pixel detectors. For a given mean-squared error, the number of photons needed to reconstruct a two-dimensional image is found to be much smaller than that in quantum ghost imaging experiments employing a raster scan. This procedure not only shortens the data acquisition time, but also suggests a more economical use of photons for low-light-level and quantum image formation.

Zerom, Petros [Institute of Optics, University of Rochester, Rochester, New York 14627 (United States); Chan, Kam Wai Clifford [Rochester Optical Manufacturing Company, 1260 Lyell Avenue, Rochester, New York 14606 (United States); Howell, John C. [Department of Physics and Astronomy, University of Rochester, 500 Wilson Boulevard, Rochester, New York 14627 (United States); Boyd, Robert W. [Institute of Optics, University of Rochester, Rochester, New York 14627 (United States); Department of Physics and Astronomy, University of Rochester, 500 Wilson Boulevard, Rochester, New York 14627 (United States); Department of Physics, University of Ottawa, Ottawa, Ontario, Canada K1N 6N5 (Canada)

2011-12-15T23:59:59.000Z

470

Direct photons in ATLAS@LHC  

Science Journals Connector (OSTI)

The ATLAS detector at the LHC is capable of efficiently separating photons and...?, ? and E T , either in addition to or instead of isolation cuts. This provides...

Mark D. Baker; Jiangyong Jia; Peter Steinberg

2010-12-01T23:59:59.000Z

471

Spatial wave functions of photon and electron  

SciTech Connect

The quantum mechanical model of the photon and electron is considered. The photon is conceived of as a particle moving with the speed of light which is accompanied by the wave function of the photon spreading out with an infinite speed. The wave function of the electron is introduced in terms of virtual photons tied to the electron. A description of electrostatic and magnetostatic interactions is given through the wave functions of electrons. The approach provides an explanation of the results of recent experiments measuring the speed of propagation of the bound magnetic field.

Khokhlov, D. L. [Sumy State University, R.-Korsakov St. 2, Sumy 40007 (Ukraine)

2010-12-01T23:59:59.000Z

472

Partial coherence with twin photons  

Science Journals Connector (OSTI)

An approach for calculating fourth-order coherence functions between fields produced in the parametric down-conversion process is proposed. It takes into account the transverse correlations between twin photons and is used to calculate the visibility of the interference patterns obtained in double-slit experiments with coincidence detection. The finite dimension of the light source and detectors are shown to be responsible for a kind of partial coherence which affects the visibility of the fringes. The results explain known features and predict other ones.

P. H. Souto Ribeiro

1997-11-01T23:59:59.000Z

473

Searching a Dark Photon with HADES  

E-Print Network (OSTI)

We present a search for the e+e- decay of a hypothetical dark photon, also names U vector boson, in inclusive dielectron spectra measured by HADES in the p (3.5 GeV) + p, Nb reactions, as well as the Ar (1.756 GeV/u) + KCl reaction. An upper limit on the kinetic mixing parameter squared epsilon^{2} at 90% CL has been obtained for the mass range M(U) = 0.02 - 0.55 GeV/c2 and is compared with the present world data set. For masses 0.03 - 0.1 GeV/c^2, the limit has been lowered with respect to previous results, allowing now to exclude a large part of the parameter region favoured by the muon g-2 anomaly. Furthermore, an improved upper limit on the branching ratio of 2.3 * 10^{-6} has been set on the helicity-suppressed direct decay of the eta meson, eta-> e+e-, at 90% CL.

HADES Collaboration; G. Agakishiev; A. Balanda; D. Belver; A. Belyaev; J. C. Berger-Chen; A. Blanco; M. Boehmer; J. L. Boyard; P. Cabanelas; S. Chernenko; A. Dybczak; E. Epple; L. Fabbbietti; O. Fateev; P. Finocchiaro; P. Fonte; J. Friese; I. Froehlich; T. Galatyuk; J. A. Garzon; R. Gernhaeuser; K. Goebel; M. Golubeva; D. Gonzalez-Diaz; F. Guber; M. Gumberidze; T. Heinz; T. Hennino; R. Holzmann; A. Ierusalimov; I. Iori; A. Ivashkin; M. Jurkovic; B. Kaempfer; T. Karavicheva; I. Koenig; W. Koenig; B. W. Kolb; G. Kornakov; R. Kotte; A. Krasa; F. Krizek; R. Kruecken; H. Kuc; W. Kuehn; A. Kugler; A. Kurepin; V. Ladygin; R. Lalik; S. Lang; K. Lapidus; A. Lebedev; T. Liu; L. Lopes; M. Lorenz; L. Maier; A. Mangiarotti; J. Markert; V. Metag; B. Michalska; J. Michel; C. Muentz; L. Naumann; Y. C. Pachmayer; M. Palka; Y. Parpottas; V. Pechenov; O. Pechenova; V. Petousis; J. Pietraszko; W. Przygoda; B. Ramstein; A. Reshetin; A. Rustamov; A. Sadovsky; P. Salabura; T. Scheib; H. Schuldes; A. Schmah; E. Schwab; J. Siebenson; Yu. G. Sobolev; S. Spataro; B. Spruck; H. Stroebele; J. Stroth; C. Sturm; A. Tarantola; K. Teilab; P. Tlusty; M. Traxler; R. Trebacz; H. Tsertos; T. Vasiliev; V. Wagner; M. Weber; C. Wendisch; J. Wuestenfeld; S. Yurevich; Y. Zanevsky

2013-11-01T23:59:59.000Z

474

Searching a Dark Photon with HADES  

E-Print Network (OSTI)

We present a search for the e+e- decay of a hypothetical dark photon, also names U vector boson, in inclusive dielectron spectra measured by HADES in the p (3.5 GeV) + p, Nb reactions, as well as the Ar (1.756 GeV/u) + KCl reaction. An upper limit on the kinetic mixing parameter squared epsilon^{2} at 90% CL has been obtained for the mass range M(U) = 0.02 - 0.55 GeV/c2 and is compared with the present world data set. For masses 0.03 - 0.1 GeV/c^2, the limit has been lowered with respect to previous results, allowing now to exclude a large part of the parameter region favoured by the muon g-2 anomaly. Furthermore, an improved upper limit on the branching ratio of 2.3 * 10^{-6} has been set on the helicity-suppressed direct decay of the eta meson, eta-> e+e-, at 90% CL.

Agakishiev, G; Belver, D; Belyaev, A; Berger-Chen, J C; Blanco, A; Boehmer, M; Boyard, J L; Cabanelas, P; Chernenko, S; Dybczak, A; Epple, E; Fabbbietti, L; Fateev, O; Finocchiaro, P; Fonte, P; Friese, J; Froehlich, I; Galatyuk, T; Garzon, J A; Gernhaeuser, R; Goebel, K; Golubeva, M; Gonzalez-Diaz, D; Guber, F; Gumberidze, M; Heinz, T; Hennino, T; Holzmann, R; Ierusalimov, A; Iori, I; Ivashkin, A; Jurkovic, M; Kaempfer, B; Karavicheva, T; Koenig, I; Koenig, W; Kolb, B W; Kornakov, G; Kotte, R; Krasa, A; Krizek, F; Kruecken, R; Kuc, H; Kuehn, W; Kugler, A; Kurepin, A; Ladygin, V; Lalik, R; Lang, S; Lapidus, K; Lebedev, A; Liu, T; Lopes, L; Lorenz, M; Maier, L; Mangiarotti, A; Markert, J; Metag, V; Michalska, B; Michel, J; Muentz, C; Naumann, L; Pachmayer, Y C; Palka, M; Parpottas, Y; Pechenov, V; Pechenova, O; Petousis, V; Pietraszko, J; Przygoda, W; Ramstein, B; Reshetin, A; Rustamov, A; Sadovsky, A; Salabura, P; Scheib, T; Schuldes, H; Schmah, A; Schwab, E; Siebenson, J; Sobolev, Yu G; Spataro, S; Spruck, B; Stroebele, H; Stroth, J; Sturm, C; Tarantola, A; Teilab, K; Tlusty, P; Traxler, M; Trebacz, R; Tsertos, H; Vasiliev, T; Wagner, V; Weber, M; Wendisch, C; Wuestenfeld, J; Yurevich, S; Zanevsky, Y

2013-01-01T23:59:59.000Z

475

Optical microphone  

DOE Patents (OSTI)

An optical microphone includes a laser and beam splitter cooperating therewith for splitting a laser beam into a reference beam and a signal beam. A reflecting sensor receives the signal beam and reflects it in a plurality of reflections through sound pressure waves. A photodetector receives both the reference beam and reflected signal beam for heterodyning thereof to produce an acoustic signal for the sound waves. The sound waves vary the local refractive index in the path of the signal beam which experiences a Doppler frequency shift directly analogous with the sound waves.

Veligdan, James T. (Manorville, NY)

2000-01-11T23:59:59.000Z

476

Observation of quasiperiodic dynamics in a one-dimensional quantum walk of single photons in space  

E-Print Network (OSTI)

We realize quasi-periodic dynamics of a quantum walker over 2.5 quasi-periods by realizing the walker as a single photon passing through a quantum-walk optical-interferometer network. We introduce fully controllable polarization-independent phase shifters in each optical path to realize arbitrary site-dependent phase shifts, and we employ large clear-aperture beam displacers, while maintaining high-visibility interference, to enable reaching 10 quantum-walk steps. By varying the half-wave-plate setting, we control the quantum-coin bias thereby observing a transition from quasi-periodic dynamics to ballistic diffusion.

Peng Xue; Hao Qin; Bao Tang; Barry C. Sanders

2013-11-30T23:59:59.000Z

477

Near-infrared single-photons from aligned molecules in ultrathin crystalline films at room temperature  

E-Print Network (OSTI)

We investigate the optical properties of Dibenzoterrylene (DBT) molecules in a spin-coated crystalline film of anthracence. By performing single molecule studies, we show that the dipole moments of the DBT molecules are oriented parallel to the plane of the film. Despite a film thickness of only 20 nm, we observe an exceptional photostability at room temperature and photon count rates around one million per second from a single molecule. These properties together with an emission wavelength around 800 nm make this system attractive for applications in nanophotonics and quantum optics.

C. Toninelli; K. Early; J. Bremi; A. Renn; S. Goetzinger; V. Sandoghdar

2010-02-04T23:59:59.000Z

478

Grey photovoltaic solitons in two-photon photorefractive materials under the open-circuit  

Science Journals Connector (OSTI)

In steady-state conditions, we predicted that grey photovoltaic solitons of the optical wave evolution equation could exist in two-photon photorefractive materials under the open-circuit case. The characteristics of the grey photovoltaic soliton, such as the intensity profile, the intensity full width at half-maximum, the transverse velocity and the phase profiles of these grey photovoltaic solitons are discussed in detail.

Y Zhang; C F Hou; X D Sun

2008-01-01T23:59:59.000Z

479

Self-assembled photonic-plasmonic nanotweezers for directed self-assembly of hybrid nanostructures  

SciTech Connect

We demonstrate a technique for assembling photonic-plasmonic nanotweezers by optically driving the adsorption of multi-walled carbon nanotubes onto a silicon waveguide. The nanotweezers are then used to trap and release individual polystyrene beads. Additionally, we demonstrate the ability to localize the deposition of metallic nanoparticles to the intersection points between multiple carbon nanotubes with the goal of forming more complex hybrid nanostructures.

O'Dell, Dakota; Serey, Xavier [School of Applied and Engineering Physics, Cornell University, Ithaca, New York 14853 (United States); Erickson, David, E-mail: de54@cornell.edu [Sibley School of Mechanical and Aerospace Engineering, Cornell University, Ithaca, New York 14853 (United States)

2014-01-27T23:59:59.000Z

480

Probing the Heavy Quark Content of the Photon Using b Tagging at High Energy $e?$ and $e^+e^-$ Colliders  

E-Print Network (OSTI)

We suggest a method for probing the quark content of the photon using $b$ tagging at high energy $e^+e^-$ and $e\\gamma$ colliders. We find that heavy quark tagging provides a sensitive and effective probe of the quark content of the photon especially in the low $x$-region where the various models differ the most. This process is complementary to others that have been studied in the literature and can contribute to more precise determinations of quark and gluon distributions inside the photon.

Michael A. Doncheski; Stephen Godfrey; K. Andrew Peterson

1994-07-21T23:59:59.000Z

Note: This page contains sample records for the topic "regional optics photonics" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


481

Region 9: Pacific Rim Region, Regional Sustainability Plan  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

REGION 9: PACIFIC RIM REGION REGION 9: PACIFIC RIM REGION Regional Sustainability Plan Presented by Ruth Cox Region 9 Regional Administrator Federal Utility Partnership Working Group (FUPWG) May 22 nd , 2013 REGION 9 INFORMATION MANAGE Federal space  36 million RSF in Region Nine * 173 owned buildings, 955 leased buildings * 100,000 Federal workers housed DESIGN & CONSTRUCT new Federal buildings $1.4 billion in FY12 capital construction projects $318 million in FY13 - Los Angeles Courthouse project PROVIDE PROCUREMENT LEADERSHIP across the Federal government  $1.24 billion in total GSA Schedule sales in FY12  $468 million to small businesses  34,000 fleet vehicles, 53% of which are Alternative Fuel Vehicles Pacific Rim Profile - CA, AZ, NV, HI

482

Dark Photon Search at BABAR  

SciTech Connect

Presented is the current progress of a search for the signature of a dark photon or new particle using the BaBar data set. We search for the processes e{sup +}e{sup -} {yields} {gamma}{sub ISR}A{prime},A{prime} {yields} e{sup +}e{sup -} and e{sup +}e{sup -} {yields} {gamma}{sub ISR}{gamma}, {gamma} {yields} A{prime},A{prime} {yields} e{sup +}e{sup -}, where {gamma}{sub ISR} is an initial state radiated photon of energy E{sub {gamma}} >= 1 GeV. Twenty-five sets of Monte Carlo, simulating e{sup +}e{sup -} collisions at an energy of 10.58 GeV, were produced with different values of the A{prime} mass ranging from 100 MeV to 9.5 GeV. The mass resolution is calculated based on Monte Carlo simulations. We implement ROOT's Toolkit for Multivariate Analysis (TMVA), a machine learning tool that allows us to evaluate the signal character of events based on many of discriminating variables. TMVA training is conducted with samples of Monte Carlo as signal and a small portion of Run 6 as background. The multivariate analysis produces additional cuts to separate signal and background. The signal efficiency and sensitivity are calculated. The analysis will move forward to fit the background and scan the residuals for the narrow resonance peak of a new particle.

Greenwood, Ross N; /MIT /SLAC

2012-09-07T23:59:59.000Z

483

Photon and graviton mass limits  

SciTech Connect

We review past and current studies of possible long-distance, low-frequency deviations from Maxwell electrodynamics and Einstein gravity. Both have passed through three phases: (1) Testing the inverse-square laws of Newton and Coulomb, (2) Seeking a nonzero value for the rest mass of photon or graviton, and (3) Considering more degrees of freedom, allowing mass while preserving gauge or general-coordinate invariance. For electrodynamics there continues to be no sign of any deviation. Since our previous review the lower limit on the photon Compton wavelength (associated with weakening of electromagnetic fields in vacuum over large distance scale) has improved by four orders of magnitude, to about one astronomical unit. Rapid current progress in astronomical observations makes it likely that there will be further advances. These ultimately could yield a bound exceeding galactic dimensions, as has long been contemplated. Meanwhile, for gravity there have been strong arguments about even the concept of a graviton rest mass. At the same time there are striking observations, commonly labeled 'dark matter' and 'dark energy' that some argue imply modified gravity. This makes the questions for gravity much more interesting. For dark matter, which involves increased attraction at large distances, any explanation by modified gravity would be qualitatively different from graviton mass. Because dark energy is associated with reduced attraction at large distances, it might be explained by a graviton-mass-like effect.

Nieto, Michael [Los Alamos National Laboratory; Goldhaber Scharff, Alfred [SUNY

2008-01-01T23:59:59.000Z

484

Optical Spectroscopy  

Science Journals Connector (OSTI)

...near-infrared wavelengths, and either a deuterium lamp or a xenon arc lamp for the ultraviolet region. The detection systems...spectrum of the ruby variety of corundum produce periodic oscillations in the data. Woods grating anomaly At certain wavelengths...

George R. Rossman

485

Optical conductivity of curved graphene  

E-Print Network (OSTI)

We compute the optical conductivity for an out-of-plane deformation in graphene using an approach based on solutions of the Dirac equation in curved space. Different examples of periodic deformations along one direction translates into an enhancement of the optical conductivity peaks in the region of the far and mid infrared frequencies for periodicities $\\sim100\\,$nm. The width and position of the peaks can be changed by dialling the parameters of the deformation profiles. The enhancement of the optical conductivity is due to intraband transitions and the translational invariance breaking in the geometrically deformed background. Furthemore, we derive an analytical solution of the Dirac equation in a curved space for a general deformation along one spatial direction. For this class of geometries, it is shown that curvature induces an extra phase in the electron wave function, which can also be explored to produce interference devices of the Aharonov-Bohm type.

A. J. Chaves; T. Frederico; O. Oliveira; W. de Paula; M. C. Santos

2014-05-01T23:59:59.000Z

486

Photon and neutrino spectra of time-dependent photospheric models of gamma-ray bursts  

SciTech Connect

Thermal photons from the photosphere may be the primary source of the observed prompt emission of gamma-ray bursts (GRBs). In order to produce the observed non-thermal spectra, some kind of dissipation mechanism near the photosphere is required. In this paper we numerically simulate the evolution of the photon spectrum in a relativistically expanding shell with a time-dependent numerical code. We consider two basic models. One is a leptonic model, where a dissipation mechanism heats the thermal electrons maintaining their high temperature. The other model involves a cascade process induced by pp(pn)-collisions which produce high-energy electrons, modify the thermal spectrum, and emit neutrinos. The qualitative properties of the photon spectra are mainly determined by the optical depth at which the dissipation mechanism sets in. Too large optical depths lead to a broad and curved spectrum contradicting the observations, while for optical depths smaller than unity the spectral hardness becomes softer than observed. A significant shift of the spectral peak energy to higher energies due to a large energy injection can lead to an overly broad spectral shape. We show ideal parameter ranges for which these models are able to reproduce the observed spectra. For the pn-collision model, the neutrino fluence in the 10100 GeV range is well above the atmospheric neutrino fluence, but its detection is challenging for presently available detectors.

Asano, K. [Institute for Cosmic Ray Research, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8582 (Japan); Mszros, P., E-mail: asanok@icrr.u-tokyo.ac.jp, E-mail: nnp@astro.psu.edu [Department of Astronomy and Astrophysics, Department of Physics, Center for Particle and Gravitational Astrophysics, Pennsylvania State University, University Park, PA 16802 (United States)

2013-09-01T23:59:59.000Z

487

Assembly of quasicrystalline photonic heterostructures  

DOE Patents (OSTI)

A method and system for assembling a quasicrystalline heterostructure. A plurality of particles is provided with desirable predetermined character. The particles are suspended in a medium, and holographic optical traps are used to position the particles in a way to achieve an arrangement which provides a desired property.

Grier, David G.; Roichman, Yael; Man, Weining; Chaikin, Paul Michael; Steinhardt, Paul Joseph

2013-03-12T23:59:59.000Z

488

Quantum optical technologies for metrology, sensing and imaging  

E-Print Network (OSTI)

Over the past 20 years, bright sources of entangled photons have led to a renaissance in quantum optical interferometry. Optical interferometry has been used to test the foundations of quantum mechanics and implement some of the novel ideas associated with quantum entanglement such as quantum teleportation, quantum cryptography, quantum lithography, quantum computing logic gates, and quantum metrology. In this paper, we focus on the new ways that have been developed to exploit quantum optical entanglement in quantum metrology to beat the shot-noise limit, which can be used, e.g., in fiber optical gyroscopes and in sensors for biological or chemical targets. We also discuss how this entanglement can be used to beat the Rayleigh diffraction limit in imaging systems such as in LIDAR and optical lithography.

Jonathan P. Dowling; Kaushik P. Seshadreesan

2014-12-24T23:59:59.000Z

489

State & Regional Resources  

Energy.gov (U.S. Department of Energy (DOE))

The Bioenergy Technologies Office partners with the National Biomass State and Regional Partnerships' five regional organizations that provide leadership in their regions with regard to policies...

490

Optical Third-Harmonic Generation in Graphene  

We report strong third-harmonic generation in monolayer graphene grown by chemical vapor deposition and transferred to an amorphous silica (glass) substrate; the photon energy is in three-photon resonance with the exciton-shifted van Hove singularity at the M point of graphene. The polarization selection rules are derived and experimentally verified. In addition, our polarization- and azimuthal-rotation-dependent third-harmonic-generation measurements reveal in-plane isotropy as well as anisotropy between the in-plane and out-of-plane nonlinear optical responses of graphene. Since the third-harmonic signal exceeds that from bulk glass by more than 2 orders of magnitude, the signal contrast permits background-free scanning of graphene and provides insight into the structural properties of graphene.

Hong, Sung-Young; Dadap, Jerry I.; Petrone, Nicholas; Yeh, Po-Chun; Hone, James; Osgood, Richard M.

2013-06-01T23:59:59.000Z

491

Photon-number-resolved heralded-photon source for improved quantum key distribution  

SciTech Connect

We have suppressed multiphoton probability of a heralded-photon source, which is vital for quantum key distribution with a higher secure key generation rate. It is accomplished by utilizing a practical photon-number-resolving detector for triggering resulting in an important step for improved practical quantum key distribution. Heralded-photon source and a practical photon-number-resolving detector capable of real-time processed multiphoton rejection are stably operable at room temperature and enable us to generate a secure key at a distance as long as an ideal single photon source is used.

Horikiri, Tomoyuki [Department of Physics, Graduate School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033 (Japan); Institute of Laser Science and Department of Applied Physics and Chemistry, University of Telecommunications, Chofu-ga-oka 1-5-1, Chofu, Tokyo 182-8585 (Japan); Takeno, Yuishi [Department of Physics, Graduate School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033 (Japan); Yabushita, Atsushi [Department of Electrophysics, Faculty of Science, National Chiao Tung University, 1001 Ta Hsueh Road, Hsinchu, Taiwan 300 (China); Kobayashi, Takayoshi [ICORP, JST, 4-1-8 Honcho, Kawaguchi, Saitama (Japan); Institute of Laser Science and Department of Applied Physics and Chemistry, University of Telecommunications, Chofu-ga-oka 1-5-1, Chofu, Tokyo 182-8585 (Japan); Department of Electrophysics, Faculty of Science, National Chiao Tung University, 1001 Ta Hsueh Road, Hsinchu, Taiwan 300 (China); Institute of Laser Engineering, Osaka University, Yamadagaoka 2-6, Suita, Osaka 565-0871 (Japan)

2007-07-15T23:59:59.000Z

492

Law of Malus and Photon-Photon Correlations: A Quasi-Deterministic Analyzer Model  

E-Print Network (OSTI)

For polarization experiments involving photon counting we introduce a quasi-deterministic eigenstate transition model of the analyzer process. Distributions accumulated one photon at a time, provide a deterministic explanation for the law of Malus. We combine this analyzer model with causal polarization coupling to calculate photon-photon correlations, one photon pair at a time. The calculated correlations exceed the Bell limits and show excellent agreement with the measured correlations of [ A. Aspect, P. Grangier and G. Rogers, Phys. Rev. Lett. 49 91 (1982)]. We discuss why this model exceeds the Bell type limits.

Bill Dalton

2001-01-27T23:59:59.000Z

493

Regional Summary Pacific Region Management Context  

E-Print Network (OSTI)

, for the Eastern Pacific Ocean, and the Western and Central Pacific Fishery Commission, for the Western PacificRegional Summary Pacific Region Management Context The Pacific Region includes California, Oregon, and Washington. Federal fisheries in this region are managed by the Pacific Fishery Management Council (PFMC

494

CP violation in neutrinophoton scattering  

Science Journals Connector (OSTI)

It is shown that effects of CP violation arise in neutrinophoton scattering. Several CP-violating ?? reactions are considered within the Standard Model and predictions for some observables are made. It is emphasized that neutrinophoton scattering may provide an experimental tool for testing the scale dependence of CP violation.

I Alikhanov

2014-01-01T23:59:59.000Z

495

Status and perspectives of gaseous photon detectors  

Science Journals Connector (OSTI)

Abstract This article aims at reviewing the state of the art of gaseous photon detectors for RICH applications. Emphasis will be put on THGEM based devices which represent the most advanced development among the various micro-pattern gaseous photon sensors proposed for Cherenkov imaging in very high rate environments.

Antonio Di Mauro

2014-01-01T23:59:59.000Z

496

Modified Photon Propagator in the -Dominance Model  

Science Journals Connector (OSTI)

......by the insertion of a single p0 propa- gator, second graph of Fig. 1, and the first...term" inserted between photon propa- gators. Using the vector meson propagator given...peating this insertion process of p0 propa- gators and "photon mass terms" to con- struct......

R. A. Buchl; B. P. Nigam

1970-09-01T23:59:59.000Z

497

Wave propagation in photonic crystals and metamaterials: Surface waves, nonlinearity and chirality  

SciTech Connect

Photonic crystals and metamaterials, both composed of artificial structures, are two interesting areas in electromagnetism and optics. New phenomena in photonic crystals and metamaterials are being discovered, including some not found in natural materials. This thesis presents my research work in the two areas. Photonic crystals are periodically arranged artificial structures, mostly made from dielectric materials, with period on the same order of the wavelength of the working electromagnetic wave. The wave propagation in photonic crystals is determined by the Bragg scattering of the periodic structure. Photonic band-gaps can be present for a properly designed photonic crystal. Electromagnetic waves with frequency within the range of the band-gap are suppressed from propagating in the photonic crystal. With surface defects, a photonic crystal could support surface modes that are localized on the surface of the crystal, with mode frequencies within the band-gap. With line defects, a photonic crystal could allow the propagation of electromagnetic waves along the channels. The study of surface modes and waveguiding properties of a 2D photonic crystal will be presented in Chapter 1. Metamaterials are generally composed of artificial structures with sizes one order smaller than the wavelength and can be approximated as effective media. Effective macroscopic parameters such as electric permittivity {epsilon}, magnetic permeability {mu} are used to characterize the wave propagation in metamaterials. The fundamental structures of the metamaterials affect strongly their macroscopic properties. By designing the fundamental structures of the metamaterials, the effective parameters can be tuned and different electromagnetic properties can be achieved. One important aspect of metamaterial research is to get artificial magnetism. Metallic split-ring resonators (SRRs) and variants are widely used to build magnetic metamaterials with effective {mu} < 1 or even {mu} < 0. Varactor based nonlinear SRRs are built and modeled to study the nonlinearity in magnetic metamaterials and the results will be presented in Chapter 3. Negative refractive index n is one of the major target in the research of metamaterials. Negative n can be obtained with a metamaterial with both {epsilon} and {mu} negative. As an alternative, negative index for one of the circularly polarized waves could be achieved with metamaterials having a strong chirality ?. In this case neither {epsilon} nor {mu} negative is required. My work on chiral metamaterials will be presented in Chapter 4.

Wang, Bingnan

2009-12-03T23:59:59.000Z

498

Size dependent nonlinear optical properties of YCrO{sub 3} nanosystems  

SciTech Connect

We report size-dependent optical limiting response of YCrO{sub 3} nanosystems upon illumination by nanosecond laser pulses at 532 nm. The limiting properties were investigated using the open aperture z-scan technique. Three-photon absorption coefficient is found to increase with particle size within the range of our investigations. We propose that the obtained nonlinearity is caused by two photon absorption, followed by excited state absorption.

Krishnan, Shiji, E-mail: shijikrish@gmail.com [School of Pure and Applied Physics, Mahatma Gandhi University, Kottayam-686 560, Kerala (India); Shafakath, K.; Philip, Reji [Light and Matter Physics Group, Raman Research Institute, Bangalore- 560 080, Karnataka (India); Kalarikkal, Nandakumar, E-mail: nkkalarikkal@mgu.ac.in [School of Pure and Applied Physics, Mahatma Gandhi University, Kottayam-686 560, Kerala and Center for Nanoscience and Nanotechnology, Mahatma Gandhi University, Kottayam-686 560, Kerala (India)

2014-01-28T23:59:59.000Z

499

Optical data latch  

DOE Patents (OSTI)

An optical data latch is formed on a substrate from a pair of optical logic gates in a cross-coupled arrangement in which optical waveguides are used to couple an output of each gate to an photodetector input of the other gate. This provides an optical bi-stability which can be used to store a bit of optical information in the latch. Each optical logic gate, which can be an optical NOT gate (i.e. an optical inverter) or an optical NOR gate, includes a waveguide photodetector electrically connected in series with a waveguide electroabsorption modulator. The optical data latch can be formed on a III-V compound semiconductor substrate (e.g. an InP or GaAs substrate) from III-V compound semiconductor layers. A number of optical data latches can be cascaded to form a clocked optical data shift register.

Vawter, G. Allen (Corrales, NM)

2010-08-31T23:59:59.000Z

500

U2B Beamline | Photon Sciences | Brookhaven National Laboratory  

NLE Websites -- All DOE Office Websites (Extended Search)

BNL People BNL People Photon SciencesInfrared Programs PS Home Infrared Home Beamlines U2A U2B U4IR U10A U10B U12IR Publications User Info Useful Sites Beamline U2B Home Publications Equipment Schedule Beamtime Instrument Spectrometer endstation: Thermo Nicolet Magna 860 Step-Scan FTIR and Continuum IR microscope Frequency Range (cm-1): 500 - 4000 Spectral resolution (cm-1): 4.0 Spatial resolution: diffraction-limit (i.e. ~ 3 to 10 microns) Brightness (compared to a black body): 100x to 1000x Smallest practical targeting aperture size: 3 microns square Beamline angular acceptance: (milliradians): 40H x 40V (100% vertical collection down to 240 cm-1) Optical Configuration A two-mirror system (M1 and M2) collects and re-images the synchrotron infrared source at a point just outside of the storage ring's UHV. M1 is a