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Note: This page contains sample records for the topic "nonlinear waveguides view" 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.


1

Waveguide engineering of graphene's nonlinearity  

E-Print Network [OSTI]

Graphene has recently been shown to possess giant nonlinearity; however, the utility of this nonlinearity is limited due to high losses and small interaction volume. We show that by performing waveguide engineering to graphene's nonlinearity, we are able to dramatically increase the nonlinear parameter and decrease the switching optical power to sub-watt levels. Our design makes use of the hybrid plasmonic waveguide and careful manipulation of graphene's refractive index by tuning its Fermi level. The ability to tailor the nonlinear parameter in graphene based waveguides via the Fermi level provides a paradigm of nonlinear optics devices to be realized.

Ooi, Kelvin J A; Tan, Dawn T H

2014-01-01T23:59:59.000Z

2

Graphene sustained nonlinear modes in dielectric waveguides  

Science Journals Connector (OSTI)

We discuss the existence of nonlinear modes sustained by graphene layers in dielectric waveguides. Taking advantage of the almost two dimensional nature of graphene, we introduce the...

Auditore, Aldo; De Angelis, Costantino; Locatelli, Andrea; Boscolo, Stefano; Midrio, Michele; Romagnoli, Marco; Capobianco, Antonio-Daniele; Nalesso, Gianfranco

2013-01-01T23:59:59.000Z

3

Dynamic Time Expansion and Compression Using Nonlinear Waveguides  

DOE Patents [OSTI]

Dynamic time expansion or compression of a small amplitude input signal generated with an initial scale is performed using a nonlinear waveguide. A nonlinear waveguide having a variable refractive index is connected to a bias voltage source having a bias signal amplitude that is large relative to the input signal to vary the reflective index and concomitant speed of propagation of the nonlinear waveguide and an electrical circuit for applying the small amplitude signal and the large amplitude bias signal simultaneously to the nonlinear waveguide. The large amplitude bias signal with the input signal alters the speed of propagation of the small-amplitude signal with time in the nonlinear waveguide to expand or contract the initial time scale of the small-amplitude input signal.

Findikoglu, Alp T.; Hahn, Sangkoo F.; Jia, Quanxi

2004-06-22T23:59:59.000Z

4

Relative electrical resistivities and poling of nonlinear optical polymeric waveguides  

E-Print Network [OSTI]

Relative electrical resistivities and poling of nonlinear optical polymeric waveguides Toma to determine the relative dc electrical resistivities of a series of linear and nonlinear optical polymers. The method can be used to identify low resistivity linear cladding materials for optimized electric field

Paris-Sud XI, Université de

5

Web-interfaced Nonlinear Optical Waveguide and Photonic Crystal Simulator  

SciTech Connect (OSTI)

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

6

Efficient supercontinuum generation in quadratic nonlinear waveguides without quasi-phase matching  

E-Print Network [OSTI]

Efficient supercontinuum generation (SCG) requires excitation of solitons at the pump laser wavelength. Quadratic nonlinear waveguides may support an effective self-defocusing nonlinearity so solitons can directly be generated at common ultrafast laser wavelengths without any waveguide dispersion engineering. We here experimentally demonstrate efficient SCG in a standard lithium niobate (LN) waveguide without using quasi-phase matching (QPM). By using femtosecond pumps with wavelengths in the $1.25-1.5 \\mu\\rm m$ range, where LN has normal dispersion and thus supports self-defocusing solitons, octave-spanning SCG is observed. An optimized mid-IR waveguide design is expected to support even broader spectra. The QPM-free design reduces production complexity, allows longer waveguides, limits undesired spectral resonances and effectively allows using nonlinear crystals where QPM is inefficient or impossible. This result is important for mid-IR SCG, where QPM-free self-defocusing waveguides in common mid-IR nonline...

Guo, Hairun; Steinert, Michael; Setzpfandt, Frank; Pertsch, Thomas; Chung, Hung-ping; Chen, Yen-Hung; Bache, Morten

2014-01-01T23:59:59.000Z

7

Phase matching using Bragg reflection waveguides for monolithic nonlinear optics  

E-Print Network [OSTI]

-2945 (1998). 4. A. S. Helmy, D. C. Hutchings, T. C. Kleckner, J. H. Marsh, A. C. Bryce, J. M. Arnold, C. R, 1370-1373 (2000). 5. R. Haidar, N. Forget, E. Rosencher, "Optical parametric oscillation in micro. Helmy, Brian R. West "Phase Matching using Bragg Reflector Waveguides," IEEE LEOS Annual Meeting, Sydney

8

Dynamical analysis of a weakly coupled nonlinear dielectric waveguide: Surface-plasmon model as another type of Josephson junction  

SciTech Connect (OSTI)

We propose that a weakly coupled nonlinear dielectric waveguide surface-plasmon system can be formulated as another type of Josephson junction. Such a system can be realized along a metal-dielectric interface where the dielectric medium hosts a nonlinear waveguide (e.g., fiber) for soliton propagation. We demonstrate that the system is in close analogy to the bosonic Josephson junction of atomic condensates at very low temperatures, yet exhibits different dynamical features. In particular, the inherently dynamic coupling parameter between soliton and surface plasmon generates self-trapped oscillatory states at nonzero fractional populations with zero and {pi} time-averaged phase difference. The salient features of the dynamics are presented in the phase space.

Eksioglu, Yasa; Muestecaplioglu, Oezguer E.; Gueven, Kaan [Department of Physics, Koc University, Istanbul (Turkey)

2011-09-15T23:59:59.000Z

9

Dynamical analysis of a weakly coupled nonlinear dielectric waveguide -- surface-plasmon model as a new type of Josephson Junction  

E-Print Network [OSTI]

We propose that a weakly-coupled nonlinear dielectric waveguide -- surface-plasmon system can be formulated as a new type of Josephson junction. Such a system can be realized along a metal - dielectric interface where the dielectric medium hosts a nonlinear waveguide (e.g. fiber) for soliton propagation. We demonstrate that the system is in close analogy to the bosonic Josephson-Junction (BJJ) of atomic condensates at very low temperatures, yet exhibits different dynamical features. In particular, the inherently dynamic coupling parameter between soliton and surface-plasmon generates self-trapped oscillatory states at nonzero fractional populations with zero and $\\pi$ time averaged phase difference. The salient features of the dynamics are presented in the phase space.

Ek?io?lu, Yasa; Güven, Kaan

2011-01-01T23:59:59.000Z

10

Characterization of third order nonlinearities in TiO? waveguides at 1550 nm  

E-Print Network [OSTI]

Polycrystalline anatase titanium dioxide waveguides are investigated as an alternative material for all-optical switching at telecommunications C-band wavelengths. Titanium dioxide does not support two-photon absorption ...

Shtyrkova, Katia

2013-01-01T23:59:59.000Z

11

Nonlinear optical waveguides based on near-infrared intersubband transitions in GaN/AlN  

E-Print Network [OSTI]

. Hasama, "Subpicosecond saturation of intersubband absorption in (CdS/ZnSe)/BeTe quantum well waveguides. Cho, "Intersubband absorption at ~ 1.55 m in well- and modulation-doped GaN/AlGaN multiple quantum

12

Vol. 6, No. 4/April 1989/J. Opt. Soc. Am. B 67& Optical nonlinearities in CdSSejr-doped glass waveguides  

E-Print Network [OSTI]

semiconductor crystallites, typi- cally the mixed semiconductor CdS.Selx, that strongly in- fluence the opticalVol. 6, No. 4/April 1989/J. Opt. Soc. Am. B 67& Optical nonlinearities in CdSSejr-doped glass-optical properties of CdSxSel- doped glasschannel waveguides. The technique isused in situ and may be used

13

Collisions between discrete surface spatiotemporal solitons in nonlinear waveguide arrays Dumitru Mihalache and Dumitru Mazilu  

E-Print Network [OSTI]

-HH), 407 Atomistilor, Magurele-Bucharest 077125, Romania Falk Lederer Institute of Condensed Matter Theory of nonlinear optical surface waves has been renewed recently, and a series of theoretical predictions 9

14

Nonlinear propagation of ultrafast 1.5 m pulses in high-index-contrast silicon-on-insulator waveguides  

E-Print Network [OSTI]

laser pulses with peak powers up to 400 W is studied experimentally and theoretically. The dominant-refractive-index-contrast HRIC optical waveguides consisting of silicon cores surrounded by air and/or oxide cladding regions can influencing the propagation of short laser pulses inside silicon waveguides. These effects have been studied

Sipe,J. E.

15

Ultrafast laser inscription of bistable and reversible waveguides in strontium barium niobate crystals  

E-Print Network [OSTI]

Ultrafast laser inscription of bistable and reversible waveguides in strontium barium niobate optical channel waveguides in strontium barium niobate nonlinear ferroelectric crystals by direct for the fabrication of optical buried waveguides. This would be especially relevant in the ferroelectric strontium

16

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

17

Guided wave methods and apparatus for nonlinear frequency generation  

DOE Patents [OSTI]

Methods and apparatus are disclosed for the nonlinear generation of sum and difference frequencies of electromagnetic radiation propagating in a nonlinear material. A waveguide having a waveguide cavity contains the nonlinear material. Phase matching of the nonlinear generation is obtained by adjusting a waveguide propagation constant, the refractive index of the nonlinear material, or the waveguide mode in which the radiation propagates. Phase matching can be achieved even in isotropic nonlinear materials. A short-wavelength radiation source uses phase-matched nonlinear generation in a waveguide to produce high harmonics of a pulsed laser.

Durfee, III, Charles G. (Ann Arbor, MI); Rundquist, Andrew (Austin, TX); Kapteyn, Henry C. (Ann Arbor, MI); Murnane, Margaret M. (Ann Arbor, MI)

2000-01-01T23:59:59.000Z

18

Spectral broadening in femtosecond laser written waveguides in chalcogenide glass  

Science Journals Connector (OSTI)

Nonlinear spectral broadening to 200 nm, from an initial width of 50 nm, has been demonstrated in gallium lanthanum sulphide glass waveguides from 1540 nm, 200 fs pulses at 30...

Hughes, Mark A; Yang, Weijia; Hewak, Daniel W

2009-01-01T23:59:59.000Z

19

Graphene antidot lattice waveguides  

Science Journals Connector (OSTI)

We introduce graphene antidot lattice waveguides: nanostructured graphene where a region of pristine graphene is sandwiched between regions of graphene antidot lattices. The band gaps in the surrounding antidot lattices enable localized states to emerge in the central waveguide region. We model the waveguides via a position-dependent mass term in the Dirac approximation of graphene and arrive at analytical results for the dispersion relation and spinor eigenstates of the localized waveguide modes. To include atomistic details we also use a tight-binding model, which is in excellent agreement with the analytical results. The waveguides resemble graphene nanoribbons, but without the particular properties of ribbons that emerge due to the details of the edge. We show that electrons can be guided through kinks without additional resistance and that transport through the waveguides is robust against structural disorder.

Jesper Goor Pedersen; Tue Gunst; Troels Markussen; Thomas Garm Pedersen

2012-12-11T23:59:59.000Z

20

Optical Waveguide Enhanced Photovoltaics  

Science Journals Connector (OSTI)

Enhanced light to electric power conversion efficiency of photovoltaic cells ?with a low absorbance was achieved using waveguide integration. We ?present a proof of concept using a...

Rühle, Sven; Greenwald, Shlomit; Koren, Elad; Zaban, Arie

2008-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "nonlinear waveguides view" 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

Energy Transport by Nonlinear Internal Waves  

Science Journals Connector (OSTI)

Winter stratification on Oregon’s continental shelf often produces a near-bottom layer of dense fluid that acts as an internal waveguide upon which nonlinear internal waves propagate. Shipboard profiling and bottom lander observations capture ...

J. N. Moum; J. M. Klymak; J. D. Nash; A. Perlin; W. D. Smyth

2007-07-01T23:59:59.000Z

22

Surface modification to waveguides  

DOE Patents [OSTI]

A method of treating the interior surfaces of a waveguide to improve power transmission comprising the steps of mechanically polishing to remove surface protrusions; electropolishing to remove embedded particles; ultrasonically cleaning to remove any residue; coating the interior waveguide surfaces with an alkyd resin solution or electrophoretically depositing carbon lamp black suspended in an alkyd resin solution to form a 1.mu. to 5.mu. thick film; vacuum pyrolyzing the film to form a uniform adherent carbon coating.

Timberlake, John R. (Allentown, NJ); Ruzic, David N. (Kendall Park, NJ); Moore, Richard L. (Princeton, NJ); Cohen, Samuel A. (Pennington, NJ); Manos, Dennis M. (Lawrenceville, NJ)

1983-01-01T23:59:59.000Z

23

Influence of ponderomotive force on the microwave and plasma interaction in an elliptical waveguide  

SciTech Connect (OSTI)

The interaction effect of a high-power microwave with the plasma in an elliptical waveguide taking into account the ponderomotive force is presented. Here, we assume the fundamental mode that propagates in an evacuated elliptical waveguide and encounters a plasma, which is filled in another elliptical waveguide of the same size. Here, we consider a balance between the effects of ponderomotive force and the electron pressure and consider the plasma effect through its dielectric permittivity because the electron density distribution of the plasma is modified. The propagation of the mode is described by two nonlinear coupled differential equations obtained using the Maxwell's equations. These equations are solved numerically using fourth order Runge-Kutta method for the field amplitude of the microwave in the waveguide considering the waveguide to be made up of a perfect conductor and filled with homogeneous plasma density distribution. The effects of the electron temperature, the microwave filed, and the frequency on the perturbed density profile are studied.

Abdoli-Arani, A., E-mail: abdoliabbas@kashanu.ac.ir [Department of Photonics, Faculty of Physics, University of Kashan, Kashan, Islamic Republic of Iran (Iran, Islamic Republic of)

2014-02-15T23:59:59.000Z

24

Active coupling control in densely packed subwavelength waveguides via dark mode  

E-Print Network [OSTI]

The ever growing need for energy-efficient and fast communications is driving the development of highly integrated photonic circuits where controlling light at the nanoscale becomes the most critical aspect of information transfer . Directional couplers, two interacting optical waveguides placed in close proximity, are important building blocks in these integrated photonics circuits and have been employed as optical modulators and switches for high speed communication, data processing and integrated quantum operations. However, active control over the coupling between closely packed waveguides is highly desirable and yet remains a critical barrier towards ultra small footprint devices. A general approach to achieve active control in waveguide systems is to exploit optical nonlinearities enabled by a strong control pulse. However these devices suffer from the nonlinear absorption induced by the intense control pulse as the signal and its control propagate in the same waveguide. Here we experimentally demonstra...

Suchowski, Haim; Hatakeyama, Taiki; Wu, Chihhui; Feng, Liang; OBrien, Kevin; Wang, Yuan; Zhang, Xiang

2015-01-01T23:59:59.000Z

25

Ultrafast nonlinear optical properties of passive and active semiconductor devices  

E-Print Network [OSTI]

Nonlinear optical properties and ultrafast carrier dynamics of slab-coupled optical waveguide amplifiers, silicon nanowaveguides, and III-V semiconductor saturable Bragg reflectors are studied. The limits imposed by two ...

Motamedi, Ali Reza

2011-01-01T23:59:59.000Z

26

Magnetically induced waveguide in graphene  

Science Journals Connector (OSTI)

We show that the magnetically induced waveguide in graphene leads to strong confinement of Dirac fermions, regardless of its edge terminations. The proposed waveguide indeed acts as a ballistic conductor and produces well-localized current density and stepwise increasing conductance. Furthermore, when the waveguide is modulated by a magnetic barrier in a small region, its transport properties are dramatically changed. The conductance now exhibits characteristic oscillatory increases as a function of fermion energy. The results of the modified waveguide may provide the applications of graphene-based transport devices.

Nojoon Myoung; G. Ihm; S. J. Lee

2011-03-28T23:59:59.000Z

27

Nano dispersion amplified waveguide structures  

Science Journals Connector (OSTI)

A highly dispersive waveguide structure is proposed tocefficiently compress and expand ultra short pulses in a package forming a sufficiently small footprint. A sub-wavelength...

Brown, J; Johnson, Eric; Moharam, M

2004-01-01T23:59:59.000Z

28

Folded waveguide coupler  

DOE Patents [OSTI]

A resonant cavity waveguide coupler for ICRH of a magnetically confined plasma. The coupler consists of a series of inter-leaved metallic vanes disposed withn an enclosure analogous to a very wide, simple rectangular waveguide that has been "folded" several times. At the mouth of the coupler, a polarizing plate is provided which has coupling apertures aligned with selected folds of the waveguide through which rf waves are launched with magnetic fields of the waves aligned in parallel with the magnetic fields confining the plasma being heated to provide coupling to the fast magnetosonic wave within the plasma in the frequency usage of from about 50-200 mHz. A shorting plate terminates the back of the cavity at a distance approximately equal to one-half the guide wavelength from the mouth of the coupler to ensure that the electric field of the waves launched through the polarizing plate apertures are small while the magnetic field is near a maximum. Power is fed into the coupler folded cavity by means of an input coaxial line feed arrangement at a point which provides an impedance match between the cavity and the coaxial input line.

Owens, Thomas L. (Kingston, TN)

1988-03-01T23:59:59.000Z

29

Proposed solar energy conversion and storage system using a nano-ring in an array waveguide  

Science Journals Connector (OSTI)

We propose the new solar energy conversion and storage system using the array waveguide. It can be used to generate and store solar energy within the nano-array waveguide system. The system consists of micro- and nano-ring resonators incorporating a Mach Zhender Interferometer (MZI) that can be integrated into a single system. The large bandwidth signal, i.e. white light, is generated using a soliton pulse in a Kerr-type nonlinear medium propagating within a micro-ring resonator system. The control light concept is applied using a nano-waveguide incorporating an MZI, whereas the incoherent light is filtered being coherence, which is amplified and stored within the system. The white light can be re-generated using the stored coherent light pulse. Furthermore, the combination of signals is formed by the array waveguide, which is allowed to generate the huge amount of solar energy output.

W. Khunnam; P.P. Yupapin

2010-01-01T23:59:59.000Z

30

Broadband, stable and highly coherent supercontinuum generation at telecommunication wavelengths in an hydrogenated amorphous silicon waveguide  

E-Print Network [OSTI]

Hydrogenated amorphous silicon (a:Si-H) has recently been recognized as a highly nonlinear CMOS compatible photonic platform. We experimentally demonstrate the generation of a supercontinuum (SC) spanning over 500 nm in a-Si:H photonic wire waveguide at telecommunication wavelengths using femtosecond input pulse with energy lower than 5 pJ. Numerical modeling of pulse propagation in the waveguide, based on the experimentally characterized dispersion profile, shows that the supercontinuum is the result of soliton fission and dispersive wave generation. It is demonstrated that the SC is highly coherent and that the waveguides do not suffer from material degradation under femtosecond pulse illumination. Finally, a direct comparison of SC generation in c-Si and a-Si:H waveguides confirms the higher performances of a-Si:H over c-Si for broadband low power SC generation at telecommunication wavelengths.

Leo, F; Kuyken, B; Roelkens, G; Gorza, S -P

2014-01-01T23:59:59.000Z

31

Waveguides for performing enzymatic reactions  

DOE Patents [OSTI]

The present invention is directed to a method and an apparatus for analysis of an analyte. The method involves providing a zero-mode waveguide which includes a cladding surrounding a core where the cladding is configured to preclude propagation of electromagnetic energy of a frequency less than a cutoff frequency longitudinally through the core of the zero-mode waveguide. The analyte is positioned in the core of the zero-mode waveguide and is then subjected, in the core of the zero-mode wave guide, to activating electromagnetic radiation of a frequency less than the cut-off frequency under conditions effective to permit analysis of the analyte in an effective observation volume which is more compact than if the analysis were carried out in the absence of the zero-mode waveguide.

Levene; Michael J. (Ithaca, NY), Korlach; Jonas (Ithaca, NY), Turner; Stephen W. (Ithaca, NY), Craighead; Harold G. (Ithaca, NY), Webb; Watt W. (Ithaca, NY)

2007-11-06T23:59:59.000Z

32

Diamond nanobeam waveguide optomechanics  

E-Print Network [OSTI]

Optomechanical devices sensitively transduce and actuate motion of nanomechanical structures using light, and are central to many recent fundamental studies and technological advances. Single--crystal diamond promises to improve the performance of optomechanical devices, while also providing opportunities to interface nanomechanics with diamond color center spins and related quantum technologies. Here we demonstrate measurement of diamond nanobeam resonators with a sensitivity of 9.5 fm/Hz^0.5 and bandwidth >120 nm through dissipative waveguide--optomechanical coupling. Nanobeams are fabricated from bulk single--crystal diamond using a scalable quasi--isotropic oxygen plasma undercut etching process, and support mechanical resonances with quality factor of 2.5 x 10^5 at room temperature, and 7.2 x 10^5 in cryogenic conditions (5K). Mechanical self--oscillations, resulting from interplay between optomechanical coupling and the photothermal response of nanobeams in a buckled state, are observed with amplitude e...

Khanaliloo, Behzad; Hryciw, Aaron C; Lake, David P; Kaviani, Hamidreza; Barclay, Paul E

2015-01-01T23:59:59.000Z

33

492 J. Opt. Soc. Am. B/Vol. 5,No. 2/February 1988 Nonlinear-optical effects in ion-exchanged  

E-Print Network [OSTI]

nonlinearity together with a fast response time.'-7 SDG consists of nano- crystallites of CdS-exchanged semiconductor-doped glass waveguides C. N. Ironside, T. J.Cullen, B.S. Bhumbra, and J.Bell Department-exchanged channel waveguides fabricated in semiconductor- doped glass. The nonlinearity is manifested as optically

34

Manufacturing of Er:ZBLAN ridge waveguides by pulsed laser deposition and ultrafast laser micromachining for green integrated lasers  

Science Journals Connector (OSTI)

Laser radiation is used both for the deposition of the laser active thin films and for the microstructuring to define wave guiding structures for the fabrication of waveguide lasers. Thin films of Er:ZBLAN (a fluoride glass consisting of ZrF4, BaF2, LaF3, AlF3, NaF, ErF3) for green up-conversion lasers (545 nm) are produced by pulsed laser deposition using ArF excimer laser radiation (wavelength 193 nm). Manufacturing of the laser active waveguides by microstructuring is done using fs-laser ablation of the deposited films. The structural and optical properties of the films and the damping losses of the structured waveguides are determined in view of the design and the fabrication of compact and efficient diode pumped waveguide lasers. The resulting waveguides are polished, provided with resonator mirrors, pumped using diode lasers and characterized.

Jens Gottmann; Leonid Moiseev; Ion Vasilief; Dirk Wortmann

2008-01-01T23:59:59.000Z

35

Controllable discrete diffraction in cascade-induced waveguides  

SciTech Connect (OSTI)

A new method for generating periodic lattices in quadratically nonlinear media by the three-wave cascade interaction is proposed. This method allows one to obtain stable structures with changeable parameters. These structures make it possible to realise the all-optical control of the character of the laser beam propagation. The use of the discrete diffraction allows the signal multiplexing in optical processing and information transfer devices and the control of the number of channels at the crystal output. The effect of the discrete diffraction anisotropy in the system of induced waveguides makes it possible to redistribute in the specified way the energy in the channels at the output. It is shown that the optical switching efficiency is maximal in the regime of the transverse Bragg resonance. The signal switching rate in optical lattices induced in a quadratically nonlinear medium is limited by the time of light propagation though the crystal and can achieve several terahertz. (nonlinear optical phenomena)

Borovkova, O V; Lobanov, V E; Sukhorukov, Anatolii P [M. V. Lomonosov Moscow State University, Faculty of Physics, Moscow (Russian Federation); Sukhorukova, A K [Russian State Geological Prospecting University, Moscow (Russian Federation)

2009-11-30T23:59:59.000Z

36

Integration of a waveguide self-electrooptic effect device and a vertically coupled interconnect waveguide  

DOE Patents [OSTI]

A self-electrooptic effect device ("SEED") is integrated with waveguide interconnects through the use of vertical directional couplers. Light initially propagating in the interconnect waveguide is vertically coupled to the active waveguide layer of the SEED and, if the SEED is in the transparent state, the light is coupled back to the interconnect waveguide.

Vawter, G. Allen (Corrales, NM)

2008-02-26T23:59:59.000Z

37

Optical panel system including stackable waveguides  

DOE Patents [OSTI]

An optical panel system including stackable waveguides is provided. The optical panel system displays a projected light image and comprises a plurality of planar optical waveguides in a stacked state. The optical panel system further comprises a support system that aligns and supports the waveguides in the stacked state. In one embodiment, the support system comprises at least one rod, wherein each waveguide contains at least one hole, and wherein each rod is positioned through a corresponding hole in each waveguide. In another embodiment, the support system comprises at least two opposing edge structures having the waveguides positioned therebetween, wherein each opposing edge structure contains a mating surface, wherein opposite edges of each waveguide contain mating surfaces which are complementary to the mating surfaces of the opposing edge structures, and wherein each mating surface of the opposing edge structures engages a corresponding complementary mating surface of the opposite edges of each waveguide.

DeSanto, Leonard (Dunkirk, MD); Veligdan, James T. (Manorville, NY)

2007-11-20T23:59:59.000Z

38

Interactive display of vector fields inside waveguides  

Science Journals Connector (OSTI)

The educational software package WGVMAP has been developed to enable students to plot interactively the electric and magnetic field lines of TE and TM propagating modes in cylindrical waveguides. The waveguide cross-sections considered are rectangular, ...

A. Z. Elsherbeni; D. Kajfez; J. A. Hawkes

1993-05-01T23:59:59.000Z

39

Waveguide Filter Tutorial Julius O. Smith III  

E-Print Network [OSTI]

Waveguide Filter Tutorial Julius O. Smith III Center for Computer Research in Music and Acoustics was adapted from the conference paper "Waveguide Filter Tutorial," by J.O. Smith, Proceedings

Smith III, Julius Orion

40

Second-harmonic generation in subwavelength graphene waveguides  

E-Print Network [OSTI]

We suggest a novel approach for generating second-harmonic radiation in subwavelength graphene waveguides. We demonstrate that quadratic phase matching between the plasmonic guided modes of different symmetries can be achieved in a planar double-layer geometry when conductivity of one of the layers becomes spatially modulated. We predict theoretically that, owing to graphene nonlocal conductivity, the second-order nonlinear processes can be actualized for interacting plasmonic modes with an effective grating coupler to allow external pumping of the structure and output of the radiation at the double frequency.

Smirnova, Daria

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "nonlinear waveguides view" 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

Information rate of a waveguide  

Science Journals Connector (OSTI)

We calculate the communication capacity of a broadband electromagnetic waveguide as a function of its spatial dimensions and input power. We analyze the two cases in which either all the available modes or only a single directional mode are employed. The results are compared with those for the free-space bosonic channel.

Vittorio Giovannetti; Seth Lloyd; Lorenzo Maccone; Jeffrey H. Shapiro

2004-05-13T23:59:59.000Z

42

Complex photosensitivity observed in germanosilica planar waveguides  

Science Journals Connector (OSTI)

Photosensitive effects distinguished as type I and type IIA photosensitivity within optical fibers were observed in a much more pronounced form within germanosilica waveguides...

Bazylenko, M V; Moss, D; Canning, J

1998-01-01T23:59:59.000Z

43

Graphene-based polymer waveguide polarizer  

Science Journals Connector (OSTI)

Planar-lightwave-circuit (PLC)-type graphene polarizers are fabricated by using a low loss optical polymer waveguide. The optical characteristics are investigated at a wavelength of...

Kim, Jin Tae; Choi, Choon-Gi

2012-01-01T23:59:59.000Z

44

Type-0 second order nonlinear interaction in monolithic waveguides of  

E-Print Network [OSTI]

. 59, 2044­2046 (1987). 3. I. Shoji, T. Kondo, A. Kitamoto, M. Shirane, and R. Ito, "Absolute scale­10748 (2005). 7. B. R. West and A. S. Helmy, "Analysis and design equations for phase matching using Bragg. Aitchison, M. W. Street, N. D. Whitbread, D. C. Hutchings, J. H. Marsh, G. T. Kennedy, and W. Sibbet

45

Ultralow loss cavities and waveguides scattering loss cancellation  

DOE Patents [OSTI]

A waveguide system includes a first waveguide having surface roughness along at least one surface and a second waveguide substantially identical to the first waveguide and having substantially identical surface roughness along a corresponding side. The first and second waveguides are separated from each other by a predermined distance and are configured to receive respective first and second light signals having antisymmetric modes. The predetermined distance between the first and second waveguide tends to cause cancellation of at least far-field polarization radiation emanating from the first and second waveguides and resulting from surface roughness.

Rakich, Peter T

2014-01-07T23:59:59.000Z

46

Optical planar waveguide for cell counting  

Science Journals Connector (OSTI)

Low cost counting of cells has medical applications in screening military medicine disaster medicine and rural healthcare. In this report we present a shallow buried planar waveguide fabricated by potassium ion exchange in glass that enables low-cost and rapid counting of metal-tagged objects that lie in the evanescent field of the waveguide. Laser light transmitted through the waveguide was attenuated proportionately to the presence of metal-coated microstructures fabricated from photoresist. This technology enables the low-cost enumeration of cells from blood urine or other biofluids.

John LeBlanc; Andrew J. Mueller; Adrian Prinz; Manish J. Butte

2012-01-01T23:59:59.000Z

47

Waveguide-based optical chemical sensor  

DOE Patents [OSTI]

The invention provides an apparatus and method for highly selective and sensitive chemical sensing. Two modes of laser light are transmitted through a waveguide, refracted by a thin film host reagent coating on the waveguide, and analyzed in a phase sensitive detector for changes in effective refractive index. Sensor specificity is based on the particular species selective thin films of host reagents which are attached to the surface of the planar optical waveguide. The thin film of host reagents refracts laser light at different refractive indices according to what species are forming inclusion complexes with the host reagents.

Grace, Karen M. (Ranchos de Taos, NM); Swanson, Basil I. (Los Alamos, NM); Honkanen, Seppo (Tucson, AZ)

2007-03-13T23:59:59.000Z

48

Silicon nano grid waveguide for coupling between multimode fiber (MMF) and silicon nano waveguide  

Science Journals Connector (OSTI)

We present a new silicon waveguide configuration which enables a mode field expansion more than several tens of micrometers. It maintains singlemode operation condition and gradient...

An, Shinmo; Lee, El-Hang

49

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

50

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

51

Multistaged stokes injected Raman capillary waveguide amplifier  

DOE Patents [OSTI]

A multistaged Stokes injected Raman capillary waveguide amplifier for providing a high gain Stokes output signal. The amplifier uses a plurality of optically coupled capillary waveguide amplifiers and one or more regenerative amplifiers to increase Stokes gain to a level sufficient for power amplification. Power amplification is provided by a multifocused Raman gain cell or a large diameter capillary waveguide. An external source of CO.sub.2 laser radiation can be injected into each of the capillary waveguide amplifier stages to increase Raman gain. Devices for injecting external sources of CO.sub.2 radiation include: dichroic mirrors, prisms, gratings and Ge Brewster plates. Alternatively, the CO.sub.2 input radiation to the first stage can be coupled and amplified between successive stages.

Kurnit, Norman A. (Santa Fe, NM)

1980-01-01T23:59:59.000Z

52

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

53

Spontaneous emission into a planar optical waveguide mode by an atom outside the waveguide  

E-Print Network [OSTI]

An electronically excited atom or molecule located outside but near a planar optical waveguide can decay by spontaneous emission of a photon into a guided mode of the waveguide. We outline a QED theory for calculating the probability for this process and describe general physical insights from that theory. A couple of representative examples are discussed in detail.

Andrei Modoran; Gregory Lafyatis

2006-09-18T23:59:59.000Z

54

Propagation of nonlinearly generated harmonic spin waves in microscopic stripes  

SciTech Connect (OSTI)

We report on the experimental study of the propagation of nonlinearly generated harmonic spin waves in microscopic CoFeB stripes. Using an all electrical technique with coplanar waveguides, we find that two kinds of spin waves can be generated by nonlinear frequency multiplication. One has a non-uniform spatial geometry and thus requires appropriate detector geometry to be identified. The other corresponds to the resonant fundamental propagative spin waves and can be efficiently excited by double- or triple-frequency harmonics with any geometry. Nonlinear excited spin waves are particularly efficient in providing an electrical signal arising from spin wave propagation.

Rousseau, O. [Center for Emergent Matter Science, RIKEN, 2-1 Hirosawa, Wako 351-0198 (Japan); Yamada, M.; Miura, K.; Ogawa, S. [Hitachi, Ltd., Central Research Laboratory, 1-280 Higashi-koigakubo, Kokubunji, Tokyo 185-8601 (Japan); Otani, Y., E-mail: yotani@issp.u-tokyo.ac.jp [Center for Emergent Matter Science, RIKEN, 2-1 Hirosawa, Wako 351-0198 (Japan); Institute for Solid State Physics, University of Tokyo, Kashiwa 277-858 (Japan)

2014-02-07T23:59:59.000Z

55

Design of a high index contrast arrayed waveguide grating  

E-Print Network [OSTI]

Arrayed waveguide gratings (AWGs) are useful structures for the implementation of wavelength division multiplexing. The AWG consists of an input splitter, a dispersive waveguide array which creates the wavelength demultiplexing ...

Lang, Ryan N. (Ryan Nathan)

2003-01-01T23:59:59.000Z

56

Efficient power coupling to waveguides in high index contrast systems  

E-Print Network [OSTI]

Future integrated optical circuits will hold, on a single chip, several optical components that communicate via high index contrast waveguides. Silicon nitride (SixNy) and silicon oxynitride (SixOyNz) waveguides with silicon ...

Nguyen, Victor T. (Victor Trinh)

2006-01-01T23:59:59.000Z

57

Radio-frequency-excited carbon dioxide metal waveguide laser  

Science Journals Connector (OSTI)

A new type of waveguide laser is described in which a single-surface concave metal waveguide also doubles as the grounded electrode in a radio-frequency-excited gaseous discharge. The...

Grossman, Jonathan G; Casperson, Lee W; Stafsudd, Oscar M

1983-01-01T23:59:59.000Z

58

Fabrication of Annealed Proton-Exchanged Waveguides for Vertical Integration  

E-Print Network [OSTI]

There is a drive for improving the surface uniformity of optical waveguide devices in the photonics lab. This report focuses on the exploration of annealed proton exchange (APE) waveguide fabrication on lithium niobate crystal as a method...

Webb, Jacob Douglas

2011-08-08T23:59:59.000Z

59

Nonlinear Pulsations  

E-Print Network [OSTI]

We review some of the recent advances in nonlinear pulsation theory, but also insist on some of the major extant shortcomings.

J. Robert Buchler

1997-07-25T23:59:59.000Z

60

Microminiature optical waveguide structure and method for fabrication  

DOE Patents [OSTI]

A method for manufacturing low-cost, nearly circular cross section waveguides comprises starting with a substrate material that a molten waveguide material can not wet or coat. A thin layer is deposited of an opposite material that the molten waveguide material will wet and is patterned to describe the desired surface-contact path pedestals for a waveguide. A waveguide material, e.g., polymer or doped silica, is deposited. A resist material is deposited and unwanted excess is removed to form pattern masks. The waveguide material is etched away to form waveguide precursors and the masks are removed. Heat is applied to reflow the waveguide precursors into near-circular cross-section waveguides that sit atop the pedestals. The waveguide material naturally forms nearly circular cross sections due to the surface tension effects. After cooling, the waveguides will maintain the round shape. If the width and length are the same, then spherical ball lenses are formed. Alternatively, the pedestals can be patterned to taper along their lengths on the surface of the substrate. This will cause the waveguides to assume a conical taper after reflowing by heat.

Strand, Oliver T. (Castro Valley, CA); Deri, Robert J. (Pleasanton, CA); Pocha, Michael D. (Livermore, CA)

1998-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "nonlinear waveguides view" 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

Microminiature optical waveguide structure and method for fabrication  

DOE Patents [OSTI]

A method for manufacturing low-cost, nearly circular cross section waveguides comprises starting with a substrate material that a molten waveguide material can not wet or coat. A thin layer is deposited of an opposite material that the molten waveguide material will wet and is patterned to describe the desired surface-contact path pedestals for a waveguide. A waveguide material, e.g., polymer or doped silica, is deposited. A resist material is deposited and unwanted excess is removed to form pattern masks. The waveguide material is etched away to form waveguide precursors and the masks are removed. Heat is applied to reflow the waveguide precursors into near-circular cross-section waveguides that sit atop the pedestals. The waveguide material naturally forms nearly circular cross sections due to the surface tension effects. After cooling, the waveguides will maintain the round shape. If the width and length are the same, then spherical ball lenses are formed. Alternatively, the pedestals can be patterned to taper along their lengths on the surface of the substrate. This will cause the waveguides to assume a conical taper after reflowing by heat. 32 figs.

Strand, O.T.; Deri, R.J.; Pocha, M.D.

1998-12-08T23:59:59.000Z

62

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

63

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

64

Compact waveguide power divider with multiple isolated outputs  

DOE Patents [OSTI]

A waveguide power divider (10) for splitting electromagnetic microwave power and directionally coupling the divided power includes an input waveguide (21) and reduced height output waveguides (23) interconnected by axial slots (22) and matched loads (25) and (26) positioned at the unused ends of input and output guides (21) and (23) respectively. The axial slots are of a length such that the wave in the input waveguide (21) is directionally coupled to the output waveguides (23). The widths of input guide (21) and output guides (23) are equal and the width of axial slots (22) is one half of the width of the input guide (21).

Moeller, Charles P. (Del Mar, CA)

1987-01-01T23:59:59.000Z

65

A Non-Pyramidal Rectangular-to-Trough Waveguide Transition and Pattern Reconfigurable Trough Waveguide Antenna  

E-Print Network [OSTI]

, rods, dielectrics, and other structures can create reconfigurable periodic line sources. These trough waveguide antennas (TWA) are then capable of providing both fixedfrequency and frequency-dependent beam steering. This was originally performed using...

Loizou, Loizos

2012-02-14T23:59:59.000Z

66

Key components for nano-assembled plasmon-excited single molecule non-linear devices  

E-Print Network [OSTI]

Tremendous enhancement of light-matter interaction in plasmon-excited molecular hybrid devices allows for non-linearities on the level of single emitters and few photons. This promises a plethora of novel applications like single photon transistors. Nevertheless, building the components of such devices is technologically extremely challenging. We tackle this task by lithographically fabricating on-chip plasmonic waveguides, efficiently connected to far-field in- and out-coupling ports via low-loss dielectric waveguides. Furthermore, a nano-assembling technology is developed, enabling the controlled coupling of single organic emitters to the plasmonic waveguides. Dibenzoterrylene fluorescent molecules hosted in anthracene crystals are investigated for this purpose. Here we present all key-components and technologies for a plasmon-excited single molecule non-linear device.

Kewes, Günter; Mazzamuto, Giacomo; Neitzke, Oliver; Schönfeld, Rolf-Simon; Schell, Andreas W; Probst, Jürgen; Wolters, Janik; Löchel, Bernd; Toninelli, Costanza; Benson, Oliver

2015-01-01T23:59:59.000Z

67

Planned waveguide electric field breakdown studies  

SciTech Connect (OSTI)

This paper presents an experimental setup for X-band rf breakdown studies. The setup is composed of a section of WR90 waveguide with a tapered pin located at the middle of the waveguide E-plane. Another pin is used to rf match the waveguide so it operates in a travelling wave mode. By adjusting the penetration depth of the tapered pin, different surface electric field enhancements can be obtained. The setup will be used to study the rf breakdown rate dependence on power flow in the waveguide for a constant maximum surface electric field on the pin. Two groups of pins have been designed. The Q of one group is different and very low. The other has a similar Q. With the test of the two groups of pins, we should be able to discern how the net power flow and Q affect the breakdown. Furthermore, we will apply an electron beam treatment to the pins to study its effect on breakdown. Overall, these experiments should be very helpful in understanding rf breakdown phenomena and could significantly benefit the design of high gradient accelerator structures.

Wang Faya; Li Zenghai [SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025 (United States)

2012-12-21T23:59:59.000Z

68

Sferic propagation in the cutoff region of the earth-ionosphere waveguide  

E-Print Network [OSTI]

The waveguide cutoff phenomenon provides information about the height of a waveguide. This cutoff for the earth-ionosphere waveguide is illuminated by lightning sferics and is used to monitor the change in ionosphere height ...

Surana, Kunal K. (Kunal Krishna), 1979-

2004-01-01T23:59:59.000Z

69

Neutron and gamma radiation effects in proton exchanged optical waveguides  

Science Journals Connector (OSTI)

The effect of neutron and gamma ray irradiations on the optical properties of proton exchanged Z-cut lithium niobate optical planar waveguides were investigated. The damage thresholds...

Passaro, Vittorio; Armenise, Mario

2002-01-01T23:59:59.000Z

70

Graphene-based plasmonic waveguides for photonic integrated circuits  

Science Journals Connector (OSTI)

We perform experimental investigations on the characteristics of graphene-based plasmonic waveguides for development of photonic integrated circuits. By embedding chemical vapor...

Kim, Jin Tae; Choi, Sung-Yool

2011-01-01T23:59:59.000Z

71

Graphene-assisted control of coupling between optical waveguides  

Science Journals Connector (OSTI)

The unique properties of optical waveguides electrically controlled by means of graphene layers are investigated. We demonstrate that, thanks to tunable losses induced by graphene...

Locatelli, Andrea; Capobianco, Antonio-Daniele; Midrio, Michele; Boscolo, Stefano; De Angelis, Costantino

2012-01-01T23:59:59.000Z

72

Graphene-supported tunable waveguide structure in the terahertz regime  

Science Journals Connector (OSTI)

The tunable waveguide properties of the graphene supporting structure Si–SiO2–graphene–dielectrics–graphene–SiO2–Si...

He, Xiaoyong; Kim, Sangin

2013-01-01T23:59:59.000Z

73

Synthesis and analysis of planar optical waveguides with prescribed TM modes  

Science Journals Connector (OSTI)

An inverse-scattering approach to designing optical waveguides with prescribed propagation characteristics of TM modes is presented. The refractive-index profile of the waveguide is...

Tamil, Lakshman S; Lin, Yun

1993-01-01T23:59:59.000Z

74

Graphene oxide-based waveguide polariser: From thin film to quasi-bulk  

Science Journals Connector (OSTI)

Abstract: We have demonstrated a broadband waveguide polariser with high extinction ratio on a polymer optical waveguide coated with graphene oxide via the drop-casting method. The...

Lim, W H; Yap, Y K; Chong, W Y; Pua, C H; Huang, N M; De La Rue, R M; Ahmad, H

2014-01-01T23:59:59.000Z

75

High?frequency cutoff periodic dielectric waveguides  

Science Journals Connector (OSTI)

We report high?frequency cutoff in periodic dielectric waveguides. The guides consisted of 1?? photoresist film with a surface corrugation of up to 500 Å overlaid on fused silica substrates. At a wavelength of 1.064 ? we obtained transition between complete cutoff and propagation by variation in the periodicity of the guide of ± 30 Å. For gratings having 500?Å corrugation unobstructed propagation at 1.32 ? occurred with complete stopping of 1.064?? light.

F.W. Dabby; M.A. Saifi; A. Kestenbaum

1973-01-01T23:59:59.000Z

76

PECVD Silicon Carbide Waveguides for Multichannel G. Pandraud  

E-Print Network [OSTI]

PECVD Silicon Carbide Waveguides for Multichannel Sensors G. Pandraud Kavli Institute of Nano Deposition (PECVD) Silicon Carbide (SiC) waveguides. Thin SiC films have been deposited onto Si substrates with a SiO2 film acting as a cladding layer around the carbide core. In the sensor, the evanescent tale

Technische Universiteit Delft

77

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

78

Magnetically and electrically tunable semiconductor quantum waveguide inverter  

E-Print Network [OSTI]

Magnetically and electrically tunable semiconductor quantum waveguide inverter M. J. Gilbert,a) R implementations. We present an electrically tunable semiconductor quantum waveguide implementation of an inverter. On the other hand, if a ``0'' is present in the control bit, then the qubit is inverted. In a recent study

Gilbert, Matthew

79

Hollow cylindrical plasma filament waveguide with discontinuous finite thickness cladding  

SciTech Connect (OSTI)

We have explored here a hollow cylindrical laser plasma multifilament waveguide with discontinuous finite thickness cladding, in which the separation between individual filaments is in the range of several millimeters and the waveguide cladding thickness is in the order of the microwave penetration depth. Such parameters give a closer representation of a realistic laser filament waveguide sustained by a long stable propagation of femtosecond (fs) laser pulses. We report how the waveguide losses depend on structural parameters like normalized plasma filament spacing, filament to filament distance or pitch, normal spatial frequency, and radius of the plasma filament. We found that for typical plasma parameters, the proposed waveguide can support guided modes of microwaves in extremely high frequency even with a cladding consisting of only one ring of plasma filaments. The loss of the microwave radiation is mainly caused by tunneling through the discontinuous finite cladding, i.e., confinement loss, and is weakly dependent on the plasma absorption. In addition, the analysis indicates that the propagation loss is fairly large compared with the loss of a plasma waveguide with a continuous infinite thickness cladding, while they are comparable when using a cladding contains more than one ring. Compared to free space propagation, this waveguide still presents a superior microwave transmission to some distance in the order of the filamentation length; thus, the laser plasma filaments waveguide may be a potential channel for transporting pulsed-modulated microwaves if ensuring a long and stable propagation of fs laser pulses.

Alshershby, Mostafa; Hao Zuoqiang; Lin Jingquan [School of Science, Changchun University of Science and Technology, Changchun 130022 (China)

2013-01-15T23:59:59.000Z

80

Modal analysis and coupling in metal-insulator-metal waveguides  

Science Journals Connector (OSTI)

This paper shows how to analyze plasmonic metal-insulator-metal waveguides using the full modal structure of these guides. The analysis applies to all frequencies, particularly including the near infrared and visible spectrum, and to a wide range of sizes, including nanometallic structures. We use the approach here specifically to analyze waveguide junctions. We show that the full modal structure of the metal-insulator-metal (MIM) waveguides—which consists of real and complex discrete eigenvalue spectra, as well as the continuous spectrum—forms a complete basis set. We provide the derivation of these modes using the techniques developed for Sturm-Liouville and generalized eigenvalue equations. We demonstrate the need to include all parts of the spectrum to have a complete set of basis vectors to describe scattering within MIM waveguides with the mode-matching technique. We numerically compare the mode-matching formulation with finite-difference frequency-domain analysis and find very good agreement between the two for modal scattering at symmetric MIM waveguide junctions. We touch upon the similarities between the underlying mathematical structure of the MIM waveguide and the PT symmetric quantum-mechanical pseudo-Hermitian Hamiltonians. The rich set of modes that the MIM waveguide supports forms a canonical example against which other more complicated geometries can be compared. Our work here encompasses the microwave results but extends also to waveguides with real metals even at infrared and optical frequencies.

?ükrü Ekin Kocaba?; Georgios Veronis; David A. B. Miller; Shanhui Fan

2009-01-26T23:59:59.000Z

Note: This page contains sample records for the topic "nonlinear waveguides view" 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

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

82

Nanoscale atomic waveguides with suspended carbon nanotubes  

E-Print Network [OSTI]

We propose an experimentally viable setup for the realization of one-dimensional ultracold atom gases in a nanoscale magnetic waveguide formed by single doubly-clamped suspended carbon nanotubes. We show that all common decoherence and atom loss mechanisms are small guaranteeing a stable operation of the trap. Since the extremely large current densities in carbon nanotubes are spatially homogeneous, our proposed architecture allows to overcome the problem of fragmentation of the atom cloud. Adding a second nanowire allows to create a double-well potential with a moderate tunneling barrier which is desired for tunneling and interference experiments with the advantage of tunneling distances being in the nanometer regime.

V. Peano; M. Thorwart; A. Kasper; R. Egger

2005-11-23T23:59:59.000Z

83

Nanometric constrictions in superconducting coplanar waveguide resonators  

E-Print Network [OSTI]

We report on the design, fabrication and characterization of superconducting coplanar waveguide resonators with nanoscopic constrictions. By reducing the size of the center line down to 50 nm, the radio frequency currents are concentrated and the magnetic field in its vicinity is increased. The device characteristics are only slightly modified by the constrictions, with changes in resonance frequency lower than 1% and internal quality factors of the same order of magnitude as the original ones. These devices could enable the achievement of higher couplings to small magnetic samples or even to single molecular spins and have applications in circuit quantum electrodynamics, quantum computing and electron paramagnetic resonance.

Mark David Jenkins; Uta Naether; Miguel Ciria; Javier Sesé; James Atkinson; Carlos Sánchez-Azqueta; Enrique del Barco; Johannes Majer; David Zueco; Fernando Luis

2014-09-03T23:59:59.000Z

84

Quasi-phase matching and quantum control of high harmonic generation in waveguides using counterpropagating beams  

DOE Patents [OSTI]

All-optical quasi-phase matching (QPM) uses a train of counterpropagating pulses to enhance high-order harmonic generation (HHG) in a hollow waveguide. A pump pulse enters one end of the waveguide, and causes HHG in the waveguide. The counterpropagation pulses enter the other end of the waveguide and interact with the pump pulses to cause QPM within the waveguide, enhancing the HHG.

Zhang, Xiaoshi (Superior, CO); Lytle, Amy L. (Boulder, CO); Cohen, Oren (Boulder, CO); Kapteyn, Henry C. (Boulder, CO); Murnane, Margaret M. (Boulder, CO)

2010-11-09T23:59:59.000Z

85

Transport and Quantum Walk of Nonclassical Light in Coupled Waveguides  

E-Print Network [OSTI]

We study the transport and quantum walk of nonclassical light in an array of coupled waveguides which have novel properties like very low decoherence and thus making them ideal for storage of quantum information. We show how squeezing gets turned over from one waveguide to another. We further show how input nonclassical light can generate entanglement among different waveguides. Our results involve both first quantization due to array structure and second quantization due to the quantum nature of fields and can also be used to discuss the Talbot effect in the quantum regime.

Amit Rai; G. S. Agarwal; J. H. H. Perk

2008-07-19T23:59:59.000Z

86

Waveguide submillimetre laser with a uniform output beam  

SciTech Connect (OSTI)

A method for producing non-Gaussian light beams with a uniform intensity profile is described. The method is based on the use of a combined waveguide quasi-optical resonator containing a generalised confocal resonator with an inhomogeneous mirror with absorbing inhomogeneities discretely located on its surface and a hollow dielectric waveguide whose size satisfies the conditions of self-imaging of a uniform field in it. The existence of quasi-homogeneous beams at the output of an optically pumped 0.1188-mm waveguide CH{sub 3}OH laser with a amplitude-stepped mirror is confirmed theoretically and experimentally. (lasers)

Volodenko, A V; Gurin, O V; Degtyarev, A V; Maslov, Vyacheslav A; Svich, V A; Topkov, A N [V.N. Karazin Kharkiv National University, Kharkiv (Ukraine)

2007-01-31T23:59:59.000Z

87

User_ViewRecords  

Broader source: Energy.gov (indexed) [DOE]

User Records User Records © 2011 SuccessFactors, Inc. - 1 - SuccessFactors Learning Confidential. All rights reserved. Job Aid: Viewing User Records Purpose The purpose of this job aid is to guide users through the step-by-step process of viewing their records. Each task demonstrates viewing of different records. Task A. View To-Do List Enter the web address (URL) of the user application into your browser Address field and press the Enter key. Enter your user ID in the User ID textbox. Enter your password in the Password textbox. Click Sign In. View To-Do List (filter, view) 7 Steps Task A View Completed Work 8 Steps Task B View Curriculum Status and Details 11 Steps Task C 3 3 1 2 2 1 SuccessFactors Learning v 6.4 User Job Aid Viewing User Records

88

Erbium-doped Lithium Niobate waveguide lasers: recent progress  

E-Print Network [OSTI]

in Ti/Fe- and in Ti/Fe/Er-codoped waveguide sections. Single frequency emission at several wavelengths diameter with a laser diode ( = 1480 nm) clockwise and counter-clockwise lasing at = 1603 nm has been

Mohseni, Hooman

89

On Acoustic Transmission in Ocean-Surface Waveguides  

Science Journals Connector (OSTI)

...surface. The bubble layer acts as a waveguide for sound in the audio frequency range, above 2 kHz, although transmission may be severely...extend access to Philosophical Transactions: Physical Sciences and Engineering. www.jstor.org

1991-01-01T23:59:59.000Z

90

Parallel recording with optical waveguide array Haifeng Wang*a  

E-Print Network [OSTI]

a linear array of laser diodes onto different tracks operated in the far-field1-5 , and using a linear-mode rectangular waveguide. The material of the guide layer is SiN (n=2.05) and of the cladding layer is SiO2 (n=1.47). The thickness of the cladding (guide) layers are 1100 (800) nm for the multi-mode waveguide and 1120 (160) nm

91

Broadband 100 GHz Substrate-Integrated Waveguide Couplers with Irregularly Shaped Via Holes for  

E-Print Network [OSTI]

, the compromise is often between accurate and expensive CNC or EDM machining of waveguide technology on one hand

Bornemann, Jens

92

A View from home  

Science Journals Connector (OSTI)

... being studied by means of their nonlinear excitation through optical mixing of laser beams; and synchroton radiation is being employed, along with low energy electron diffraction (LEED), to ascertain ...

Andrew M. Sessler

1976-10-21T23:59:59.000Z

93

Views on Automation  

Science Journals Connector (OSTI)

Views on Automation ... Industrial managements, he feels, must allay workers' fears by showing how they can take pride in the greater accomplishment of automated plants. ...

1957-07-29T23:59:59.000Z

94

Towards photonic integrated circuits : design and fabrication of passive InP waveguide bends  

E-Print Network [OSTI]

Waveguide bends, in the (In,Ga)(As,P) material system, have been simulated, fabricated and tested. A process is developed for waveguides of 1 [micro]m through 7[micro]m widths. Waveguides containing S-bends of varying ...

Rodriguez, Sarah J. (Sarah Janelle), 1979-

2004-01-01T23:59:59.000Z

95

An integrated thin-film thermo-optic waveguide beam deflector Suning Tang,a)  

E-Print Network [OSTI]

An integrated thin-film thermo-optic waveguide beam deflector Suning Tang,a) Bulang Li, and Xinghua for publication 16 February 2000 We have demonstrated the operation of a thin-film thermo-optical beam deflector in a three-layer optical planar waveguide. The fabricated waveguide beam deflector consists of a thin-film Si

Chen, Ray

96

Thin film optical waveguide and optoelectronic device integration for fully embedded board level optical interconnects  

E-Print Network [OSTI]

Thin film optical waveguide and optoelectronic device integration for fully embedded board level on to the waveguide film. Measured propagation loss of the waveguide was 0.3dB/cm at 850nm. Keywords: optoelectronic between electronic and optoelectronic components as conventional approaches do, and additionally, real

Chen, Ray

97

Ris-PhD-15(EN) Metal-Clad Waveguide Sensors  

E-Print Network [OSTI]

Risø-PhD-15(EN) Metal-Clad Waveguide Sensors Nina Skivesen Risø National Laboratory Roskilde Denmark September 2005 #12;Author: Nina Skivesen Title: Metal-Clad Waveguide Sensors Department: OPL Risø: 77 Abstract (max. 2000 char.): This work concerns planar optical waveguide sensors for biosensing

98

1D-to-2D tunneling in electron waveguides  

Science Journals Connector (OSTI)

We present a comprehensive experimental study of the tunneling and transport characteristics of split-gate ‘‘leaky’’ one-dimensional (1D) electron waveguides implemented in AlxGa1-xAs/GaAs heterostructures. In a leaky electron waveguide, electrons can tunnel out of the 1D channel through a thin side wall barrier into an adjacent 2D electron bath. A sharp peak and valley structure is observed in the 1D-to-2D tunneling current as the carrier concentration is modulated in the 1D waveguide through the field-effect action of the split gates. A semiclassical model confirms that the tunneling features originate from the 1D subbands in the channel.

Cristopher C. Eugster; Jesús A. del Alamo; Michael R. Melloch; Michael J. Rooks

1993-11-15T23:59:59.000Z

99

Organic Solar Cells as Polymer Waveguide Integrated Photodetectors  

Science Journals Connector (OSTI)

Abstract We report on the integration of an organic photodetector into a polymer waveguide. The photodetector is based on thin film organic solar cells using Zinc phtalocyanine and Fulleren C60 (ZnPc:C60) as photoactive material. This approach comprises the potential for an ease of production of active electro optical components on passive optical elements. By using organic materials low cost production of integrated devices on uneven surfaces becomes possible. In first experiments we show the potential of ZnPc:C60 solar cells as photodetectors at a wavelength of 635 nm. We perform simulations of this detectors put on the top surface of a polymer multi-mode waveguide. The simulation shows how light, which is guided through the waveguide can be efficiently absorbed by the photodetector without complex coupling structures.

Torsten Otto; Torsten Rabe; Sebastian Döring; Wolfgang Kowalsky

2014-01-01T23:59:59.000Z

100

Planar chalcogenide glass waveguides for IR evanescent wave sensors  

SciTech Connect (OSTI)

Multi-layered chalcogenide glass waveguide structures have been fabricated for evanescent wave sensing of bio-toxins and other sensor applications. Thin films of Ge containing chalcogenides have been deposited onto Si substrates, with a-GeSe2 as the lower cladding layer and a-GeSbSe as the core layer, to form the slab waveguide. The absence of a defined upper cladding layer enhances the leakage necessary to sense the target molecules. Modal refractive index is estimated from the m-lines. It is shown that photo-induced structural changes by 808 nm laser light in the core layer selectively enhance refractive index in the exposed regions, and thus provide a convenient method to form channel waveguides. A thin layer of Au has been deposited on top of the core layer for the attachment of linker molecules for biosensor application; ATR confirms this.

Ganjoo, Ashtosh; Jain, H.; Yu, C.; Song, R.; Ryan, Joseph V.; Irudayaraj, Chanda J.; Ding, Y. J.; Pantano, C. G.

2006-03-20T23:59:59.000Z

Note: This page contains sample records for the topic "nonlinear waveguides view" 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

NEWS & VIEWS Glass dynamics  

E-Print Network [OSTI]

NEWS & VIEWS Glass dynamics Diverging views on glass transition Gregory B. mc.mckenna@ttu.edu T he glass transition is one of the most intriguing phenomena in the world of soft condensed matter. Despite decades of study, many aspects of the behaviour of glass-forming liquids remain elusive

Weeks, Eric R.

102

News and Views  

Science Journals Connector (OSTI)

......Model 8600 and 8700 gas chromatographs to...untended operation of the gas chromatograph under...0325) 311044. 133 News and Views Macintosh-compatible...speed of the Apple drives and a software incompatibility...for a corporate 134 News and Views licence...that Chem-X was the natural choice: 'Chem-X......

Alan H. Fielding

1990-04-01T23:59:59.000Z

103

Analysis of transverse apertures in a circular waveguide  

E-Print Network [OSTI]

, (r, g, z) + H, (r, g, z) = h(r, g)en&' + h, (r, P)ei"*' where E, and H, are the transverse field components and E, and H, are the axial field components of the waveguide fields. By substitution of the previous decompositions into Maxwell's equauons... equation Vzhz + gihz =0 h, is equal to the scalar function V given in equation (10. b). Therefore, the axial magnetic field can be written as hx = ttr = J?(k, r) ( sin(nP) or cos(ntIt) ) e-i? (17) 15 For the circular waveguide cross section shown...

Eastham, Gary Bryan

2012-06-07T23:59:59.000Z

104

Numerical simulation of waveguides of arbitrary cross section.  

SciTech Connect (OSTI)

Finite difference equations are derived for the simulation of dielectric waveguides using an H{sub z}-E{sub z} formulation defined on a nonuniform triangular grid. The resulting equations may be solved as a banded eigenproblem for waveguide structures of arbitrary shape composed of regions of piecewise constant isotropic dielectric, and all transverse fields then computed from the solutions. Benchmark comparisons are presented for problems with analytic solutions, as well as a sample calculation of the propagation loss of a hollow Bragg fiber.

Hadley, G. Ronald

2003-09-01T23:59:59.000Z

105

Theory of Optical Bloch Oscillations in the Zigzag Waveguide Array  

E-Print Network [OSTI]

The Bloch oscillations in the zigzag array of the optical waveguides are considered. The multiple scattering formalism (MSF) is used for the numerical simulation of the optical beam which propagates within the array. The effect of the second-order coupling which depends on the geometrical parameters of the array is investigated. The results obtained within the MSF are compared with the calculation based on the phenomenological coupling modes model. The calculations are performed for the waveguides fabricated in alkaline earth boro-aluminosilicate glass sample, which are the most promising for the C-band (1530-1565 nm).

Babichenko, V S; Kagan, Yu M; Polishchuk, I Ya; Tsyvkunova, E A

2015-01-01T23:59:59.000Z

106

Taking the long view  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Taking the long view Taking the long view Taking the long view on environmental stewardship A newly articulated mission for environmental stewardship at the Laboratory can be summed up in a simple phrase: clean up the past, control current operations, and create a sustainable future. March 20, 2012 Los Alamos Aerial Aerial view of a canyon in Los Alamos, New Mexico. Contact Environmental Communication & Public Outreach P.O. Box 1663 MS M996 Los Alamos, NM 87545 (505) 667-0216 Email "The future viability of the Lab hinges on demonstrating to public that we protect human health and the environment." Environmental stewardship strategy looks 50 years into the future As a way of integrating environmental protection activities into a comprehensive strategy, Kevin Smith, manager of the U.S. Department of

107

Deep subwavelength plasmonic waveguide switch in double graphene layer structure  

E-Print Network [OSTI]

Deep subwavelength plasmonic waveguide switch in double graphene layer structure Hideo Iizuka in double graphene layer structure Hideo Iizuka1,a) and Shanhui Fan2,b) 1 Toyota Central Research December 2013) Graphene provides excellent prospects of the dynamic tunability, low propagation loss

Fan, Shanhui

108

Clustered gases as a medium for efficient plasma waveguide generation  

Science Journals Connector (OSTI)

...on-axis density of a plasma waveguide is determined...or Bessel beam) line focus breakdown of a gas using...heater of the cluster plasma despite the fact that...a Bessel-beam line focus breakdown in an elongated...axicon which heat the plasma and are transmitted through...

2006-01-01T23:59:59.000Z

109

Spontaneous symmetry breaking in Schroedinger lattices with two nonlinear sites  

SciTech Connect (OSTI)

We introduce discrete systems in the form of straight (infinite) and ring-shaped chains, with two symmetrically placed nonlinear sites. The systems can be implemented in nonlinear optics (as waveguiding arrays) and Bose-Einstein condensates (by means of an optical lattice). A full set of exact analytical solutions for symmetric, asymmetric, and antisymmetric localized modes is found, and their stability is investigated in a numerical form. The symmetry-breaking bifurcation, through which the asymmetric modes emerge from the symmetric ones, is found to be of the subcritical type. It is transformed into a supercritical bifurcation if the nonlinearity is localized in relatively broad domains around two central sites, and also in the ring of a small size, i.e., in effectively nonlocal settings. The family of antisymmetric modes does not undergo bifurcations and features both stable and unstable portions. The evolution of unstable localized modes is investigated by means of direct simulations. In particular, unstable asymmetric states, which exist in the case of the subcritical bifurcation, give rise to breathers oscillating between the nonlinear sites, thus restoring an effective dynamical symmetry between them.

Brazhnyi, Valeriy A.; Malomed, Boris A. [Centro de Fisica do Porto, Faculdade de Ciencias, Universidade do Porto, R. Campo Alegre 687, Porto 4169-007 (Portugal); ICFO-Institut de Ciencies Fotoniques, Universitat Politecnica de Catalunya, Mediterranean Technology Park, 08860 Castelldefels (Barcelona) (Spain) and Department of Physical Electronics, School of Electrical Engineering, Faculty of Engineering, Tel Aviv University, Tel Aviv 69978 (Israel)

2011-05-15T23:59:59.000Z

110

Prarie View RDF  

Broader source: Energy.gov (indexed) [DOE]

PRAIRIE VIEW RDF PRAIRIE VIEW RDF 2 Prairie View RDF  Located at JAAP (approx. 40 miles southwest of Chicago), 223 acres on 455 Acre Parcel  Will County Owner; Waste Management, Operator  Maximum 23-Year Life WM/Will County Methane to Energy Plant  Landfill Contract Signed w/WM in 1997 w/Gas-to- Energy Plant Clause  County Retains Gas Rights &WM Installs Gas Collection System  WM owns Methane to Energy Plant &Tax Credits 3 CONTRACT PHASE  DOE Grant Applied 6/09  County Board Approves DOE EECBG Strategy 11/09  1 Million DOE Funds to Methane to Energy Plant  Schiff Harden Hired to Negotiate Gas to Energy Contract  February 2010 County Board Authorizes Contract Execution 4 5 METHANE TO ENERGY PLANT DETAILS  Waste Management Required To

111

View dependent fluid dynamics  

E-Print Network [OSTI]

VIEW DEPENDENT FLUID DYNAMICS A Thesis by BRIAN ARTHUR BARRAN Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE May 2006 Major Subject: Visualization... Sciences VIEW DEPENDENT FLUID DYNAMICS A Thesis by BRIAN ARTHUR BARRAN Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE Approved by: Chair of Committee, Donald...

Barran, Brian Arthur

2006-08-16T23:59:59.000Z

112

NONLINEAR ELASTIC WAVE NDE II. NONLINEAR WAVE MODULATION SPECTROSCOPY AND NONLINEAR TIME  

E-Print Network [OSTI]

NONLINEAR ELASTIC WAVE NDE II. NONLINEAR WAVE MODULATION SPECTROSCOPY AND NONLINEAR TIME REVERSED. This paper presents the second part of the review of Nonlinear Elastic Wave Spectroscopy (NEWS) in NDE, and describe two different methods of nonlinear NDE that provide not only damage detection but location as well

113

News and Views  

Science Journals Connector (OSTI)

... -16. The discussions on road lighting, from the point of view both of the pedestrian and the car driver, were valuable, as they show how complex the problem is ... problem is, depending as it does on difficult questions of physiology and psychology. The pedestrian wants to see small obstructions on the road and the numbers on the houses; ...

1928-07-28T23:59:59.000Z

114

Vector Network Analyzer Techniques to measure WR340 Waveguide Windows  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

6 6 Vector Network Analyzer Techniques to Measure WR340 Waveguide Windows T. L. Smith ASD / RF Group Advanced Photon Source Argonne National Laboratory June 26, 2002 Table of Contents 1) Introduction 2) Objective 3) Full Two-Port Calibration 4) TRL (Thru-Reflect-Line) 5) TRL / WR340 Waveguide Window Measurement 6) Conclusions 7) References 1. Introduction In its fundamental form, network analysis involves the measurement of incident, reflected, and transmitted waves that travel along transmission lines. Measuring both magnitude and phase of components is important for several reasons. First, both measurements are required to fully characterize a linear network and ensure distortion- free transmission. To design effective matching networks, complex impedances must be

115

Hybrid plasmonic waveguide in a metal V-groove  

SciTech Connect (OSTI)

We propose and investigate a type of hybrid plasmonic waveguide in a metal V-groove. A high-permittivity nanowire was placed in the metal channel covered with a dielectric film of lower permittivity. Deeper sub-wavelength confinement and much longer propagation distance were achieved in comparison with conventional channel plasmonic waveguides. The overall performance was improved as compared with the conventional hybrid plasmonic structure based on a flat metal surface. Finite element analysis showed that both the mode propagation and field profile can be adjusted by changing the nanowire radius and film thickness. Some benefits, such as a reduced scattering loss caused by the surface roughness, are also expected owing to the unique mode profile. The proposed approach has potential for application in high-level photonic integration.

Chen, Zhao-xian; Wu, Zi-jian; Ming, Yang; Zhang, Xue-jin, E-mail: xuejinzh@nju.edu.cn; Lu, Yan-qing, E-mail: yqlu@nju.edu.cn [National Laboratory of Solid State Microstructures and College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093 (China)] [National Laboratory of Solid State Microstructures and College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093 (China)

2014-01-15T23:59:59.000Z

116

Method of fabricating optical waveguides by ion implantation doping  

DOE Patents [OSTI]

A method for fabricating high-quality optical waveguides in optical quality oxide crystals by ion implantation doping and controlled epitaxial recrystallization is provided. Masked LiNbO/sub 3/ crystals are implanted with high concentrations of Ti dopant at ion energies of about 360 keV while maintaining the crystal near liquid nitrogen temperature. Ion implantation doping produces an amorphous, Ti-rich nonequilibrium phase in the implanted region. Subsequent thermal annealing in a water-saturated oxygen atmosphere at up to 1000/degree/C produces solid-phase epitaxial regrowth onto the crystalline substrate. A high-quality crystalline layer results which incorporates the Ti into the crystal structure at much higher concentrations than is possible by standard diffusion techniques, and this implanted region has excellent optical waveguiding properties.

Appleton, B.R.; Ashley, P.R.; Buchal, C.J.

1987-03-24T23:59:59.000Z

117

ParaView at NERSC  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

ParaView ParaView ParaView Introduction ParaView is an open-source, multi-platform data analysis and visualization application. ParaView users can quickly build visualizations to analyze their data using qualitative and quantitative techniques. The data exploration can be done interactively in 3D or programmatically using ParaView's batch processing capabilities. ParaView was developed to analyze extremely large datasets using distributed memory computing resources. It can be run on supercomputers to analyze datasets of terascale as well as on laptops for smaller data. Remote Visualization with ParaView ParaView is a client-server application. The ParaView client (or simply paraview) will run on your desktop while the server will run at the remote supercomputing site. The following describes the steps you will take to

118

Plasmonic waveguides based on symmetric and asymmetric T-shaped structures  

Science Journals Connector (OSTI)

We describe the fabrication and characterization of plasmonic waveguides based on a periodic one-dimensional array of symmetric and asymmetric T-shaped structures. The devices are...

Gupta, Barun; Pandey, Shashank; Nahata, Ajay

2014-01-01T23:59:59.000Z

119

Scattering of optical guided waves by waveguide surface roughness: a three-dimensional treatment  

Science Journals Connector (OSTI)

The scattering of optical guided waves by waveguide surface roughness has been analyzed in three dimensions. The scattered fields were determined by satisfying the boundary conditions...

Hall, D G

1981-01-01T23:59:59.000Z

120

The Spectrum of High-Frequency Internal Waves in the Atmospheric Waveguide  

Science Journals Connector (OSTI)

The vertical structure and power spectrum of the field of internal waves generated in the atmospheric waveguide by random vertical displacements were considered in this paper.

I. P. Chunchuzov

1996-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "nonlinear waveguides view" 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

Design and modelling of novel waveguide and light-emitting-diode-based photoreactors.  

E-Print Network [OSTI]

??In this dissertation, investigations on a range of photocatalytic reactors based on waveguides (optical fibres and quartz tubes) are presented. A study on a coupled… (more)

Denny, Frans

2010-01-01T23:59:59.000Z

122

Evanescent-wave coupled right angled buried waveguide: Applications in carbon nanotube mode-locking  

SciTech Connect (OSTI)

We present an evanescent-field device based on a right-angled waveguide. This consists of orthogonal waveguides, with their points of intersection lying along an angled facet of the chip. Light guided along one waveguide is incident at the angled dielectric-air facet at an angle exceeding the critical angle, so that the totally internally reflected light is coupled into the second waveguide. By depositing a nanotube film on the angled surface, the chip is then used to mode-lock an Erbium doped fiber ring laser with a repetition rate of 26?MHz, and pulse duration of 800?fs.

Mary, R.; Thomson, R. R.; Kar, A. K., E-mail: a.k.kar@hw.ac.uk [Institute of Photonics and Quantum Sciences, Heriot-Watt University, Edinburgh EH14 4AS (United Kingdom); Brown, G. [Optoscribe Ltd, 0/14 Alba Innovation Centre, Alba Campus, Livingston EH54 7GA (United Kingdom)] [Optoscribe Ltd, 0/14 Alba Innovation Centre, Alba Campus, Livingston EH54 7GA (United Kingdom); Beecher, S. J. [Optoelectronics Research Centre, University of Southampton, Southampton SO17 1BJ (United Kingdom)] [Optoelectronics Research Centre, University of Southampton, Southampton SO17 1BJ (United Kingdom); Popa, D.; Sun, Z.; Torrisi, F.; Hasan, T.; Milana, S.; Bonaccorso, F.; Ferrari, A. C. [Cambridge Graphene Centre, University of Cambridge, Cambridge CB3 0FA (United Kingdom)] [Cambridge Graphene Centre, University of Cambridge, Cambridge CB3 0FA (United Kingdom)

2013-11-25T23:59:59.000Z

123

Spontaneous Emission ß-factors in Photonic Crystal Waveguides: Towards Single-Mode LED  

Science Journals Connector (OSTI)

We theoretically study light emission in photonic crystal waveguides and show that remarkably large spontaneous emission rates into the fundamental guided mode (beta factor >95%)...

Lecamp, Guillaume; Sauvan, Christophe; Lalanne, Philippe; Hugonin, Jean-Paul

124

Gel-based optical waveguides with live cell encapsulation and integrated microfluidics  

Science Journals Connector (OSTI)

In this Letter, we demonstrate a biocompatible microscale optical device fabricated from agarose hydrogel that allows for encapsulation of cells inside an optical waveguide. This...

Jain, Aadhar; Yang, Allen H J; Erickson, David

2012-01-01T23:59:59.000Z

125

Agarose gel optical waveguides with encapsulation of live cells and integrated microfluidics  

Science Journals Connector (OSTI)

We demonstrate optical waveguides, with integrated microfluidics, fabricated out of agarose and capable of encapsulating live cells, thus allowing for the interaction of the direct...

Jain, Aadhar; Erickson, David

126

E-Print Network 3.0 - antenna waveguide plasma Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

antenna, the TTD... by trimming the non-dispersive waveguide. Thus, at o the main ... Source: Chen, Ray - Department of Electrical and Computer Engineering, University of Texas...

127

Enhancing Solar Energy Light Capture with Multi-Directional Waveguide Lattices  

Science Journals Connector (OSTI)

Multiple, intersecting lattices of multimode and polychromatic waveguides were fabricated in photopolymerizable media. The cumulative collection angle ranges of the lattices permits...

Hosein, Ian D; Lin, Hao; Ponte, Matthew R; Basker, Dinesh K; Saravanamuttu, Kalaichelvi

128

Nano plasmon polariton modes of a wedge cross section metal waveguide  

Science Journals Connector (OSTI)

Optical plasmon-polariton modes confined in both transverse dimensions to significantly less than a wavelength are exhibited in open waveguides structured as sharp metal wedges. The...

Feigenbaum, Eyal; Orenstein, Meir

2006-01-01T23:59:59.000Z

129

E-Print Network 3.0 - acoustic random waveguides Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

IN RANDOM JOSSELIN GARNIERAND GEORGE PAPANICOLAOU Summary: . Acoustic waveguides, random media, asymptotic analysis. AMS subject classifications. 76B15, 35Q99, 60F05. 1... PULSE...

130

Anharmonic Bloch Oscillations in the Optical Waveguide Array  

E-Print Network [OSTI]

The anharmonic Bloch oscillations of a light beam in the array of optical waveguides are considered. The coupling modes model (CMM) with the second order interaction is used to describe the effect analytically. The formula obtained predicts explicitly the path of the optical beam, in particular, the positions of the turning points are found. A total agreement of this formula with the numerical simulation is confirmed.

Gozman, M I; Kagan, Yu M; Pavlov, A I; Polishchuk, I Ya

2015-01-01T23:59:59.000Z

131

Computer Project # 1 Nonlinear Springs  

E-Print Network [OSTI]

Computer Project # 1. Nonlinear Springs. Goal: Investigate the behavior of nonlinear springs. Tools needed: ode45, plot routines. Description: Sometimes for ...

2005-08-19T23:59:59.000Z

132

Nonlinear Tides in Close Binary Systems  

Science Journals Connector (OSTI)

We study the excitation and damping of tides in close binary systems, accounting for the leading-order nonlinear corrections to linear tidal theory. These nonlinear corrections include two distinct physical effects: three-mode nonlinear interactions, i.e., the redistribution of energy among stellar modes of oscillation, and nonlinear excitation of stellar normal modes by the time-varying gravitational potential of the companion. This paper, the first in a series, presents the formalism for studying nonlinear tides and studies the nonlinear stability of the linear tidal flow. Although the formalism we present is applicable to binaries containing stars, planets, and/or compact objects, we focus on non-rotating solar-type stars with stellar or planetary companions. Our primary results include the following: (1) The linear tidal solution almost universally used in studies of binary evolution is unstable over much of the parameter space in which it is employed. More specifically, resonantly excited internal gravity waves in solar-type stars are nonlinearly unstable to parametric resonance for companion masses M' 10-100 M ? at orbital periods P ? 1-10 days. The nearly static "equilibrium" tidal distortion is, however, stable to parametric resonance except for solar binaries with P 2-5 days. (2) For companion masses larger than a few Jupiter masses, the dynamical tide causes short length scale waves to grow so rapidly that they must be treated as traveling waves, rather than standing waves. (3) We show that the global three-wave treatment of parametric instability typically used in the astrophysics literature does not yield the fastest-growing daughter modes or instability threshold in many cases. We find a form of parametric instability in which a single parent wave excites a very large number of daughter waves (N ? 103[P/10 days] for a solar-type star) and drives them as a single coherent unit with growth rates that are a factor of ?N faster than the standard three-wave parametric instability. These are local instabilities viewed through the lens of global analysis; the coherent global growth rate follows local rates in the regions where the shear is strongest. In solar-type stars, the dynamical tide is unstable to this collective version of the parametric instability for even sub-Jupiter companion masses with P a month. (4) Independent of the parametric instability, the dynamical and equilibrium tides excite a wide range of stellar p-modes and g-modes by nonlinear inhomogeneous forcing; this coupling appears particularly efficient at draining energy out of the dynamical tide and may be more important than either wave breaking or parametric resonance at determining the nonlinear dissipation of the dynamical tide.

Nevin N. Weinberg; Phil Arras; Eliot Quataert; Josh Burkart

2012-01-01T23:59:59.000Z

133

Integrated optics and new wave phenomena in optical waveguides  

Science Journals Connector (OSTI)

Research in integrated optics has two goals: One is to apply thin-film technology to the formation of optical devices and circuits. The other is the integration of a large number of optical devices on a small substrate, so forming an optical circuit reminiscent of the integrated circuit in microelectronics. The result is a new breed of optical devices in the form of miniature optical waveguides. They include lasers, modulators, switches, detectors, prisms, lenses, and polarizers, and many of them have efficiencies better than their bulk counterparts. Simple integrated optical circuits have also been constructed, and rapidly advancing semiconductor technology indicates that monolithic integrated optical circuits can readily be developed using GaAs-related compounds. In this paper, we review the state-of-the-art of integrated optics and explore new wave phenomena in optical circuits. The specific topics to be discussed are: light-wave couplers and m-line spectroscopy, refraction and reflection of light in thin films, normal modes of the uniform, the graded and the metal-clad waveguides, optics in tapered films, theory of corrugated waveguides, and more importantly, physics of various thin-film optical devices and the method of the circuit formation.

P. K. Tien

1977-04-01T23:59:59.000Z

134

Dissipative Nonlinear Josephson Junction of Optical Soliton and Surface Plasmon  

E-Print Network [OSTI]

We examine the dynamics of a dissipative photonic Josephson junction formed by the weak coupling of an optical soliton in a nonlinear dielectric waveguide and a co-propagating surface plasmon along a parallel metal surface with a linear dielectric spacer. We employ a heuristic model with a coupling function that depends on the soliton amplitude, and consider two phenomenological dissipation mechanisms separately: angular velocity dissipation and population imbalance dissipation. In the former dissipation mechanism, the system exhibits phase-slip phenomenon where the odd-\\pi phase modes decay into even-\\pi phase modes. The latter damping mechanism sculptures the phase-space significantly by introducing complex features, among which Hopf type bifurcations are notable. We show that some of the bifurcation points expand to stable limit cycles for certain regimes of the model parameters.

Ek?io?lu, Yasa; Güven, Kaan

2012-01-01T23:59:59.000Z

135

Stereoscopic optical viewing system  

DOE Patents [OSTI]

An improved optical system which provides the operator with a stereoscopic viewing field and depth of vision, particularly suitable for use in various machines such as electron or laser beam welding and drilling machines. The system features two separate but independently controlled optical viewing assemblies from the eyepiece to a spot directly above the working surface. Each optical assembly comprises a combination of eye pieces, turning prisms, telephoto lenses for providing magnification, achromatic imaging relay lenses and final stage pentagonal turning prisms. Adjustment for variations in distance from the turning prisms to the workpiece, necessitated by varying part sizes and configurations and by the operator's visual accuity, is provided separately for each optical assembly by means of separate manual controls at the operator console or within easy reach of the operator.

Tallman, C.S.

1986-05-02T23:59:59.000Z

136

Exploring Nonlinear Behavior  

Science Journals Connector (OSTI)

The point at which modeling gets particularly interesting is when model behavior becomes increasingly nonlinear. It is no coincidence that this is the point where simulation tools start having trouble. Nonline...

Michael Tiller Ph.D.

2001-01-01T23:59:59.000Z

137

Nonlinear Xenon Oscillations  

Science Journals Connector (OSTI)

Space-independent xenon oscillations are linearly unstable at high neutron flux, ... coefficient is too small. These linearly unstable oscillations typically develop into stable limit cycles when nonlinear neutro...

David L. Hetrick

1989-01-01T23:59:59.000Z

138

Nonlinear optomechanical pressure  

E-Print Network [OSTI]

A transparent material exhibits ultra-fast optical nonlinearity and is subject to optical pressure if irradiated by a laser beam. However, the effect of nonlinearity on optical pressure is often overlooked, even if a nonlinear optical pressure may be potentially employed in many applications, as optical manipulation, biophysics, cavity optomechanics, quantum optics, optical tractors, and is relevant in fundamental problems as the Abraham-Minkoswky dilemma, or the Casimir effect. Here we show that an ultra-fast nonlinear polarization gives indeed a contribution to the optical pressure that also is negative in certain spectral ranges; the theoretical analysis is confirmed by first-principles simulations. An order of magnitude estimate shows that the effect can be observable by measuring the deflection of a membrane made by graphene.

Claudio Conti; Robert Boyd

2014-03-08T23:59:59.000Z

139

Design of Multilayered Substrate-Integrated Waveguide Cross-Slot Couplers  

E-Print Network [OSTI]

Design of Multilayered Substrate-Integrated Waveguide Cross-Slot Couplers Vladimir A. Labay1 , Jens directional coupler designs in substrate-integrated waveguide (SIW) technology. Interface ports are modeled. Several Ka-band double- or triple-layered cross-guide coupler designs are presented using an Ansoft's HFSS

Bornemann, Jens

140

Arrays and Cascades of Fluorescent Liquid-Liquid Waveguides: Broadband Light Sources for  

E-Print Network [OSTI]

Arrays and Cascades of Fluorescent Liquid-Liquid Waveguides: Broadband Light Sources) microchannel waveguides with liquid cores containing fluorescent dyes, excited by incident light from an external halogen bulb. Simultaneous use of multiple fluorophores in a common solution, in a single L2 light

Prentiss, Mara

Note: This page contains sample records for the topic "nonlinear waveguides view" 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

Deposition and characterization of metal sulfide dielectric coatings for hollow glass waveguides  

E-Print Network [OSTI]

by chemical bath deposition for solar energy related applications," Solar Energy Materials and Solar Cells 52 coatings for Ag/dielectric hollow glass waveguides," in Optical Fibers and Sensors for Medical Applications for hollow glass waveguides," in Optical Fibers and Sensors for Medical Applications III, Proc. SPIE 4957, 97

142

Efficient generation of extended plasma waveguides with the axicon ignitor-heater scheme  

E-Print Network [OSTI]

. The plasma col- umn was produced by using an axicon to focus a long laser pulse into a line focusEfficient generation of extended plasma waveguides with the axicon ignitor-heater scheme Y.-F. Xiao for generating extended plasma waveguides is developed by using the axicon lens in conjunction with the ignitor

143

The View from HQ  

National Nuclear Security Administration (NNSA)

A publication of the Office of Advanced Simulation & Computing, NNSA Defense Programs A publication of the Office of Advanced Simulation & Computing, NNSA Defense Programs NA-ASC-500-07-Issue 3 May 2007 The View from HQ by Dimitri Kusnezov I have been spending much of my time these days thinking about science, technology and engineering and the role of the laboratories and how that will be reflected in the Complex of the future. This is on my mind for two reasons: one is my responsibility to

144

NUPlans Budgeting Grant Input View  

E-Print Network [OSTI]

NUPlans Budgeting Grant Input View FMS704 NUPlansGrantInputViewV2 Last updated 4/7/2014 - rb © 2014 Northwestern University FMS704 NUPlans Contributor Budgeting 1 of 5 NUPlans Grant Input View NUPlans enables schools and units with grant projects to input grant expense estimates per project for the next fiscal

Shull, Kenneth R.

145

Optical waveguide solar energy system for lunar material processing  

SciTech Connect (OSTI)

This paper summarizes the study on the optical waveguide (OW) solar energy system for lunar material processing. In the OW solar energy system, solar radiation is collected by the concentrator which transfers the concentrated solar radiation to the OW transmission line consisting of low-loss optical fibers and related optical components. The OW line transmits the high intensity solar radiation to the thermal reactor of the lunar materials processing plant. Based on the results discussed in this paper the authors conclude that the OW solar energy system is a viable concept which can effectively utilize solar energy for lunar material processing.

Nakamura, T.; Senior, C.L. [Physical Sciences, Inc., Andover, MA (United States); Shoji, J.M.; Waldron, R.D. [Rockwell International Corp., Canoga Park, CA (United States). Rocketdyne Division

1995-11-01T23:59:59.000Z

146

Optical waveguides in SBN by zinc vapor diffusion  

E-Print Network [OSTI]

at 600'C for a 12. 5 i1m Wide 1000'C Zinc Vapor Diffused SBN:60 Waveguide Measured at X = 0. 81 pm. IV. SBN:60 Amplitude Modulator Results . . . . . V. SBN:60 Mach-Zehnder Interferometer Results. . . . VI. Voltage-Length Product Comparison...: (a) extraordinary (TM), (b) 1. 5 x ordinary (TE). 12. Surface damage on SBN:60 diffused at 1000'C with an SiOz diffusion mask. 13. Zinc in-diffusion in SBN:60 25 . . . . . 26 . . . . . 27 . . . . . 28 29 14. Barium out-diffuison in SBN:60...

Quinn, Jeffrey Dale

1991-01-01T23:59:59.000Z

147

Temporal Coherence of Normal Modes in an Ocean Waveguide  

Science Journals Connector (OSTI)

The coherence time of acoustic signals is derived using coupled mode equation to the first order of sound speed perturbation squared. It is found that mode coupling induced by internal waves in a waveguide changes the temporal coherence of the acoustic field. For a typical shallow water environment numerical results show that the coherence time of acoustic field decreases as ?3/2 power of frequency and ?1/2 power of range at high frequencies in accord with experimental data. Ignoring the mode coupling the coherence time of acoustic field decreases as ?1 power of frequency and ?1/2 power of range same as that predicted for acoustic rays.

T. C. Yang

2010-01-01T23:59:59.000Z

148

Protective laser beam viewing device  

DOE Patents [OSTI]

A protective laser beam viewing system or device including a camera selectively sensitive to laser light wavelengths and a viewing screen receiving images from the laser sensitive camera. According to a preferred embodiment of the invention, the camera is worn on the head of the user or incorporated into a goggle-type viewing display so that it is always aimed at the area of viewing interest to the user and the viewing screen is incorporated into a video display worn as goggles over the eyes of the user.

Neil, George R.; Jordan, Kevin Carl

2012-12-18T23:59:59.000Z

149

Visualization of high-dimensional clusters using nonlinear magnification  

SciTech Connect (OSTI)

This paper describes a cluster visualization system used for data-mining fraud detection. The system can simultaneously show 6 dimensions of data, and a unique technique of 3D nonlinear magnification allows individual clusters of data points to be magnified while still maintaining a view of the global context. The author first describes the fraud detection problem, along with the data which is to be visualized. Then he describes general characteristics of the visualization system, and shows how nonlinear magnification can be used in this system. Finally he concludes and describes options for further work.

Keahey, T.A.

1998-12-31T23:59:59.000Z

150

The View from HQ  

National Nuclear Security Administration (NNSA)

  NA-ASC-500-07 Issue 2 January 2007 The View from HQ Sitting in airports and planes is risky beyond the obvious dangers now in the news. Uninter- rupted time to think may lead to new ideas. Instinct instructs us that when we hear Wash- ington has some new ideas, the result must be bad. After all, ideas suggest change, which is inherently disruptive. Today the notion of predictivity is on my mind as I am leaving the V&V 2007 meeting in Los Alamos. Predictivity is on my short list of overused, ill-defined words. Washington main- tains a full lexicon of such words-a fair number of which find their way into common usage.

151

False color viewing device  

DOE Patents [OSTI]

This invention consists of a viewing device for observing objects in near-infrared false-color comprising a pair of goggles with one or more filters in the apertures, and pads that engage the face for blocking stray light from the sides so that all light reaching, the user`s eyes come through the filters. The filters attenuate most visible light and pass near-infrared (having wavelengths longer than approximately 700 nm) and a small amount of blue-green and blue-violet (having wavelengths in the 500 to 520 nm and shorter than 435 nm, respectively). The goggles are useful for looking at vegetation to identify different species and for determining the health of the vegetation, and to detect some forms of camouflage.

Kronberg, J.W.

1991-05-08T23:59:59.000Z

152

Methods and apparatus for vertical coupling from dielectric waveguides  

SciTech Connect (OSTI)

A frequency-chirped nano-antenna provides efficient sub-wavelength vertical emission from a dielectric waveguide. In one example, this nano-antenna includes a set of plasmonic dipoles on the opposite side of a SiYV.sub.4 waveguide from a ground plane. The resulting structure, which is less than half a wavelength long, emits a broadband beam (e.g., >300 nm) that can be coupled into an optical fiber. In some embodiments, a diffractive optical element with unevenly shaped regions of high- and low-index dielectric material collimates the broadband beam for higher coupling efficiency. In some cases, a negative lens element between the nano-antenna and the diffractive optical element accelerates the emitted beam's divergence (and improves coupling efficiency), allowing for more compact packaging. Like the diffractive optical element, the negative lens element includes unevenly shaped regions of high- and low-index dielectric material that can be designed to compensate for aberrations in the beam emitted by the nano-antenna.

Yaacobi, Ami; Cordova, Brad Gilbert

2014-06-17T23:59:59.000Z

153

Slow wave structures using twisted waveguides for charged particle applications  

DOE Patents [OSTI]

A rapidly twisted electromagnetic accelerating structure includes a waveguide body having a central axis, one or more helical channels defined by the body and disposed around a substantially linear central axial channel, with central portions of the helical channels merging with the linear central axial channel. The structure propagates electromagnetic waves in the helical channels which support particle beam acceleration in the central axial channel at a phase velocity equal to or slower than the speed of light in free space. Since there is no variation in the shape of the transversal cross-section along the axis of the structure, inexpensive mechanical fabrication processes can be used to form the structure, such as extrusion, casting or injection molding. Also, because the field and frequency of the resonant mode depend on the whole structure rather than on dimensional tolerances of individual cells, no tuning of individual cells is needed. Accordingly, the overall operating frequency may be varied with a tuning/phase shifting device located outside the resonant waveguide structure.

Kang, Yoon W.; Fathy, Aly E.; Wilson, Joshua L.

2012-12-11T23:59:59.000Z

154

Optical properties of wide single-mode strip and grating loaded channel waveguides  

SciTech Connect (OSTI)

New wide single-mode strip and grating loaded (SGL) channel waveguides made of silicon nitride on the oxide buffer layer of a planar silicon-on-insulator waveguide are studied. The central 10-lm-wide strip produces a multi-mode channel waveguide and diffraction gratings with a period 0.6 lm built on the structure edges produce mode-dependent additional losses due to radiation to the surrounding medium. The optical properties of these waveguides are discussed using the results of a three-dimensional numerical simulation by the FDTD and BPM methods. It is shown that a wide SGL waveguide is quasi-single-mode one because it has a small propagation loss ({approx} 0.3 dB cm{sup -1}) for the fundamental mode and a high (up to -20 dB cm{sup -1}) loss for the higher order modes. The new SGL waveguides are CMOS compatible and can become basic for fabricating new photonic elements, including tunable optical filters and multi-plexers based on the multireflector technology. (waveguides)

Tsarev, Andrei V [Rzhanov Institute of Semiconductor Physics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk (Russian Federation)

2009-12-31T23:59:59.000Z

155

The Nonlinear Equatorial Kelvin Wave  

Science Journals Connector (OSTI)

Using the method of strained coordinates, a uniformly valid approximation to the nonlinear equatorial Kelvin wave is derived. It is shown that nonlinear effects are negligible for the Kelvin waves associated with the Gulf of Guinea upwelling. The ...

John P. Boyd

1980-01-01T23:59:59.000Z

156

Dimension-sensitive optical responses of electromagnetically induced transparency vapor in a waveguide  

Science Journals Connector (OSTI)

A three-level EIT (electromagnetically induced transparency) vapor is used to manipulate the transparency and absorption properties of the probe light in a waveguide. The most remarkable feature of the present scheme is such that the optical responses resulting from both electromagnetically induced transparency and large spontaneous emission enhancement are very sensitive to the frequency detunings of the probe light as well as to the small changes of the waveguide dimension. The potential applications of the dimension- and dispersion-sensitive EIT responses are discussed, and the sensitivity limits of some waveguide-based sensors, including electric absorption modulator, optical switch, wavelength sensor, and sensitive magnetometer, are analyzed.

Jian Qi Shen and Sailing He

2006-12-28T23:59:59.000Z

157

Optical characterization of femtosecond laser induced active channel waveguides in lithium fluoride crystals  

SciTech Connect (OSTI)

We successfully realized broad-band light-emitting color center waveguides buried in LiF crystals by using femtosecond laser pulses. The characterization of the waveguides was performed by optical microscopy, photoluminescence spectra, loss measurements and near-field profiling. The experimental results show that the direct-writing fabrication process induces low-index contrast active channel waveguides: their wavelength-dependent refractive index changes, estimated from 10{sup ?3} to 10{sup ?4} depending on the writing conditions, allow supporting few modes at visible and near-infrared wavelengths.

Chiamenti, I.; Kalinowski, H. J., E-mail: hjkalin@utfpr.edu.br [Federal University of Technology–Paraná, Photonics Laboratory, 80230-901 Curitiba (Brazil); Bonfigli, F.; Montereali, R. M. [ENEA C.R. Frascati, Photonics Micro and Nanostructures Laboratory, V. E. Fermi, 45, 00044 Frascati (RM) (Italy); Gomes, A. S. L. [Universidade Federal de Pernambuco, Department of Physics, 50740-560 Recife (Brazil); Michelotti, F. [Universitá degli Studi di Roma “La Sapienza,” Dipartimento di Scienze di Base e Applicate per l'Ingegneria, Via A. Scarpa, 16, 00161, Rome (Italy)

2014-01-14T23:59:59.000Z

158

Intramolecular and nonlinear dynamics  

SciTech Connect (OSTI)

Research in this program focuses on three interconnected areas. The first involves the study of intramolecular dynamics, particularly of highly excited systems. The second area involves the use of nonlinear dynamics as a tool for the study of molecular dynamics and complex kinetics. The third area is the study of the classical/quantum correspondence for highly excited systems, particularly systems exhibiting classical chaos.

Davis, M.J. [Argonne National Laboratory, IL (United States)

1993-12-01T23:59:59.000Z

159

Nonlinear optics at maximum coherence  

Science Journals Connector (OSTI)

...D. Walls Nonlinear optics at maximum coherence S. E. Harris G. Y. Yin M. Jain H...optical processes which utilize maximum coherence of a non-allowed transition. The nonlinear...frequency. Nonlinear optics at maximum coherence B y S. E. Harris, G. Y. Yin, M...

1997-01-01T23:59:59.000Z

160

Experimental determination of the neutron channeling length in a planar waveguide  

SciTech Connect (OSTI)

In neutron waveguides, the neutron wave is confined inside the guiding layer of the structure and can escape from the layer edge as a microbeam. The channeling within the guiding layer is accompanied by an exponential decay of the neutron wave function density inside the waveguide. Here, we report direct determination of the corresponding decay constant, termed the neutron channeling length. For this, we measured the microbeam intensity as a function of the length of a neutron absorbing layer of variable length placed onto the surface of a waveguide structure. Such planar neutron waveguides transform a conventional neutron beam into an extremely narrow but slightly divergent microbeam, which can be used for the investigation of nanostructures with submicron spatial resolution.

Kozhevnikov, S. V., E-mail: kozhevn@nf.jinr.ru; Ignatovich, V. K., E-mail: ignatovi@nf.jinr.ru [Joint Institute for Nuclear Research (Russian Federation); Ott, F. [CEA, Iramis, Laboratoire Leon Brillouin Gif sur Yvette (France)] [CEA, Iramis, Laboratoire Leon Brillouin Gif sur Yvette (France); Ruehm, A.; Major, J. [Max-Planck-Institut fuer Intelligente Systeme (formerly Max-Planck-Institut fuer Metallforschung) (Germany)] [Max-Planck-Institut fuer Intelligente Systeme (formerly Max-Planck-Institut fuer Metallforschung) (Germany)

2013-10-15T23:59:59.000Z

Note: This page contains sample records for the topic "nonlinear waveguides view" 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

Fabrication of buried channel waveguides in photosensitive glass using proton beam writing  

SciTech Connect (OSTI)

We report our results on the fabrication and characterization of buried, channel optical waveguides in photosensitive Foturan{sup TM} glass using a high energy proton beam. Waveguides were fabricated with varying fluence, and the propagation loss and refractive index change were measured. Near-field mode data measured at 632.8 nm showed that waveguiding could be achieved for all fluences ranging from 10{sup 14} to 10{sup 16} protons/cm{sup 2}. The maximum positive refractive index change of 1.6x10{sup -3} was measured for the highest fluence. The waveguide propagation losses measured using the scattering technique were estimated to be in the range of 8.3-12.9 dB/cm, increasing with proton fluence.

Bettiol, A.A.; Venugopal Rao, S.; Teo, E.J.; Kan, J.A. van; Watt, Frank [Centre for Ion Beam Applications, Department of Physics, National University of Singapore, 2 Science Dr 3, Singapore 117542 (Singapore); Department of Physics, Indian Institute of Technology Guwahati, Guwahati 781039, Assam (India); Department of Materials Science and Engineering, National University of Singapore, 9 Engineering Dr 1, Singapore 117576 (Singapore); Centre for Ion Beam Applications, Department of Physics, National University of Singapore, 2 Science Dr 3, Singapore 117542 (Singapore)

2006-04-24T23:59:59.000Z

162

Data transmission in long-range dielectric-loaded surface plasmon polariton waveguides  

Science Journals Connector (OSTI)

We demonstrate the data transmission of 10 Gbit/s on-off keying modulated 1550 nm signal through a long-range dielectric-loaded surface plasmon polariton waveguide structure with...

Kharitonov, Svyatoslav; Kiselev, Roman; Kumar, Ashwani; de Jáuregui Ruiz, Ivan Fernández; Shi, Xueliang; Leósson, Kristján; Pertsch, Thomas; Nolte, Stefan; Bozhevolnyi, Sergey; Chipouline, Arkadi

2014-01-01T23:59:59.000Z

163

Tunable Substrate Integrated Waveguide Filters Implemented with PIN Diodes and RF MEMS Switches  

E-Print Network [OSTI]

This thesis presents the first fully tunable substrate integrated waveguide (SIW) filter implemented with PIN diodes and RF MEMS switches. The methodology for tuning SIW filters is explained in detail and is used to create three separate designs...

Armendariz, Marcelino

2012-02-14T23:59:59.000Z

164

Bandwidth Studies on a 1.4 m Long Multimode Polymer Spiral Waveguide  

E-Print Network [OSTI]

to electromagnetic interference and compactness. Polymer multimode waveguides are potential candidates for use in on-board optical interconnections owing to favourable material properties which show low optical losses even at the high temperatures (> 250 °C...

Chen, Jian; Bamiedakis, Nikos; Penty, Richard V.; White, Ian H.

2014-07-03T23:59:59.000Z

165

Oscillations of a Magnetized Plasma in a Waveguide of Complicated Shape  

SciTech Connect (OSTI)

Potential hybrid oscillations in a resonator of arbitrary shape are investigated theoretically. It is shown that, for a periodic waveguide, the frequency dependence of the wavenumber is represented by a fractal curve of the 'devil's staircase' type.

Ignatov, A. M. [Russian Academy of Sciences, Institute of General Physics (Russian Federation)] [Russian Academy of Sciences, Institute of General Physics (Russian Federation)

2002-07-15T23:59:59.000Z

166

Efficient localization in a dispersive waveguide : applications in terrestrial continental shelves and on Europa  

E-Print Network [OSTI]

Methods are developed for passive source localization and environmental parameter estimation in seismo-acoustic waveguides by exploiting the dispersive behavior of guided wave propagation. The methods developed are applied ...

Lee, Sunwoong

2006-01-01T23:59:59.000Z

167

Silicon-germanium saturable absorbers and erbium-doped waveguides for integrated mode-locked lasers  

E-Print Network [OSTI]

In this thesis, Silicon-Germanium (SiGe) Saturable Bragg Reflectors (SBR) and Erbium-doped waveguide chips are fabricated and characterized as crucial components for integration of a mode-locked laser on a Si-chip. The ...

Byun, Hyunil

2006-01-01T23:59:59.000Z

168

E-Print Network 3.0 - all-dielectric hollow waveguide Sample...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

with inner Cu coatings K. Wang and D. M... demonstrate a new waveguiding structure for terahertz (THz) radiation in which broadband THz pulses... are confined and guided along a...

169

Optical realization of the two-site Bose-Hubbard model in waveguide lattices  

E-Print Network [OSTI]

A classical realization of the two-site Bose-Hubbard Hamiltonian, based on light transport in engineered optical waveguide lattices, is theoretically proposed. The optical lattice enables a direct visualization of the Bose-Hubbard dynamics in Fock space.

Stefano Longhi

2011-01-25T23:59:59.000Z

170

Optical loss reduction in HIC chalcogenide glass waveguides via thermal reflow  

E-Print Network [OSTI]

A rapid thermal reflow technique is applied to high-index-contrast, sub-micron waveguides in As[subscript 2]S[subscript 3] chalcogenide glass to reduce sidewall roughness and associated optical scattering loss. Up to 50% ...

Hu, Juejun

171

Push-pull radio frequency circuit with integral transistion to waveguide output  

DOE Patents [OSTI]

A radio frequency circuit for ICRF heating includes a resonant push-pull circuit, a double ridged rectangular waveguide, and a coupling transition which joins the waveguide to the resonant circuit. The resonant circuit includes two cylindrical conductors mounted side by side and two power vacuum tubes attached to respective ends of a cylindrical conductor. A conductive yoke is located at the other end of the cylindrical conductors to short circuit the two cylindrical conductors. The coupling transition includes two relatively flat rectangular conductors extending perpendicular to the longitudinal axes of a respective cylindrical conductor to which the flat conductor is attached intermediate the ends thereof. Conductive side covers and end covers are also provided for forming pockets in the waveguide into which the flat conductors extend when the waveguide is attached to a shielding enclosure surrounding the resonant circuit.

Bennett, Wilfred P. (21 Catskill Ct., Belle Mead, NJ 08502)

1987-01-01T23:59:59.000Z

172

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

173

Application of Plasma Waveguides to High Energy Accelerators  

SciTech Connect (OSTI)

The eventual success of laser-plasma based acceleration schemes for high-energy particle physics will require the focusing and stable guiding of short intense laser pulses in reproducible plasma channels. For this goal to be realized, many scientific issues need to be addressed. These issues include an understanding of the basic physics of, and an exploration of various schemes for, plasma channel formation. In addition, the coupling of intense laser pulses to these channels and the stable propagation of pulses in the channels require study. Finally, new theoretical and computational tools need to be developed to aid in the design and analysis of experiments and future accelerators. Here we propose a 3-year renewal of our combined theoretical and experimental program on the applications of plasma waveguides to high-energy accelerators. During the past grant period we have made a number of significant advances in the science of laser-plasma based acceleration. We pioneered the development of clustered gases as a new highly efficient medium for plasma channel formation. Our contributions here include theoretical and experimental studies of the physics of cluster ionization, heating, explosion, and channel formation. We have demonstrated for the first time the generation of and guiding in a corrugated plasma waveguide. The fine structure demonstrated in these guides is only possible with cluster jet heating by lasers. The corrugated guide is a slow wave structure operable at arbitrarily high laser intensities, allowing direct laser acceleration, a process we have explored in detail with simulations. The development of these guides opens the possibility of direct laser acceleration, a true miniature analogue of the SLAC RF-based accelerator. Our theoretical studies during this period have also contributed to the further development of the simulation codes, Wake and QuickPIC, which can be used for both laser driven and beam driven plasma based acceleration schemes. We will continue our development of advanced simulation tools by modifying the QuickPIC algorithm to allow for the simulation of plasma particle pick-up by the wake fields. We have also performed extensive simulations of plasma slow wave structures for efficient THz generation by guided laser beams or accelerated electron beams. We will pursue experimental studies of direct laser acceleration, and THz generation by two methods, ponderomotive-induced THz polarization, and THz radiation by laser accelerated electron beams. We also plan to study both conventional and corrugated plasma channels using our new 30 TW in our new lab facilities. We will investigate production of very long hydrogen plasma waveguides (5 cm). We will study guiding at increasing power levels through the onset of laser-induced cavitation (bubble regime) to assess the role played by the preformed channel. Experiments in direct acceleration will be performed, using laser plasma wakefields as the electron injector. Finally, we will use 2-colour ionization of gases as a high frequency THz source (<60 THz) in order for femtosecond measurements of low plasma densities in waveguides and beams.

Milchberg, Howard M

2013-03-30T23:59:59.000Z

174

Physics of vertically integrated waveguide photodetectors and amplifiers. Final report  

SciTech Connect (OSTI)

This report describes the efforts supported by LLNL under the Subcontract No. B239593 at the University of Arizona during the Fiscal Year 1992. A solid physical foundation has been developed for understanding the operation of vertically integrated photodetectors and amplifiers. This has been achieved through a combination of numerical simulation and development of simple coupled-mode theories. Coupled-mode theory has been used to elucidate the physics underlying the operation of vertically integrated photodetectors. In particular, the relation between the spatial transients observed in experiments and numerical simulations, and the non-power orthogonality of the underlying modes has been clarified. The coupled-mode theory has been extended to the case of coupled waveguide-amplifiers.

Wright, E.M. [Univ. of Arizona, Tucson, AZ (United States). Optical Sciences Center

1993-11-01T23:59:59.000Z

175

Subwavelength edge detection through trapped resonances in waveguides  

E-Print Network [OSTI]

Lenses that can collect the perfect image of an object must restore propagative and evanescent waves. However, for efficient information transfer, e.g., in compressed sensing, it is often desirable to detect only the fast spatial variations of the wave field (carried by evanescent waves), as the one created by edges or small details. Image processing edge detection algorithms perform such operation but they add time and complexity to the imaging process. Here, we present a new subwavelength approach that generates an image of only those components of the acoustic field that are equal to or smaller than the operating wavelength. The proposed technique converts evanescent waves into propagative waves exciting trapped resonances in a waveguide, and it uses periodicity to attenuate the propagative components. This approach achieves resolutions about an order of magnitude smaller than the operating wavelength and makes it possible to visualize independently edges aligned along different directions.

Molerón, Miguel

2015-01-01T23:59:59.000Z

176

Calculations of modal characteristics of dielectric slab waveguides by a hybrid method  

E-Print Network [OSTI]

CALCULATIONS OF MODAL CHARACTERISTICS OF DIELECTRIC SLAB WAVEGUIDES BY A HYBRID METHOD A Thesis by EDDIE TZE-CHUN WONG Submitted to the Graduate College of Texas ARM University in partial fulfillment of the requirement for the degree... of MASTER OF SCIENCE August 1985 Major Subject: Electrical Engineering CALCULATIONS OF MODAL CHARACTERISTICS OF DIELECTRIC SLAB WAVEGUIDES BY A HYBRID METHOD A Thesis by EDDIE TZE-CHUN WONG Approved as to style and content by: A. K. Chan (Chairman...

Wong, Eddie Tze-Chung

2012-06-07T23:59:59.000Z

177

NONLINEAR TIDES IN CLOSE BINARY SYSTEMS  

SciTech Connect (OSTI)

We study the excitation and damping of tides in close binary systems, accounting for the leading-order nonlinear corrections to linear tidal theory. These nonlinear corrections include two distinct physical effects: three-mode nonlinear interactions, i.e., the redistribution of energy among stellar modes of oscillation, and nonlinear excitation of stellar normal modes by the time-varying gravitational potential of the companion. This paper, the first in a series, presents the formalism for studying nonlinear tides and studies the nonlinear stability of the linear tidal flow. Although the formalism we present is applicable to binaries containing stars, planets, and/or compact objects, we focus on non-rotating solar-type stars with stellar or planetary companions. Our primary results include the following: (1) The linear tidal solution almost universally used in studies of binary evolution is unstable over much of the parameter space in which it is employed. More specifically, resonantly excited internal gravity waves in solar-type stars are nonlinearly unstable to parametric resonance for companion masses M' {approx}> 10-100 M{sub Circled-Plus} at orbital periods P Almost-Equal-To 1-10 days. The nearly static 'equilibrium' tidal distortion is, however, stable to parametric resonance except for solar binaries with P {approx}< 2-5 days. (2) For companion masses larger than a few Jupiter masses, the dynamical tide causes short length scale waves to grow so rapidly that they must be treated as traveling waves, rather than standing waves. (3) We show that the global three-wave treatment of parametric instability typically used in the astrophysics literature does not yield the fastest-growing daughter modes or instability threshold in many cases. We find a form of parametric instability in which a single parent wave excites a very large number of daughter waves (N Almost-Equal-To 10{sup 3}[P/10 days] for a solar-type star) and drives them as a single coherent unit with growth rates that are a factor of Almost-Equal-To N faster than the standard three-wave parametric instability. These are local instabilities viewed through the lens of global analysis; the coherent global growth rate follows local rates in the regions where the shear is strongest. In solar-type stars, the dynamical tide is unstable to this collective version of the parametric instability for even sub-Jupiter companion masses with P {approx}< a month. (4) Independent of the parametric instability, the dynamical and equilibrium tides excite a wide range of stellar p-modes and g-modes by nonlinear inhomogeneous forcing; this coupling appears particularly efficient at draining energy out of the dynamical tide and may be more important than either wave breaking or parametric resonance at determining the nonlinear dissipation of the dynamical tide.

Weinberg, Nevin N. [Department of Physics, and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139 (United States); Arras, Phil [Department of Astronomy, University of Virginia, P.O. Box 400325, Charlottesville, VA 22904-4325 (United States); Quataert, Eliot; Burkart, Josh, E-mail: nevin@mit.edu [Astronomy Department and Theoretical Astrophysics Center, 601 Campbell Hall, University of California, Berkeley, CA 94720 (United States)

2012-06-01T23:59:59.000Z

178

Giant Enhancement of Stimulated Brillouin Scattering in the Subwavelength Limit  

E-Print Network [OSTI]

Stimulated Brillouin scattering (SBS) is traditionally viewed as a process whose strength is dictated by intrinsic material nonlinearities with little dependence on waveguide geometry. We show that this paradigm breaks ...

Rakich, Peter T.

179

Nonlinear magnetization of graphene  

Science Journals Connector (OSTI)

We compute the magnetization of graphene in a magnetic field, taking into account for generality the possibility of a mass gap. We concentrate on the physical regime where quantum oscillations are not observed due to the effect of the temperature or disorder and show that the magnetization exhibits nonlinear behavior as a function of the applied field, reflecting the strong nonanalyticity of the two-dimensional effective action of Dirac electrons. The necessary values of the magnetic field to observe this nonlinearity vary from a few teslas for very clean suspended samples to 20–30 T for good samples on substrate. In the light of these calculations, we discuss the effects of disorder and interactions as well as the experimental conditions under which the predictions can be observed.

Sergey Slizovskiy and Joseph J. Betouras

2012-09-24T23:59:59.000Z

180

Chiral nanophotonic waveguide interface based on spin-orbit coupling of light  

E-Print Network [OSTI]

Controlling the flow of light by means of nanophotonic waveguides has the potential of transforming integrated information processing much in the same way that conventional glass fibers have revolutionized global communication. Owing to the strong transverse confinement of the light, such waveguides give rise to a coupling between the internal spin of the guided photons and their orbital angular momentum. Here, we employ this spin-orbit coupling of light to break the mirror symmetry of the scattering of light by a single gold nanoparticle on the surface of a nanophotonic waveguide. We thereby realize a chiral waveguide coupler in which the handedness of the incident light determines the direction of propagation in the waveguide. Using this effect, we control the directionality of the scattering process and direct up to 94% of the incoupled light into a given direction. This enables novel ways for controlling and manipulating light in optical waveguides and nanophotonic structures as well as for the design of integrated optical sensors.

Jan Petersen; Jürgen Volz; Arno Rauschenbeutel

2014-06-09T23:59:59.000Z

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While these samples are representative of the content of NLEBeta,
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181

Nonlinear Noise in Cosmology  

E-Print Network [OSTI]

This paper derives and analyzes exact, nonlocal Langevin equations appropriate in a cosmological setting to describe the interaction of some collective degree of freedom with a surrounding ``environment.'' Formally, these equations are much more general, involving as they do a more or less arbitrary ``system,'' characterized by some time-dependent potential, which is coupled via a nonlinear, time-dependent interaction to a ``bath'' of oscillators with time-dependent frequencies. The analysis reveals that, even in a Markov limit, which can often be justified, the time dependences and nonlinearities can induce new and potentially significant effects, such as systematic and stochastic mass renormalizations and state-dependent ``memory'' functions, aside from the standard ``friction'' of a heuristic Langevin description. One specific example is discussed in detail, namely the case of an inflaton field, characterized by a Landau-Ginsburg potential, that is coupled quadratically to a bath of scalar ``radiation.'' The principal conclusion derived from this example is that nonlinearities and time-dependent couplings do {\\em not} preclude the possibility of deriving a fluctuation-dissipation theorem, and do {\\em not} change the form of the late-time steady state solution for the system, but {\\em can} significantly shorten the time scale for the approach towards the steady state.

Salman Habib; Henry E. Kandrup

1992-08-13T23:59:59.000Z

182

Correlation of ultraviolet-induced stress changes and negative index growth in type IIa germanosilicate waveguide gratings  

Science Journals Connector (OSTI)

The stress anisotropy in planar germanosilicate waveguides is used to follow the changes in stress, measured as a birefringence, with UV irradiation. Compressive stress increases...

Canning, J; Åslund, M

1999-01-01T23:59:59.000Z

183

SciTech Connect: SLAC Disk Loaded Waveguide (DLWG) Accelerator...  

Office of Scientific and Technical Information (OSTI)

(DOE SC) Country of Publication: United States Language: English Subject: OTHER Word Cloud More Like This Full Text preview image File size NAView Full Text View Full Text DOI:...

184

Chisolm View | Open Energy Information  

Open Energy Info (EERE)

Chisolm View Chisolm View Jump to: navigation, search Name Chisolm View Facility Chisolm View Sector Wind energy Facility Type Commercial Scale Wind Facility Status In Service Owner GE Energy Financial Service / Enel Green Power North America Developer TradeWind Energy Energy Purchaser Alabama Power Company Location Hunter OK Coordinates 36.59527057°, -97.54501104° 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":36.59527057,"lon":-97.54501104,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

185

Enhancing retinal images by nonlinear registration  

E-Print Network [OSTI]

Being able to image the human retina in high resolution opens a new era in many important fields, such as pharmacological research for retinal diseases, researches in human cognition, nervous system, metabolism and blood stream, to name a few. In this paper, we propose to share the knowledge acquired in the fields of optics and imaging in solar astrophysics in order to improve the retinal imaging at very high spatial resolution in the perspective to perform a medical diagnosis. The main purpose would be to assist health care practitioners by enhancing retinal images and detect abnormal features. We apply a nonlinear registration method using local correlation tracking to increase the field of view and follow structure evolutions using correlation techniques borrowed from solar astronomy technique expertise. Another purpose is to define the tracer of movements after analyzing local correlations to follow the proper motions of an image from one moment to another, such as changes in optical flows that would be o...

Molodij, Guillaume; Glanc, Marie; Chenegros, Guillaume

2014-01-01T23:59:59.000Z

186

Nonlinear backscattering from opaque media  

Science Journals Connector (OSTI)

The angular distribution of light scattered from an opaque medium is considered in the case in which the medium is both nonlinear and disordered. It is shown that at the top of the linear backscattering peak there should be a narrow dip in the scattered intensity due to the simultaneous effects of nonlinearity and weak localization. The relative depth of this dip is proportional to the imaginary part of the nonlinear constant ?(3) and the intensity of the incident light.

V. M. Agranovich and V. E. Kravtsov

1991-06-01T23:59:59.000Z

187

Nonlinear waves in strongly interacting relativistic fluids  

E-Print Network [OSTI]

During the past decades the study of strongly interacting fluids experienced a tremendous progress. In the relativistic heavy ion accelerators, specially the RHIC and LHC colliders, it became possible to study not only fluids made of hadronic matter but also fluids of quarks and gluons. Part of the physics program of these machines is the observation of waves in this strongly interacting medium. From the theoretical point of view, these waves are often treated with li-nearized hydrodynamics. In this text we review the attempts to go beyond linearization. We show how to use the Reductive Perturbation Method to expand the equations of (ideal and viscous) relativistic hydrodynamics to obtain nonlinear wave equations. These nonlinear wave equations govern the evolution of energy density perturbations (in hot quark gluon plasma) or baryon density perturbations (in cold quark gluon plasma and nuclear matter). Different nonlinear wave equations, such as the breaking wave, Korteweg-de Vries and Burgers equations, are obtained from different equations of state (EOS). In nuclear matter, the Walecka EOS may lead to a KdV equation. We explore equations of state such as those extracted from the MIT Bag Model and from QCD in the mean field theory approach. Some of these equations are integrable and have analytical solitonic solutions. We derive these equations also in spherical and cylindrical coordinates. We extend the analysis to two and three dimensions to obtain the Kadomtsev-Petviashvili (KP) equation, which is the generalization of the KdV. The KP is also integrable and presents analytical solitonic solutions. In viscous relativistic hydrodynamics we have second order patial derivatives which physically represent dissipation terms. We present numerical solutions and their corresponding algorithms for the cases where the equations are not integrable.

D. A. Fogaça; F. S. Navarra; L. G. Ferreira Filho

2012-12-31T23:59:59.000Z

188

Printed 3D Multi-View Images  

Science Journals Connector (OSTI)

The technique to produce full-parallax 3D multi-view still pictures is described. The matrix of source views (from 6x6 to 15x15 views) is built from computer-generated images or...

Kim, Sung-Sik; Son, Kwang-Hun; Saveljev, V V; Son, Jung-Young

2001-01-01T23:59:59.000Z

189

Efficient Cherenkov emission of broadband terahertz radiation from an ultrashort laser pulse in a sandwich structure with nonlinear core  

SciTech Connect (OSTI)

A scheme for efficient generation of broadband terahertz radiation by a femtosecond laser pulse propagating in a planar sandwichlike structure is proposed. The structure consists of a thin nonlinear core cladded with prisms made of a material with low terahertz absorption. The focused into a line laser pulse propagates in the core as a leaky or waveguide mode and emits Cherenkov wedge of terahertz waves in the cladding. We developed a theory that describes terahertz generation in such a structure and calculated spatial distribution of the generated terahertz field, its energy spectrum and optical-to-terahertz conversion efficiency. The developed theory predicts the conversion efficiency of up to several percent in a 1 cm long and 1 cm wide Si-LiNbO{sub 3}-Si sandwich structure with a 20 {mu}m thick nonlinear layer pumped by 8.5 {mu}J Ti:sapphire laser with pulse duration of 100 fs.

Bodrov, S. B. [Institute of Applied Physics, Russian Academy of Sciences, Nizhny Novgorod 603950 (Russian Federation); University of Nizhny Novgorod, Nizhny Novgorod 603950 (Russian Federation); Bakunov, M. I. [University of Nizhny Novgorod, Nizhny Novgorod 603950 (Russian Federation); Institute of Applied Physics, Russian Academy of Sciences, Nizhny Novgorod 603950 (Russian Federation); Hangyo, M. [Laser Terahertz Division, Institute of Laser Engineering, Osaka University, Osaka (Japan)

2008-11-01T23:59:59.000Z

190

Optical emission from a high-refractive-index waveguide excited by a traveling electron beam  

SciTech Connect (OSTI)

An optical emission scheme was demonstrated, in which a high-refractive-index waveguide is excited by a traveling electron beam in a vacuum environment. The waveguide was made of Si-SiO{sub 2} layers. The velocity of light propagating in the waveguide was slowed down to 1/3 of that in free space due to the high refractive index of Si. The light penetrated partly into the vacuum in the form of a surface wave. The electron beam was emitted from an electron gun and propagated along the surface of the waveguide. When the velocity of the electron coincided with that of the light, optical emission was observed. This emission is a type of Cherenkov radiation and is not conventional cathode luminescence from the waveguide materials because Si and SiO{sub 2} are transparent to light at the emitted wavelength. This type of emission was observed in an optical wavelength range from 1.2 to 1.6 {mu}m with an electron acceleration voltage of 32-42 kV. The characteristics of the emitted light, such as the polarization direction and the relation between the acceleration voltage of the electron beam and the optical wavelength, coincided well with the theoretical results. The coherent length of an electron wave in the vacuum was confirmed to be equal to the electron spacing, as found by measuring the spectral profile of the emitted light.

Kuwamura, Yuji; Yamada, Minoru; Okamoto, Ryuichi; Kanai, Takeshi; Fares, Hesham [Division of Electrical Engineering and Computer Science, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa 920-1192 (Japan)

2008-11-15T23:59:59.000Z

191

Nonlinear friction in quantum mechanics  

E-Print Network [OSTI]

The effect of nonlinear friction forces in quantum mechanics is studied via dissipative Madelung hydrodynamics. A new thermo-quantum diffusion equation is derived, which is solved for the particular case of quantum Brownian motion with a cubic friction. It is extended also by a chemical reaction term to describe quantum reaction-diffusion systems with nonlinear friction as well.

Roumen Tsekov

2010-03-01T23:59:59.000Z

192

Metamaterial-Enhanced Nonlinear Terahertz Spectroscopy  

E-Print Network [OSTI]

We demonstrate large nonlinear terahertz responses in the gaps of metamaterial split ring resonators in several materials and use nonlinear THz transmission and THz-pump/THz-probe spectroscopy to study the nonlinear responses ...

Hwang, Harold Young

193

List View | Data.gov  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

List View List View Safety Data/Tools Apps Challenges Resources Blogs Let's Talk Safety You are here Data.gov » Communities » Safety List View Interactive applications that visually display large datasets provide a portal to explore data and make discoveries. Federal agencies collect information on energy production, use, natural resources, and energy infrastructure logistics and this data can be used to create calculators, interactive maps, and other applications that leverage this data. These applications provide user communities the ability to highlight the energy issues that are occurring within their communities, aid businesses plan and analyze their proposed projects, and provide a baseline for analyzing how energy resources can be most optimally and efficiently used. This page

194

Stimulated Emission from a Single Excited Atom in a Waveguide Eden Rephaeli1,* and Shanhui Fan2,  

E-Print Network [OSTI]

Stimulated Emission from a Single Excited Atom in a Waveguide Eden Rephaeli1,* and Shanhui Fan2, 1; published 3 April 2012) We study stimulated emission from an excited two-level atom coupled to a waveguide by the atom, plays a very important role in stimulated emission. Additionally, the temporal duration

Fan, Shanhui

195

Wide field of view telescope  

DOE Patents [OSTI]

A wide field of view telescope having two concave and two convex reflective surfaces, each with an aspheric surface contour, has a flat focal plane array. Each of the primary, secondary, tertiary, and quaternary reflective surfaces are rotationally symmetric about the optical axis. The combination of the reflective surfaces results in a wide field of view in the range of approximately 3.8.degree. to approximately 6.5.degree.. The length of the telescope along the optical axis is approximately equal to or less than the diameter of the largest of the reflective surfaces.

Ackermann, Mark R. (Albuquerque, NM); McGraw, John T. (Placitas, NM); Zimmer, Peter C. (Albuquerque, NM)

2008-01-15T23:59:59.000Z

196

Nonlinear integrable ion traps  

SciTech Connect (OSTI)

Quadrupole ion traps can be transformed into nonlinear traps with integrable motion by adding special electrostatic potentials. This can be done with both stationary potentials (electrostatic plus a uniform magnetic field) and with time-dependent electric potentials. These potentials are chosen such that the single particle Hamilton-Jacobi equations of motion are separable in some coordinate systems. The electrostatic potentials have several free adjustable parameters allowing for a quadrupole trap to be transformed into, for example, a double-well or a toroidal-well system. The particle motion remains regular, non-chaotic, integrable in quadratures, and stable for a wide range of parameters. We present two examples of how to realize such a system in case of a time-independent (the Penning trap) as well as a time-dependent (the Paul trap) configuration.

Nagaitsev, S.; /Fermilab; Danilov, V.; /SNS Project, Oak Ridge

2011-10-01T23:59:59.000Z

197

Nonlinear arcsin-electrodynamics  

E-Print Network [OSTI]

A new model of nonlinear electrodynamics with three parameters is suggested and investigated. It is shown that if the external constant magnetic field presents the phenomenon of vacuum birefringence takes place. The indexes of refraction for two polarizations of electromagnetic waves, parallel and perpendicular to the magnetic induction field are calculated. The electric field of a point-like charge is not singular at the origin and the static electric energy is finite. We have calculated the static electric energy of point-like particles for different parameters of the model. The canonical and symmetrical Belinfante energy-momentum tensors and dilatation current are obtained. We demonstrate that the dilatation symmetry and dual symmetry are broken in the model suggested.

Kruglov, S I

2014-01-01T23:59:59.000Z

198

Nonlinear arcsin-electrodynamics  

E-Print Network [OSTI]

A new model of nonlinear electrodynamics with three parameters is suggested and investigated. It is shown that if the external constant magnetic field presents the phenomenon of vacuum birefringence takes place. The indexes of refraction for two polarizations of electromagnetic waves, parallel and perpendicular to the magnetic induction field are calculated. The electric field of a point-like charge is not singular at the origin and the static electric energy is finite. We have calculated the static electric energy of point-like particles for different parameters of the model. The canonical and symmetrical Belinfante energy-momentum tensors and dilatation current are obtained. We demonstrate that the dilatation symmetry and dual symmetry are broken in the model suggested.

S. I. Kruglov

2014-10-24T23:59:59.000Z

199

Method of adiabatic modes in studying problems of smoothly irregular open waveguide structures  

SciTech Connect (OSTI)

Basic steps in developing an original method of adiabatic modes that makes it possible to solve the direct and inverse problems of simulating and designing three-dimensional multilayered smoothly irregular open waveguide structures are described. A new element in the method is that an approximate solution of Maxwell's equations is made to obey 'inclined' boundary conditions at the interfaces between themedia being considered. These boundary conditions take into account the obliqueness of planes tangent to nonplanar boundaries between the media and lead to new equations for coupled vector quasiwaveguide hybrid adiabatic modes. Solutions of these equations describe the phenomenon of 'entanglement' of two linear polarizations of an irregular multilayered waveguide, the appearance of a new mode in an entangled state, and the effect of rotation of the polarization plane of quasiwaveguide modes. The efficiency of the method is demonstrated by considering the example of numerically simulating a thin-film generalized waveguide Lueneburg lens.

Sevastianov, L. A., E-mail: sevast@sci.pfu.edu.ru [Peoples' Friendship University of Russia (Russian Federation); Egorov, A. A. [Russian Academy of Sciences, Prokhorov General Physics Institute (Russian Federation)] [Russian Academy of Sciences, Prokhorov General Physics Institute (Russian Federation); Sevastyanov, A. L. [Peoples' Friendship University of Russia (Russian Federation)] [Peoples' Friendship University of Russia (Russian Federation)

2013-02-15T23:59:59.000Z

200

Limited View Angle Iterative CT Reconstruction  

E-Print Network [OSTI]

;Some Prior Literature in Limited View Tomography CT with limited-angle data and few views IRR algorithm Iterative Reconstruction-Reprojection (IRR) : An Algorithm for Limited Data Cardiac- Computed-views and limited-angle data in divergent-beam CT by E. Y. Sidky, CM Kao, and X. Pan (2006) Few-View Projection

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to obtain the most current and comprehensive results.


201

Census and viewing of organisms  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Census and viewing of organisms Census and viewing of organisms Name: m hariaczyi Status: N/A Age: N/A Location: N/A Country: N/A Date: Around 1993 Question: How many organisms exist in the world today? What is the most powerful microscope that could be used for viewing organism? Replies: The most powerful microscope is called an electron microscope, which can be used for viewing entire organisms, although few organisms are small enough to see all of them at high magnifications allowed by this microscope. So most often its used to look at fixed sections of organisms. Since the electron microscope only works in a vacuum, with no air, you cannot look at live organisms. To do that, probably the most powerful microscope is called a Nomarski, or in technical terms, a "differential interference contrast" microscope. This is a modification of a normal light microscope that allows better contrast in living tissue. It is not any more powerful than a light microscope, and is much less powerful than an electron microscope, but it allows you to see living things much better.

202

GoddardView Welcome Home!  

E-Print Network [OSTI]

GoddardView Welcome Home! Pg 2 - 3 History's Greatest Comet Hunter Pg 8 Employee Spotlight: Ernest Program Ends Amid Kudos - 6 Engineers Organize With A Desire To Inspire - 7 History's Greatest Comet on the runway at Edwards Air Force Base, California, after a safe landing August 9, 2005. Photo Credit: NASA 02

Christian, Eric

203

View  

Science Journals Connector (OSTI)

Mn, the concentration gradient that drives the diffusion is maintained by the precipitation of insoluble oxides. In the case of Cd, ... Cientifica e Tecnologica (

2000-10-07T23:59:59.000Z

204

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E-Print Network [OSTI]

May 18, 2012 ... bottleneck, long-time production simulations will be severely hampered ...... t ¼ 0.975, (g) t ¼ 1.0, (h) t ¼ 1.025, (i) t ¼ 1.275, (j) t ¼ 1.525, (k) t ¼ ...

S. Dong

2012-06-21T23:59:59.000Z

205

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E-Print Network [OSTI]

In order to increase the search capability of MBH, a population framework has been proposed ... The key idea is to avoid new individuals to enter the population if someone similar (in a ..... We measure the efficiency in terms of number of (two-.

andrea,,,

206

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E-Print Network [OSTI]

May 31, 2005 ... Robert M. Freund: MIT Sloan School of Management, 50 Memorial Drive, Cambridge, Massachusetts 02139-4307, ...... the transition kernel.

2005-05-30T23:59:59.000Z

207

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Science Journals Connector (OSTI)

89-l 1268) ran the carbon analysis of the sediment trap material ..... vehicle camera system were analyzed with a ... tribution of distances with the computer pro-.

1999-12-21T23:59:59.000Z

208

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E-Print Network [OSTI]

obtained by using different uncertainty sets estimated using simulated and ... Given a fixed mix of electric power plants (nuclear, thermal, hydroelectric, and ...

2011-01-28T23:59:59.000Z

209

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E-Print Network [OSTI]

Aug 19, 2009 ... linear-algebraic and graph theoretic properties of this matrix class. The con- ..... The MatLab solvers linprog and quadprog were used.

2010-03-14T23:59:59.000Z

210

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E-Print Network [OSTI]

Mar 14, 2006 ... ... of the paper is devoted to the development of background material for ..... Note that the optimization problem in the correction phase is solved over ...... In Phase I

2006-03-31T23:59:59.000Z

211

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E-Print Network [OSTI]

Mar 1, 2007 ... 2The logarithmic barrier for the half space {u ? Rn | a · u ? b} is ..... in the Uncapacitated Falicity Location Library (UflLib) [Hoe06]. .... For our test we use 36 unsolved UFL instances that come from two public sets of instances.

2007-03-01T23:59:59.000Z

212

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E-Print Network [OSTI]

cT w tj (cj z) + o (1) = wti (z) + o (1), since c-Ow(cz) = w(z) for any w E W and c > 0. We have obtained a contradiction with (2.29), which proves (2.28). If w t = w(' ...

2004-12-25T23:59:59.000Z

213

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Science Journals Connector (OSTI)

Apr 15, 1976 ... terms of Hairston's hypothesis, to find that only the ... be a component of the search by grazers .... to stop searching and to enter into a state.

2000-01-05T23:59:59.000Z

214

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E-Print Network [OSTI]

which has a 0 infimum, but does not attain it. Here the certificates of the bad behavior of the system in (3.32) are. Z = (. 1 0. 0 0. ) , V = (. 0 1. 1 0. ) . Example 2.

2014-05-14T23:59:59.000Z

215

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E-Print Network [OSTI]

1. Introduction. The purpose of the present paper is to develop some new directions of investigation in ..... For each i = 1, ..., m, and g = (x1, ..., xr,mr ), we have.

2003-09-25T23:59:59.000Z

216

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E-Print Network [OSTI]

Definition 1 The persistency of a variable xi is defined to be the probability that xi = 1 in the ..... i , we know a limited set of marginal moments mr i . We let ? ...

2005-04-19T23:59:59.000Z

217

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E-Print Network [OSTI]

In [4], Devinatz, Hopkins, and Smith proved the nilpotence theorem, a remark- able result which provides algebraic means for detecting nilpotence in the ...

1997-12-15T23:59:59.000Z

218

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Science Journals Connector (OSTI)

carbon (C) and increased mixing energies, making CO, limitation less likely. .... Verde Reef (Vera Cruz, Mexico). ..... solar energy is more important in deter-.

2000-03-03T23:59:59.000Z

219

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E-Print Network [OSTI]

Sep 3, 2003 ... Superconductors are able to carry equilibrium currents without resistance. .... by an Ohm's law where ? is the electric conductivity and b1 is a ...

1910-31-00T23:59:59.000Z

220

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Science Journals Connector (OSTI)

Oct 27, 1982 ... study area does not contain indigenous io- .... Zn Handbook ofgeochemistry. V. 7, part 4. Spring ... Lakes-physics, chemistry, geology. Springer.

2000-02-09T23:59:59.000Z

Note: This page contains sample records for the topic "nonlinear waveguides view" 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

View  

Science Journals Connector (OSTI)

This lake is in the Kigezi Highlands, western Uganda, in a narrow steep-sided branching river valley about 20 km long that has been dammed and drowned by a.

Orcas

222

View  

Science Journals Connector (OSTI)

1943. Treatment of experimental data. Wiley,. New York, N.Y. 344 p. ZIIIN-ELDIN, Z. P. 1961. Plankton pigments in. East Lagoon, Galveston, Texas. Trans. Am.

Orcas

223

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E-Print Network [OSTI]

GLEV train, a new bullet train under development in Japan, is formulated as the ... conservation law and v ? c represents a constraint on the maximum capacity at each ... Railways Technical Research Institute, Kokubunji, Tokyo 185-8540 Japan ... optimization since 1984 when Karmarkar proposed the projective scaling ...

2002-10-31T23:59:59.000Z

224

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E-Print Network [OSTI]

the random consequences of the chosen action, h(x, ?), are preferred to those of a baseline random variable Z for all utility ...... Ground truth. Envelope. Figure 3: ...

2012-06-29T23:59:59.000Z

225

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E-Print Network [OSTI]

A major challenge in using optimization to make risk-averse decisions in the face of uncertainty is how to specify an acceptable level of risk. Recently, Dentcheva ...

2011-06-22T23:59:59.000Z

226

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E-Print Network [OSTI]

maximum acceptable risk that one is willing to take. ... of initial wealth allocated to the assets, CVaR?(?T x) measures the risk of a given allocation x, b. 1 ...

2009-03-26T23:59:59.000Z

227

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E-Print Network [OSTI]

acceptable level of risk. As shown in [2], Problem (3) is a difficult, in fact NP-hard, combinatorial problem. Following [17] and [21], we choose to tackle it by ...

2010-02-08T23:59:59.000Z

228

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E-Print Network [OSTI]

allowed to be violated an “acceptable” amount of time. There are no ... optimal investment strategies with a certain level of risk [10]. Up to this point most research ...

2008-05-24T23:59:59.000Z

229

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E-Print Network [OSTI]

in the primal problem. As it can be seen by the number of floating point operations needed to generate the approximation to the set of efficient points, the strategy.

230

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E-Print Network [OSTI]

Oct 29, 2008 ... serial machine in floating point is well below our needs. 3 Notation. We are given an m × d design matrix P of floating point numbers and an.

2008-10-28T23:59:59.000Z

231

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E-Print Network [OSTI]

function, and the nuclear norm. The support function is based on the graph of the product of a matrix with its transpose. Closed form expressions for the support ...

2014-08-28T23:59:59.000Z

232

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E-Print Network [OSTI]

the results of [8] to obtain, for each natural number n, a simple nuclear C?- algebra An whose ordered K0-group is order isomorphic to Zn. This result was further ...

2008-02-01T23:59:59.000Z

233

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E-Print Network [OSTI]

the UCT and reproves Huaxin Lin's theorem on the classification of nuclear tracially AF ... A deep conjecture of Elliott asserts that the simple separable nuclear ...

2004-06-29T23:59:59.000Z

234

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E-Print Network [OSTI]

Q we have yi = Gdi and the G–orthogonality condition of vectors si, si+1 can be written as ?isT i Gsi+1 = yT i si+1 = 0 (we assume that ?i = 0). This together with ...

2009-03-10T23:59:59.000Z

235

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E-Print Network [OSTI]

job Ji is a function of its completion time, usually denoted by Ci. ..... For any t > max(P, d), there exists a value ? > 0 and a job index i? ? {1,...,n} such that, for any ...

2006-03-29T23:59:59.000Z

236

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E-Print Network [OSTI]

Feb 28, 2006 ... Abstract. The major focus of this work is to compare several methods for computing the proximal point of a nonconvex function via numerical ...

2006-02-28T23:59:59.000Z

237

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E-Print Network [OSTI]

Our original motivating application is in Electronics and arises in the development of pulse ...... In 8th International Symposium on Fundamentals of Computa-.

Christoph Buchheim,,,

238

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E-Print Network [OSTI]

Feb 28, 2012 ... and P. Dorta-González. Departamento de Métodos Cuantitativos en Econom?a y Gestión. Universidad de Las Palmas de Gran Canaria (Spain).

2012-02-28T23:59:59.000Z

239

Efficient vertical coupling of photodiodes to InGaAsP rib waveguides  

SciTech Connect (OSTI)

We demonstrate vertical integration of InGaAs mesa photodiodes with InGaAsP rib waveguides employing an intermediate optical impedance matching layer. The diode length necessary for 90% light absorption at 1.52 {mu}m wavelength was 42 {mu}m, a threefold reduction in diode length with respect to previous work employing similar waveguides without a matching layer. The quantum efficiency was observed to be almost independent of the optical wavelength and polarization. The influence of spatial transient intensity redistribution effects on these devices is investigated in detail.

Deri, R.J.; Doldissen, W.; Hawkins, R.J.; Bhat, R.; Soole, J.B.D.; Schiavone, L.M.; Seto, M.; Andreadakis, N.; Silberberg, Y.; Koza, M.A. (Bellcore, 331 Newman Springs Road, Red Bank, New Jersey 07701-7040 (USA))

1991-06-17T23:59:59.000Z

240

Disorder-induced transparency in a one-dimensional waveguide side coupled with optical cavities  

SciTech Connect (OSTI)

Disorder influence on photon transmission behavior is theoretically studied in a one-dimensional waveguide side coupled with a series of optical cavities. For this sake, we propose a concept of disorder-induced transparency appearing on the low-transmission spectral background. Two kinds of disorders, namely, disorders of optical cavity eigenfrequencies and relative phases in the waveguide side coupled with optical cavities are considered to show the disorder-induced transparency. They both can induce the optical transmission peaks on the low-transmission backgrounds. The statistical mean value of the transmission also increases with increasing the disorders of the cavity eigenfrequencies and relative phases.

Zhang, Yongyou, E-mail: yyzhang@bit.edu.cn; Dong, Guangda; Zou, Bingsuo [Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems and School of Physics, Beijing Institute of Technology, Beijing 100081 (China)

2014-05-07T23:59:59.000Z

Note: This page contains sample records for the topic "nonlinear waveguides view" 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

Nonlinear Elasticity of Monolayer Graphene  

Science Journals Connector (OSTI)

By combining continuum elasticity theory and tight-binding atomistic simulations, we work out the constitutive nonlinear stress-strain relation for graphene stretching elasticity and we calculate all the corresponding nonlinear elastic moduli. Present results represent a robust picture on elastic behavior and provide the proper interpretation of recent experiments. In particular, we discuss the physical meaning of the effective nonlinear elastic modulus there introduced and we predict its value in good agreement with available data. Finally, a hyperelastic softening behavior is observed and discussed, so determining the failure properties of graphene.

Emiliano Cadelano; Pier Luca Palla; Stefano Giordano; Luciano Colombo

2009-06-11T23:59:59.000Z

242

Nonlinear vibrational microscopy  

DOE Patents [OSTI]

The present invention is a method and apparatus for microscopic vibrational imaging using coherent Anti-Stokes Raman Scattering or Sum Frequency Generation. Microscopic imaging with a vibrational spectroscopic contrast is achieved by generating signals in a nonlinear optical process and spatially resolved detection of the signals. The spatial resolution is attained by minimizing the spot size of the optical interrogation beams on the sample. Minimizing the spot size relies upon a. directing at least two substantially co-axial laser beams (interrogation beams) through a microscope objective providing a focal spot on the sample; b. collecting a signal beam together with a residual beam from the at least two co-axial laser beams after passing through the sample; c. removing the residual beam; and d. detecting the signal beam thereby creating said pixel. The method has significantly higher spatial resolution then IR microscopy and higher sensitivity than spontaneous Raman microscopy with much lower average excitation powers. CARS and SFG microscopy does not rely on the presence of fluorophores, but retains the resolution and three-dimensional sectioning capability of confocal and two-photon fluorescence microscopy. Complementary to these techniques, CARS and SFG microscopy provides a contrast mechanism based on vibrational spectroscopy. This vibrational contrast mechanism, combined with an unprecedented high sensitivity at a tolerable laser power level, provides a new approach for microscopic investigations of chemical and biological samples.

Holtom, Gary R. (Richland, WA); Xie, Xiaoliang Sunney (Richland, WA); Zumbusch, Andreas (Munchen, DE)

2000-01-01T23:59:59.000Z

243

Scientists seek nonlinear optical materials  

Science Journals Connector (OSTI)

Nonlinear optical materials seem about to do for light what semiconductors already have done for electricity. ... Successful development of these materials could mean big payoffs in telecommunications, data processing, nuclear fusion, and applications of lasers in commerce and industry generally. ...

1982-10-04T23:59:59.000Z

244

A reduced voltage polarization intensity electrooptic modulator in SBN:60 utilizing a step strain waveguide  

E-Print Network [OSTI]

Strain induced optical waveguides have been produced in LiNbo3 and SBN substrate material using a step strain geometry. Propagation losses in SBN as low as 1.43 dB/cm and 2.64 dB/cm were achieved for TE and TM polarizations, respectively...

Ottinger, Tina Lynette

2012-06-07T23:59:59.000Z

245

Constructions and Analyses of Nonblocking WDM Switches Based on Arrayed Waveguide Grating and  

E-Print Network [OSTI]

(and heat dissipation) and large footprint (or space consump­ tion). As the optical device1 Constructions and Analyses of Nonblocking WDM Switches Based on Arrayed Waveguide Grating, qiao}@cse.buffalo.edu Abstract--- Constructing fast wavelength division multi­ plexing (WDM) switches

Ngo, Hung Q.

246

Sub-wavelength waveguide loaded by a complementary electric metamaterial for vacuum electron devices  

SciTech Connect (OSTI)

We report the electromagnetic properties of a waveguide loaded by complementary electric split ring resonators (CeSRRs) and the application of the waveguide in vacuum electronics. The S-parameters of the CeSRRs in free space are calculated using the HFSS code and are used to retrieve the effective permittivity and permeability in an effective medium theory. The dispersion relation of a waveguide loaded with the CeSRRs is calculated by two approaches: by direct calculation with HFSS and by calculation with the effective medium theory; the results are in good agreement. An improved agreement is obtained using a fitting procedure for the permittivity tensor in the effective medium theory. The gain of a backward wave mode of the CeSRR-loaded waveguide interacting with an electron beam is calculated by two methods: by using the HFSS model and traveling wave tube theory; and by using a dispersion relation derived in the effective medium model. Results of the two methods are in very good agreement. The proposed all-metal structure may be useful in miniaturized vacuum electron devices.

Duan, Zhaoyun, E-mail: zhyduan@uestc.edu.cn [Plasma Science and Fusion Center, Massachusetts Institute of Technology, 167 Albany St., Cambridge, Massachusetts 02139 (United States); Institute of High Energy Electronics, School of Physical Electronics, University of Electronic Science and Technology of China, No.4, Section 2, North Jianshe Road, Chengdu 610054 (China); Hummelt, Jason S.; Shapiro, Michael A., E-mail: shapiro@psfc.mit.edu; Temkin, Richard J. [Plasma Science and Fusion Center, Massachusetts Institute of Technology, 167 Albany St., Cambridge, Massachusetts 02139 (United States)

2014-10-15T23:59:59.000Z

247

A waveguide model of the return stroke channel with a "metamaterial" corona  

E-Print Network [OSTI]

is the most energetic process in a lightning flash, during which the highest currents occur and which model the lightning return stroke channel as a three layer cylindrical waveguide, consisting of (1 lightning model [Liang et al., 2010; Carlson et al., 2011] show the short leaders branching away from

Lehtinen, Nikolai G.

248

InP-based waveguide photodiodes heterogeneously integrated on silicon-on-  

E-Print Network [OSTI]

InP-based waveguide photodiodes heterogeneously integrated on silicon-on- insulator for photonic@virginia.edu Abstract: High-linearity modified uni-traveling carrier photodiodes on silicon-on-insulator with low AM and have an output third order intercept point of 30 dBm at 20 GHz. Photodiode arrays exceed a saturation

Bowers, John

249

High-Power InP-based Waveguide Photodiodes and Photodiode Arrays Heterogeneously Integrated on SOI  

E-Print Network [OSTI]

High-Power InP-based Waveguide Photodiodes and Photodiode Arrays Heterogeneously Integrated on SOI evanescently-coupled modified uni-traveling carrier photodiodes (MUTC PDs) on silicon-on-insulator (SOI on silicon is a promising approach to realize high-performance photodiodes on a silicon photonics platform

Bowers, John

250

Accounting for water-column variability in shallow-water waveguide characterizations based on modal eigenvalues  

SciTech Connect (OSTI)

The influence of water-column variability on the characterization of shallow-water waveguides using modal eigenvalue information is considered. This work is based on the relationship between the acoustic pressure field in shallow water and the depth-dependent Green's function through the Hankel transform. In many practical situations, the Hankel transform can be approximated by a Fourier transform, in which case the Green's function is approximated by a horizontal wave number spectrum with discrete peaks corresponding with individual modal eigenvalues. In turn, the wave number data can be used in inverse algorithms to determine geoacoustic properties of the waveguide. Wave number spectra are estimated from measurements of a point-source acoustic field on a horizontal aperture array in the water column. For range-dependent waveguides, techniques analogous to using a short-time Fourier transform are employed to estimate range-dependent wave number spectra. In this work, water-column variability due to linear internal waves and mesoscale features are considered. It will be shown that these two types of variability impact the estimation of range-dependent modal eigenvalues in different ways. Approaches for accounting for these different types of variability will be discussed as they apply to waveguide characterization.

Becker, Kyle M. [Pennsylvania State University, Applied Research Laboratory, P.O. Box 30, State College, PA 16804-0030 (United States); Ballard, Megan S. [Applied Research Laboratories, University of Texas at Austin, Austin, TX 78713-8029 (United States)

2010-09-06T23:59:59.000Z

251

Ultrafast deflection of spatial solitons in AlxGa1-xAs slab waveguides  

E-Print Network [OSTI]

laser pulse. A separate ultrashort pump pulse is focused onto the top of the waveguide, introducing cladding, both with x=0.24. The pulses used to generate and steer the solitons are obtained from an ultrafast laser system: a 250 kHz optical parametric amplifi

Van Driel, Henry M.

252

High-index-contrast ridge waveguide laser with thermally oxidised etched facet and  

E-Print Network [OSTI]

). Laser ridges are then deeply etched, through the active region and into the lower cladding, usingHigh-index-contrast ridge waveguide laser with thermally oxidised etched facet and metal reflector heterostructure laser is demonstrated, which features an etched and wet thermally oxidised rear facet

253

A V-Band Waveguide Transition Design Appropriate for Monolithic Integration  

E-Print Network [OSTI]

Lee, Jae-Sung Rieh, Moonil Kim School of Electrical Engineering, Korea University Seoul, 139-701 Korea for transmitting power such as microstrip line, optical beam, coaxial cable and rectangular waveguide in microwave integration increases complex of manufacturing and large loss for integration. It is reported about 3dB loss

Rieh, Jae-Sung

254

Loss and modal properties of Ag/AgI hollow glass waveguides  

E-Print Network [OSTI]

-mode transmission is obtained when the thickness of the glass wall is large. These smaller bores, thick wall hollow and industrial applications involving the delivery of CO2 laser radiation, but they have also proven use- ful popular structures is the hollow glass waveguide (HGW) comprised of a silica tube with an inner coating

255

V-band Transmission and Reflection Grid Amplifier Packaged in Waveguide  

E-Print Network [OSTI]

for thermal management by allowing the heat sink to be mounted on one side of the grid array. It also reduces and cooling fan were used to remove heat from the chip. The temperature distribution across the grid aperture1 V-band Transmission and Reflection Grid Amplifier Packaged in Waveguide Chun-Tung Cheung1 , Roger

256

Copper waveguide cavities with reduced surface loss for coupling to superconducting qubits  

E-Print Network [OSTI]

Copper waveguide cavities with reduced surface loss for coupling to superconducting qubits Daniela, other recent work has involved qubits coupled to copper cavities with coherence times approaching 0.1 ms. The copper provides a good path for thermalizing the cavity walls and qubit chip, although the substantial

Plourde, Britton L. T.

257

41.8-nm Xe8+ laser driven in a plasma waveguide  

Science Journals Connector (OSTI)

An experimental demonstration of an optical field ionization short-wavelength laser driven in a gas-filled capillary-discharge waveguide is described in detail. Guiding of high-intensity laser pulses has previously been demonstrated with this type of waveguide for capillary discharges in hydrogen. For the present experiments xenon gas was mixed with the hydrogen, and strong lasing on the 4d95d-4d95p transition in Xe8+ at 41.8nm was observed. Under optimum conditions the short-wavelength laser output achieved with the waveguide was found to be greater than that from a Xe gas cell. Measurements of the transmission of the pump laser pulses through the waveguide show that the short-wavelength laser signal was greatest under conditions for which the pump laser pulses were well guided. Simulations of the propagation of the pump laser radiation are presented for a range of initial plasma conditions, and these indicate that the laser-plasma interaction length achieved was greatly increased compared to that which can be achieved in a gas cell.

A. Butler; A. J. Gonsalves; C. M. McKenna; D. J. Spence; S. M. Hooker; S. Sebban; T. Mocek; I. Betttaibi; B. Cros

2004-08-30T23:59:59.000Z

258

Coupling of nitrogen-vacancy centers in diamond to a GaP waveguide  

E-Print Network [OSTI]

The optical coupling of guided modes in a GaP waveguide to nitrogen-vacancy (NV) centers in diamond is demonstrated. The electric field penetration into diamond and the loss of the guided mode are measured. The results indicate that the GaP-diamond system could be useful for realizing coupled microcavity-NV devices for quantum information processing in diamond.

K. -M. C. Fu; C. Santori; P. E. Barclay; I. Aharonovich; S. Prawer; N. Meyer; A. M. Holm; R. G. Beausoleil

2008-11-03T23:59:59.000Z

259

Efficiency Enhancement of a Semi-constrained Waveguide Monopulse Feeder for a Linear Phased  

E-Print Network [OSTI]

, it is suggested in this paper that the aperture modulated waveguide ports make enhancement of aperture efficiency. Phase shifters equalize phase differences between the ports and set the phase for beam steering. Finally N-row slotted W/G array radiates RF power to electromagnetic energy in free space. The power

Myung, Noh-Hoon

260

A complete model for high quality fabrication of Annealed and Reverse Proton Exchanged waveguides in congruent Lithium Niobate  

E-Print Network [OSTI]

A complete model for the fabrication of annealed and reverse proton exchange waveguides in lithium niobate is presented. We characterized the anisotropic diffusion properties of proton exchange, annealing and reverse proton exchange in Z-cut and X-cut substrates using planar waveguides. Using this model we fabricated high quality channel waveguides with propagation losses as low as 0.086 dB/cm and a coupling efficiency with optical fiber of 90% at 1550 nm. The splitting ratio of a set of directional couplers is predicted with an accuracy of $\\pm$ 0.06.

Lenzini, Francesco; Haylock, Ben; Lobino, Mirko

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "nonlinear waveguides view" 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

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

262

www.advmat.de www.MaterialsViews.com  

E-Print Network [OSTI]

Technological University Singapore 637371, Singapore E-mail: qihua@ntu.edu.sg; hdsun@ntu.edu.sg Prof. Q. H in highly efficient light sources (nanola- sers), waveguides, field-effect transistors and photodetectors

Xiong, Qihua

263

Better Buildings Network View | November 2014  

Broader source: Energy.gov [DOE]

The Better Buildings Network View monthly newsletter from the U.S. Department of Energy's Better Buildings Residential Network.

264

Better Buildings Network View | October 2014  

Broader source: Energy.gov [DOE]

The Better Buildings Network View monthly newsletter from the U.S. Department of Energy's Better Buildings Residential Network.

265

Better Buildings Network View | September 2014  

Broader source: Energy.gov [DOE]

The Better Buildings Network View monthly newsletter from the U.S. Department of Energy's Better Buildings Residential Network.

266

Better Buildings Network View | January 2015  

Broader source: Energy.gov [DOE]

The Better Buildings Network View monthly newsletter from the U.S. Department of Energy's Better Buildings Residential Network.

267

Better Buildings Network View | December 2014  

Broader source: Energy.gov [DOE]

The Better Buildings Network View monthly newsletter from the U.S. Department of Energy's Better Buildings Residential Network.

268

The Better Buildings Neighborhood View- Fall 2011  

Broader source: Energy.gov [DOE]

Better Buildings Neighborhood View, from the Better Buildings Neighborhood Program of the U.S. Department of Energy.

269

Better Buildings Network View | February 2014  

Broader source: Energy.gov [DOE]

The Better Buildings Network View monthly newsletter from the U.S. Department of Energy's Better Buildings Residential Network.

270

California's Energy Future - The View to 2050  

E-Print Network [OSTI]

Energy Future - The View to 2050 Bin Biofuel Technology Hydrogen Ethanol from sugar and starch (e.g. , corn,

2011-01-01T23:59:59.000Z

271

The Better Buildings Neighborhood View- July 2012  

Broader source: Energy.gov [DOE]

The Better Buildings Neighborhood View monthly newsletter from the U.S. Department of Energy's Better Buildings Neighborhood Program.

272

Better Buildings Network View | April 2014  

Broader source: Energy.gov [DOE]

The Better Buildings Network View monthly newsletter from the U.S. Department of Energy's Better Buildings Residential Network.

273

Better Buildings Network View | May 2014  

Broader source: Energy.gov [DOE]

The Better Buildings Network View monthly newsletter from the U.S. Department of Energy's Better Buildings Residential Network.

274

Better Buildings Network View | March 2014  

Broader source: Energy.gov [DOE]

The Better Buildings Network View monthly newsletter from the U.S. Department of Energy's Better Buildings Residential Network.

275

Better Buildings Network View | June 2014  

Broader source: Energy.gov [DOE]

The Better Buildings Network View monthly newsletter from the U.S. Department of Energy's Better Buildings Residential Network.

276

480 Gb/s WDM (12×40 Gb/s) data transmission over a dielectric-loaded plasmonic waveguide  

Science Journals Connector (OSTI)

We demonstrate 480 Gb/s (12×40 Gb/s) WDM enabled data transmission through a dielectric loaded plasmonic waveguide. Error-free performance with power penalties ranging between 0.2-1 dB...

Papaioannou, Sotirios; Kalavrouziotis, Dimitris; Giannoulis, Giannis; Apostolopoulos, Dimitris; Avramopoulos, Hercules; Vyrsokinos, Konstantinos; Pleros, Nikos

277

High energy sub-10 fs pulse generation in vacuum ultraviolet using chirped four wave mixing in hollow waveguides  

Science Journals Connector (OSTI)

We numerically study chirped four-wave mixing for VUV pulse generation in hollow waveguides filled with a noble gas. Taking into account ionization effects we predict the generation of...

Babushkin, I; Herrmann, J

2008-01-01T23:59:59.000Z

278

Excitation and Propagation of SLF/ELF Electromagnetic Waves in the Earth–Ionosphere Waveguide/Cavity  

Science Journals Connector (OSTI)

In Chap. 2, the region of interest is a waveguide or cavity between the Earth’s surface and an isotropic homogeneous ionosphere. Both the dipole source and the observation point are assumed to be located on or ne...

Prof. Weiyan Pan; Dr. Kai Li

2014-01-01T23:59:59.000Z

279

Magnetic Proximity Effects in V/Fe Superconductor/Ferromagnet Single Bilayer Revealed by Waveguide-Enhanced Polarized Neutron Reflectometry  

Science Journals Connector (OSTI)

Polarized neutron reflectometry is used to study the magnetic proximity...T C manifested in a systematic change in the height and width of the waveguide resonance peak. Upon increasing the tempera...

Yu. N. Khaydukov; V. L. Aksenov…

2011-01-01T23:59:59.000Z

280

Investigation of a chalcohalide glass optical waveguide structure fabricated by dual-energy carbon-ion implantation  

Science Journals Connector (OSTI)

A planar waveguide structure in a chalcohalide glass was fabricated by dual-energy C ion implantation with energies of 5.5 and 6.0 MeV at fluences of 7.0×1014 and...

Yu, Xiao-Fei; Liu, Tao; Zhang, Lian; Zhou, Yu-Fan; Wang, Tie-Jun; Wang, Xue-Lin

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "nonlinear waveguides view" 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

Studies of Nonlinear Problems, I  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

. . . ~0s ALAMOS SCIENTIFIC LABORATORY of the UNIVERSITY OF CALIFORNIA ' . c' . .: . Report written: May 1955 Report distributed: LA-1940 h .1 STUDIES OF NONLINEAR PROBLEMS. I . - 4 . . . ._~ Work done by: E. Fermi J. Pasta S. Ulam M. Tsingou PHYSICS Report written by: E. Fermi J. Pasta S. Ulam DISCLAIMER Portions of this document may be illegible in electronic image products. Images are produced from the best available document. original . - . * * , . ' ABSTRACT " .*. . A one-dimensional dynamical system of 64 particles with forces be- . . . tween neighbors containing nonlinear terms has been studied on the Los Alamos computer MANIAC I. The nonlinear terms considered are quadratic, cubic, and broken linear types. The results are analyzed into Fourier

282

Nonlinear dynamics and plasma transport  

SciTech Connect (OSTI)

This progress report details work done on a program in nonlinear dynamical aspects of plasma turbulence and transport funded by DOE since 1989. This program has been in cooperation with laboratories in theUSSR [now Russia and the Confederation of Independent States (CIS)]. The purpose of this program has been: To promote the utilization of recent pathbreaking developments in nonlinear science in plasma turbulence and transport. To promote cooperative scientific investigations between the US and CIS in the related areas of nonlinear science and plasma turbulence and transport. In the work reported in our progress report, we have studied simple models which are motivated by observation on actual fusion devices. The models focus on the important physical processes without incorporating the complexity of the geometry of real devices. This allows for a deeper analysis and understanding of the system both analytically and numerically.

Antonsen, T.M. Jr.; Drake, J.F.; Finn, J.M.; Guzdar, P.N.; Hassam, A.B.; Sageev, R.Z.

1993-01-01T23:59:59.000Z

283

Entanglement verification via nonlinear witnesses  

E-Print Network [OSTI]

The controlled generation of entangled states and their subsequent detection are integral aspects of quantum information science. In this work, we analyse the application of nonlinear witnesses to the verification of entanglement, and we demonstrate experimentally that nonlinear witnesses perform significantly better than linear witnesses. Specifically, we demonstrate that a single non- linear entanglement witness is able to determine to a high degree of certainty that a mixed state containing orbital angular momentum (OAM) entanglement of specific forms is entangled for any relative phase and sufficient fidelity. This is a significant improvement over linear witnesses, which cannot provide the same level of performance. We envisage that nonlinear witnesses and our method of state preparation will have further uses in areas of quantum science such as superdense coding and quantum key distribution.

Megan Agnew; Jeff Z. Salvail; Jonathan Leach; Robert W. Boyd

2012-10-03T23:59:59.000Z

284

Street Light View: Enriching Navigable Panoramic Street View Maps with Informative Illumination Thumbnails  

E-Print Network [OSTI]

1 Street Light View: Enriching Navigable Panoramic Street View Maps with Informative Illumination, Stony Brook University ABSTRACT Google Street View is a technology featured in Google Maps and Google Earth that provides panoramic and immersive views of street scenes in many cities around the world

Mueller, Klaus

285

TotalView Parallel Debugger at NERSC  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Totalview Totalview Totalview Description TotalView from Rogue Wave Software is a parallel debugging tool that can be run with up to 512 processors. It provides both X Windows-based Graphical User Interface (GUI) and command line interface (CLI) environments for debugging. The performance of the GUI can be greatly improved if used in conjunction with free NX software. The TotalView documentation web page is a good resource for learning more about some of the advanced TotalView features. Accessing Totalview at NERSC To use TotalView at NERSC, first load the TotalView modulefile to set the correct environment settings with the following command: % module load totalview Compiling Code to Run with TotalView In order to use TotalView, code must be compiled with the -g option. We

286

A PHILOSOPHICAL VIEW OF CIVILIZATION  

Science Journals Connector (OSTI)

Publisher Summary Civilization comprises the dynamic interchange or “transaction” between three open entities—human nature, values and environment, physical and ideal—and can be understood only as their “emergence” or “transcendence.” The scientific and technological age views civilization in East or West largely in the context of man's control and manipulation of nature. The furniture and appurtenances of civilized living, the scaffolding and the frame-work rather than the mansion itself loom larger in the picture. However, the mansion of civilization is represented by the insights, appreciations, values and aspirations of mankind. It is these enduring experiences of the race which embody the essence of civilization and should obtain primary consideration in any adequate treatment. As the philosophy of science and technology makes a tour round the globe, the meanings, appreciations, and values that civilization actually experiences in its orientation to cosmos and to existence as a whole are discounted as metaphysical and religious—irrelevant for modern secular culture.

RADHAKAMAL MUKERJEE

2014-01-01T23:59:59.000Z

287

Developments and advances in nonlinear terahertz spectroscopy  

E-Print Network [OSTI]

Nonlinear terahertz (THz) spectroscopy is a rapidly developing field, which is concerned with driving and observing nonlinear material responses in the THz range of the electromagnetic spectrum. In this thesis, I present ...

Brandt, Nathaniel Curran

2014-01-01T23:59:59.000Z

288

NONLINEAR APPROXIMATIONS FOR ELECTRONIC STRUCTURE CALCULATIONS  

E-Print Network [OSTI]

NONLINEAR APPROXIMATIONS FOR ELECTRONIC STRUCTURE CALCULATIONS G. BEYLKIN AND T. S. HAUT Abstract. We present a new method for electronic structure calculations based on novel algorithms for nonlinear numerical calculus suitable for electronic structure calculations. For any spatial orbital

Beylkin, Gregory

289

A View from the Bridge - DOE Perspective | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

A View from the Bridge - DOE Perspective A View from the Bridge - DOE Perspective Broad view of DOE's approach to addressing transportation sector oil dependence...

290

Better Buildings Network View | April 2014 | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Network View | April 2014 Better Buildings Network View | April 2014 The Better Buildings Network View monthly newsletter from the U.S. Department of Energy's Better Buildings...

291

Nonlinear dispersion and compact structures  

SciTech Connect (OSTI)

Relaxing the distinguished ordering underlying the derivation of soliton supporting equations leads to new equations endowed with nonlinear dispersion crucial for the formation and coexistence of compactons, solitons with a compact support, and conventional solitons. Vibrations of the anharmonic mass-spring chain lead to a new Boussinesq equation admitting compactons and compact breathers. The model equation [ital u][sub [ital t

Rosenau, P. (Technion, Haifa 32000 (Israel) Center For Nonlinear Studies, MS-B258 Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States))

1994-09-26T23:59:59.000Z

292

Nonlinear resonance in vibrating strings  

Science Journals Connector (OSTI)

A simple stretched string driven sinusoidally is commonly used to illustrate the concepts of resonance and eigenmodes. In practice such a system rarely executes planar oscillation but prefers circular motion. This is shown to be a consequence of the intrinsic nonlinearity of the stretched string oscillator and the associated parametric coupling between the two transverse polarizations.

John A. Elliott

1982-01-01T23:59:59.000Z

293

Observation and numerical analysis of plasma parameters in a capillary discharge-produced plasma channel waveguide  

SciTech Connect (OSTI)

We observed the parameters of the discharge-produced plasma in cylindrical capillary. Plasma parameters of the waveguide were investigated by use of both a Normarski laser interferometer and a hydrogen plasma line spectrum. A space-averaged maximum temperature of 3.3 eV with electron densities of the order of 10{sup 17} cm{sup -3} was observed at a discharge time of 150 ns and a maximum discharge current of 200 A. One-dimensional dissipative magnetohydrodynamic (MHD) code was used to analyze the discharge dynamics in the gas-filled capillary discharge waveguide for high-intensity laser pulses. Simulations were performed for the conditions of the experiment. We compared the temporal behavior of the electron temperature and the radial electron density profiles, measured in the experiment with the results of the numerical simulations. They occurred to be in a good agreement. An ultrashort, intense laser pulse was guided by use of this plasma channel.

Terauchi, Hiromitsu [Department of Advanced Interdisciplinary Sciences, and Center for Optical Research and Education (CORE) Utsunomiya University, Yoto 7-1-2, Utsunomiya, Tochigi 321-8585 (Japan); Bobrova, Nadezhda; Sasorov, Pavel [Institute for Theoretical and Experimental Physics, B. Cheremushkinskaya str. 25, 117259 Moscow (Russian Federation); Kikuchi, Takashi; Sasaki, Toru [Department of Electrical Engineering, Nagaoka University of Technology, Kami-tomiokamachi 1603-1, Nagaoka, Niigata 940-2188 Japan (Japan); Higashiguchi, Takeshi; Yugami, Noboru [Department of Advanced Interdisciplinary Sciences, and Center for Optical Research and Education (CORE) Utsunomiya University, Yoto 7-1-2, Utsunomiya, Tochigi 321-8585 (Japan); Japan Science and Technology Agency, CREST, 4-1-8 Honcho, Kanagawa, Saitama 332-0012 (Japan); Kodama, Ryosuke [Japan Science and Technology Agency, CREST, 4-1-8 Honcho, Kanagawa, Saitama 332-0012 (Japan); Graduate School of Engineering, Osaka University, 2-6 Yamada-oka, Suita, Osaka 565-0871 (Japan)

2011-03-01T23:59:59.000Z

294

Selection of modes in transverse-mode waveguides for semiconductor lasers based on asymmetric heterostructures  

SciTech Connect (OSTI)

Asymmetric Al{sub 0.3}Ga{sub 0.7}As/GaAs/InGaAs heterostructures with a broadened waveguide produced by the method of MOCVD epitaxy are studied. It is established that the precision shift of the active region to one of the cladding layers ensures the generation of the chosen mode of high order in the transverse broadened waveguide. It is experimentally established that this shift brings about an increase in internal optical losses and a decrease in the internal quantum efficiency of stimulated emission. It is shown experimentally that the shift of the active region to the n-type cladding layer governs the sublinear form of the power-current characteristic for semiconductor lasers; in the case of a shift of the active region towards the p-type cladding layer, the laser diodes demonstrated a linear dependence of optical power on the pump current in the entire range of pump currents.

Slipchenko, S. O., E-mail: Serghpl@mail.ioffe.ru; Bondarev, A. D.; Vinokurov, D. A.; Nikolaev, D. N.; Fetisova, N. V.; Sokolova, Z. N.; Pikhtin, N. A.; Tarasov, I. S. [Russian Academy of Sciences, Ioffe Physicotechnical Institute (Russian Federation)

2009-01-15T23:59:59.000Z

295

A proposed measurement of the reverse Cherenkov radiation effect in a metamaterial-loaded circular waveguide  

SciTech Connect (OSTI)

The authors have recently proposed an experiment on verification of the Reverse Cherenkov Radiation (RCR) effect in a Left-Handed-Material-loaded waveguide. Applications of the RCR effect may range from novel higher-order-mode suppressors in microwave and millimeter-wave sources to improved particle detectors for satellite non-proliferation missions. The experimental configuration includes a circular waveguide filled with an artificial metamaterial with simultaneously negative permittivity and permeability, in which the electromagnetic wave with a frequency of 95 GHz will interact with an electron beam. They have demonstrated that for certain values of effective permittivity and permeability only the backward-propagating mode can be exited by the electron beam. At the conference they will present some newly developed metamaterial designs, which they plan to employ for producing the proper effective medium parameters for this experiment.

Shchegolkov, Dmitry [Los Alamos National Laboratory; Azad, Abul K [Los Alamos National Laboratory; O' Hara, John F [Los Alamos National Laboratory; Smirnova, Evgenya I [Los Alamos National Laboratory

2009-01-01T23:59:59.000Z

296

High-Gradient Tests of the Single-Cell SC Cavity with a Feedback Waveguide  

SciTech Connect (OSTI)

Use of a superconducting (SC) traveling-wave accelerating (STWA) structure with a small phase advance per cell, rather than a standing-wave structure, may provide a significant increase in the accelerating gradient in the ILC linac [1]. For the same surface electric and magnetic fields, the STWA achieves an accelerating gradient 1.2 larger than TESLA-like standing-wave cavities. In addition, the STWA allows longer acceleration cavities, reducing the number of gaps between them. However, the STWA structure requires a SC feedback waveguide to return the few hundreds of MW of circulating RF power from the structure output to the structure input. A test single-cell cavity with feedback was designed and manufactured to demonstrate the possibility of proper processing to achieve a high accelerating gradient. The first results of high-gradient tests of a prototype 1.3 GHz single-cell cavity with feedback waveguide will be presented.

Yakovlev, V.; Solyak, N.; Wu, G.; Ge, M.; Gonin, I.; Khabiboulline, T.; Ozelis, J.; Rowe, A. [Fermilab, Batavia, IL 60510 (United States); Avrakhov, P.; Kanareykin, A. [Euclid TechLabs, LLC, Solon, Ohio 44139 (United States); Rathke, J. [AES, Medford, NY 11763 (United States)

2010-11-04T23:59:59.000Z

297

Toward photostable multiplex analyte detection on a single mode planar optical waveguide  

SciTech Connect (OSTI)

We have developed a waveguide-based optical biosensor for the sensitive and specific detection of biomarkers associated with disease. Our technology combines the superior optical properties of single-mode planar waveguides, the robust nature of functionalized self-assembled monolayer sensing films and the specificity of fluorescence sandwich immunoassays to detect biomarkers in complex biological samples such as serum, urine and sputum. We have previously reported the adaptation of our technology to the detection of biomarkers associated with breast cancer and anthrax. However, these approaches primarily used phospholipid bilayers as the functional film and organic dyes (ex: AlexaFluors) as the fluorescence reporter. Organic dyes are easily photodegraded and are not amenable to multiplexing because of their narrow Stokes' shift. Here we have developed strategies for conjugation of the detector antibodies with quantum dots for use in a multiplex detection platform. We have previously evaluated dihydroxylipoic acid quantum dots for the detection of a breast cancer biomarker. In this manuscript, we investigate the detection of the Bacillus anthracis protective antigen using antibodies conjugated with polymer-coated quantum dots. Kinetics of binding on the waveguide-based biosensor is reported. We compare the sensitivity of quantum dot labeled antibodies to those labeled with AlexaFluor and demonstrate the photostability of the former in our assay platform. In addition, we compare sulfydryl labeling of the antibody in the hinge region to that of nonspecific amine labeling. This is but the first step in developing a multiplex assay for such biomarkers on our waveguide platform.

Mukundan, Harshini [Los Alamos National Laboratory; Xei, Hongshi [Los Alamos National Laboratory; Anderson, Aaron S [Los Alamos National Laboratory; Grace, Wynne K [Los Alamos National Laboratory; Martinez, Jennifer S [NON LANL; Swanson, Basil [Los Alamos National Laboratory

2009-01-01T23:59:59.000Z

298

Reactive-coupling-induced normal mode splittings in microdisk resonators coupled to waveguides  

SciTech Connect (OSTI)

We study the optomechanical design introduced by M. Li et al. [Phys. Rev. Lett. 103, 223901 (2009)], which is very effective for investigation of the effects of reactive coupling. We show the normal mode splitting that is due solely to reactive coupling rather than due to dispersive coupling. We suggest feeding the waveguide with a pump field along with a probe field and scanning the output probe for evidence of reactive-coupling-induced normal mode splitting.

Huang Sumei; Agarwal, G. S. [Department of Physics, Oklahoma State University, Stillwater, Oklahoma 74078 (United States)

2010-05-15T23:59:59.000Z

299

CdTe OPTICAL WAVEGUIDE MODULATORS (*) D. L. SPEARS and A. J. STRAUSS  

E-Print Network [OSTI]

401 CdTe OPTICAL WAVEGUIDE MODULATORS (*) D. L. SPEARS and A. J. STRAUSS Lincoln Laboratory guides d'ondes opto-acoustiques et opto-électriques ont été réalisés dans des guides d'ondes n-/n+ CdTe-électriques de faible tension ont été réalisés en appliquant des électrodes en or sur des plaquettes n+ de CdTe

Paris-Sud XI, Université de

300

The development of microstrip to dielectric waveguide transitions and beam steering techniques  

E-Print Network [OSTI]

REFERENCES 54 55 58 APPENDIX A TRANSMISSION LOSS FOR DIFFERENT FOIL LENGTHS . . B ANTENNA PATTERNS AT DIFFERENT FREQUENCIES. . . 62 80 VITA 102 LIST OF FIGURES Figure Page 1 Microstrip waveguide. 2 Electric and magnetic flelds on a microstrip. 3... domain with discontinuities caused by: 1) HP8510 to SMA coaxial, 2) SMA coaxial to microstrip, 3) microstrip to dielectric (interface), 4) end of foil on dielectric 24 12 Foil shape that produced the lowest insertion loss. 25 13 Transition loss at 11...

Miller, Jeffrey Allen

2012-06-07T23:59:59.000Z

Note: This page contains sample records for the topic "nonlinear waveguides view" 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

The Hybrid Integration of Arsenic Trisulfide and Lithium Niobate Optical Waveguides by Magnetron Sputtering.  

E-Print Network [OSTI]

on-chip gain is 1.2 plus/minus 0.1 dB/cm. The internal gain measured for a transverse electric propagation in an 7 ?m wide Er:Ti:LiNbO3 waveguide amplifier is 1.8 dB plus/minus 0.1 dB and is among the highest reported in the literature. These gains...

Tan, Wee Chong

2012-07-16T23:59:59.000Z

302

Proceeding of the International Conference on Nonlinear Evolution ...  

E-Print Network [OSTI]

Proceeding of the International Conference on Nonlinear Evolution Partial. Differential Equations, June 1993, Beijing, China. NONLINEAR GALERKIN METHOD.

303

A nonlinear relativistic approach to mathematical representation of vacuum electromagnetism based on extended Lie derivative  

E-Print Network [OSTI]

This paper presents an alternative {\\it relativistic nonlinear} approach to the vacuum case of classical electrodynamics. Our view is based on the understanding that the corresponding differential equations should be dynamical in nature. So, they must represent local energy-momentum balance relations. Formally, the new equations are in terms of appropriately extended Lie derivative of $\\mathbb{R}^2$-valued differential 2-form along a $\\mathbb{R}^2$-valued 2-vector on Minkowski space-time.

Stoil Donev; Maria Tashkova

2014-02-21T23:59:59.000Z

304

The Better Buildings Neighborhood View- October 2012  

Broader source: Energy.gov [DOE]

The Better Buildings Neighborhood View monthly newsletter from the U.S. Department of Energy's Better Buildings Neighborhood Program - October 2012

305

Fibrations and universal view updatability Michael Johnson  

E-Print Network [OSTI]

Fibrations and universal view updatability Michael Johnson Computing Department, Macquarie methods to manage the complexity. Dampney and Johnson [25] first showed how data models based on entity

Johnson, Michael

306

Fibrations and universal view updatability Michael Johnson  

E-Print Network [OSTI]

Fibrations and universal view updatability Michael Johnson Computing Department, Macquarie and Johnson [25] first showed how data models based on entity-relationship (ER) diagrams [10] are enhanced

Rosebrugh, Robert

307

Nonlinear Electrodynamics of Superconducting Films  

Science Journals Connector (OSTI)

Microwave-transmission measurements at 9.4 Gc/sec over a wide range of incident power have been used to study the nonlinear electrodynamics of thin superconducting films. By measuring the amplitude and phase of the fundamental transmitted field, the contributions of superelectrons and normal electrons to the electrodynamics of the films have been determined. In low microwave fields the nonlinear behavior of the films can be attributed to the breakup of superconducting pairs in agreement with the Ginzberg-Landau theory. In high microwave fields, regions of normal resistance appear through which a dc bias current cannot avoid passing. Most of the third-harmonic power is generated by these resistive regions.

K. Rose and M. D. Sherrill

1966-05-06T23:59:59.000Z

308

Fiber Laser Based Nonlinear Spectroscopy  

E-Print Network [OSTI]

illumination into the smallest focal volume possible in order to achieve the best resolution and to maximize nonlinear response. The size of the focal volume depends on the numerical aperture (NA) of the lens and the quality of the lens backfill... to refer to any cone-shaped propagating light field, in which case the medium will be assumed to be air. The backfill characteristic of a laser and lens combination must be considered because the beam generally has a Gaussian mode profile...

Adany, Peter

2012-08-31T23:59:59.000Z

309

Nonlinear subcritical magnetohydrodynamic beta limit  

SciTech Connect (OSTI)

Published gyrokinetic simulations have had difficulty operating beyond about half the ideal magnetohydrodynamic (MHD) critical beta limit with stationary and low transport levels in some well-established reference cases. Here it is demonstrated that this limitation is unlikely due to numerical instability, but rather appears to be a nonlinear subcritical MHD beta limit[R. E. Waltz, Phys. Rev. Lett. 55, 1098 (1985)] induced by the locally enhanced pressure gradients from the diamagnetic component of the nonlinearly driven (zero frequency) zonal flows. Strong evidence that the zonal flow corrugated pressure gradient profiles can act as a MHD-like beta limit unstable secondary equilibrium is provided. It is shown that the addition of sufficient ExB shear or operation closer to drift wave instability threshold, thereby reducing the high-n drift wave turbulence nonlinear pumping of the zonal flows, can allow the normal high-n ideal MHD beta limit to be reached with low transport levels. Example gyrokinetic simulations of experimental discharges are provided: one near the high-n beta limit reasonably matches the low transport levels needed when the high experimental level of ExB shear is applied; a second experimental example at moderately high beta appears to be limited by the subcritical beta.

Waltz, R. E. [General Atomics, P.O. Box 85608, San Diego, California 92186-5608 (United States)

2010-07-15T23:59:59.000Z

310

Type-II quasi phase matching in periodically intermixed semiconductor superlattice waveguides  

E-Print Network [OSTI]

. Many semicon- ductors have nonlinear optical susceptibilities with values well in excess of conventional materials, such as lithium niobate. Semiconductors have an addi- tional advantage

311

A Long View Of The Energy Market  

Science Journals Connector (OSTI)

A Long View Of The Energy Market ... Billionaire philanthropist and Microsoft Chairman Bill Gates and Nobel Prize-winning physicist and Energy Secretary Steven Chu hold similar views on the importance of finding new sources of inexpensive energy to better the plight of the world’s poor—as well as to make money. ...

JEFF JOHNSON

2012-03-19T23:59:59.000Z

312

User_Sup_ViewEmpMatrix  

Broader source: Energy.gov (indexed) [DOE]

an Employee Matrix (Supervisor) an Employee Matrix (Supervisor) © 2011 SuccessFactors, Inc. - 1 - SuccessFactors Learning Confidential. All rights reserved. Job Aid: Viewing an Employee Matrix (Supervisor) Purpose The purpose of this job aid is to guide supervisor users through the step-by-step process of viewing an employee matrix within SuccessFactors Learning. Task A. View an Employee Matrix From the Home page, click the My Employees tab. Click the Employee Matrix supervisor link. Click the Change Measures expand arrow ( ) to select criteria for comparison. View an Employee Matrix 8 Steps Task A 3 3 1 1 2 2 SuccessFactors Learning v 6.4 User Job Aid Viewing an Employee Matrix (Supervisor) © 2011 SuccessFactors, Inc. - 2 - SuccessFactors Learning Select a measure for the

313

Mountain View Grand | Open Energy Information  

Open Energy Info (EERE)

Grand Grand Jump to: navigation, search Name Mountain View Grand Facility Mountain View Grand Sector Wind energy Facility Type Small Scale Wind Facility Status In Service Owner Mountain View Grand Developer Sustainable Energy Developments Energy Purchaser Mountain View Grand Location Mountain View Grand Resort & Spa NH Coordinates 44.397987°, -71.590306° 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":44.397987,"lon":-71.590306,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

314

Directional nanophotonic atom--waveguide interface based on spin--orbit interaction of light  

E-Print Network [OSTI]

Optical waveguides in the form of glass fibers are the backbone of global telecommunication networks. In such optical fibers, the light is guided over long distances by continuous total internal reflection which occurs at the interface between the fiber core with a higher refractive index and the lower index cladding. Although this mechanism ensures that no light escapes from the waveguide, it gives rise to an evanescent field in the cladding. While this field is protected from interacting with the environment in standard optical fibers, it is routinely employed in air- or vacuum-clad fibers in order to efficiently couple light fields to optical components or emitters using, e.g., tapered optical fiber couplers. Remarkably, the strong confinement imposed by the latter can lead to significant coupling of the light's spin and orbital angular momentum. Taking advantage of this effect, we demonstrate the controlled directional spontaneous emission of light by quantum emitters into a sub-wavelength-diameter waveguide. The effect is investigated in a paradigmatic setting, comprising cesium atoms which are located in the vicinity of a vacuum-clad silica nanofiber. We experimentally observe an asymmetry higher than 10:1 in the emission rates into the counterpropagating fundamental guided modes of the nanofiber. Moreover, we demonstrate that this asymmetry can be tailored by state preparation and suitable excitation of the quantum emitters. We expect our results to have important implications for research in nanophotonics and quantum optics and for implementations of integrated optical signal processing in the classical as well as in the quantum regime.

R. Mitsch; C. Sayrin; B. Albrecht; P. Schneeweiss; A. Rauschenbeutel

2014-06-20T23:59:59.000Z

315

Nonlinear  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

magnetic axis out- ward and is largely poloidal over most of the plasma volume. Toroidal electric field from standard Ohmic induction there- fore drives current in the plasma core...

316

Nonlinear structural crack growth monitoring  

DOE Patents [OSTI]

A method and apparatus are provided for the detection, through nonlinear manipulation of data, of an indicator of imminent failure due to crack growth in structural elements. The method is a process of determining energy consumption due to crack growth and correlating the energy consumption with physical phenomena indicative of a failure event. The apparatus includes sensors for sensing physical data factors, processors or the like for computing a relationship between the physical data factors and phenomena indicative of the failure event, and apparatus for providing notification of the characteristics and extent of such phenomena.

Welch, Donald E. (Oak Ridge, TN); Hively, Lee M. (Philadelphia, TN); Holdaway, Ray F. (Clinton, TN)

2002-01-01T23:59:59.000Z

317

A model of nonlinear electrodynamics  

E-Print Network [OSTI]

A new model of nonlinear electrodynamics with two parameters is investigated. There is no the effect of vacuum birefringence in this model. It was shown that the electric field of a point-like charge is not singular at the origin that results to the finiteness of the static electric energy. We obtain the canonical and symmetrical Belinfante energy-momentum tensors and dilatation current. It is demonstrated that the dilatation symmetry and dual symmetry are broken in the model suggested. We have calculated the static electric energy of point-like particles.

S. I. Kruglov

2014-09-30T23:59:59.000Z

318

A model of nonlinear electrodynamics  

E-Print Network [OSTI]

A new model of nonlinear electrodynamics with two parameters is investigated. There is no the effect of vacuum birefringence in this model. It was shown that the electric field of a point-like charge is not singular at the origin that results to the finiteness of the static electric energy. We obtain the canonical and symmetrical Belinfante energy-momentum tensors and dilatation current. It is demonstrated that the dilatation symmetry is broken but the dual symmetry takes place in the model suggested. We have calculated the static electric energy of point-like particles.

Kruglov, S I

2014-01-01T23:59:59.000Z

319

Engineering Giant Nonlinearities in Quantum Nanosystems  

E-Print Network [OSTI]

We describe a method to engineer giant nonlinearities in, and probes to measure nonlinear observables of, mesoscopic quantum resonators. This involves tailoring the Hamiltonian of a simple auxiliary system perturbatively coupled to the resonator, and has the potential to engineer a wide range of nonlinearities to high accuracy. We give a number of explicit examples, including a readily realizable two-qubit auxiliary system that creates an x^4 potential and a Chi^(3) (Kerr) nonlinearity, valid to fifth-order in the perturbative coupling.

Kurt Jacobs; Andrew Landahl

2009-08-06T23:59:59.000Z

320

Nonlinear optical protection against frequency agile lasers  

SciTech Connect (OSTI)

An eye-protection or equipment-filter device for protection from laser energy is disclosed. The device may be in the form of a telescope, binoculars, goggles, constructed as part of equipment such as image intensifiers or range designators. Optical elements focus the waist of the beam within a nonlinear frequency-doubling crystal or nonlinear optical element or fiber. The nonlinear elements produce a harmonic outside the visible spectrum in the case of crystals, or absorb the laser energy in the case of nonlinear fibers. Embodiments include protectors for the human eye as well as filters for sensitive machinery such as TV cameras, FLIR systems or other imaging equipment.

McDowell, V.P.

1988-08-04T23:59:59.000Z

Note: This page contains sample records for the topic "nonlinear waveguides view" 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

SOLVING SYSTEMS OF NONLINEAR EQUATIONS WITH ...  

E-Print Network [OSTI]

Nov 2, 2006 ... an exothermic first-order irreversible reaction. When certain variables are eliminated, the model results in a system of two nonlinear equations.

2006-11-02T23:59:59.000Z

322

Detonator comprising a nonlinear transmission line  

DOE Patents [OSTI]

Detonators are described herein. In a general embodiment, the detonator includes a nonlinear transmission line that has a variable capacitance. Capacitance of the nonlinear transmission line is a function of voltage on the nonlinear transmission line. The nonlinear transmission line receives a voltage pulse from a voltage source and compresses the voltage pulse to generate a trigger signal. Compressing the voltage pulse includes increasing amplitude of the voltage pulse and decreasing length of the voltage pulse in time. An igniter receives the trigger signal and detonates an explosive responsive to receipt of the trigger signal.

Elizondo-Decanini, Juan M

2014-12-30T23:59:59.000Z

323

A Framework for Nonlinear Filtering in MATLAB.  

E-Print Network [OSTI]

?? The object of this thesis is to provide a MATLAB framework for nonlinear filtering in general, and particle filtering in particular. This is done… (more)

Rosén, Jakob

2005-01-01T23:59:59.000Z

324

Nonlinear conformation of secondary protein folding  

E-Print Network [OSTI]

A model to describe the mechanism of conformational dynamics in secondary protein based on matter interactions is proposed. The approach deploys the lagrangian method by imposing certain symmetry breaking. The protein backbone is initially assumed to be nonlinear and represented by the Sine-Gordon equation, while the nonlinear external bosonic sources is represented by $\\phi^4$ interaction. It is argued that the nonlinear source induces the folding pathway in a different way than the previous work with initially linear backbone. Also, the nonlinearity of protein backbone decreases the folding speed.

Januar, M; Handoko, L T

2012-01-01T23:59:59.000Z

325

sequential quadratic progamming methods for parametric nonlinear ...  

E-Print Network [OSTI]

against several other approaches for nonlinear model predictive control of a hydro .... ticular, for small perturbations of an NLP, the optimal inactive constraints

2014-07-02T23:59:59.000Z

326

Single-ion nonlinear mechanical oscillator  

SciTech Connect (OSTI)

We study the steady-state motion of a single trapped ion oscillator driven to the nonlinear regime. Damping is achieved via Doppler laser cooling. The ion motion is found to be well described by the Duffing oscillator model with an additional nonlinear damping term. We demonstrate here the unique ability of tuning both the linear as well as the nonlinear damping coefficients by controlling the laser-cooling parameters. Our observations pave the way for the investigation of nonlinear dynamics on the quantum-to-classical interface as well as mechanical noise squeezing in laser-cooling dynamics.

Akerman, N.; Kotler, S.; Glickman, Y.; Dallal, Y.; Keselman, A.; Ozeri, R. [Physics of Complex Systems, Weizmann Institute of Science, Rehovot 76100 (Israel)

2010-12-15T23:59:59.000Z

327

Development of Nonlinear SSI Time Domain Methodology  

Broader source: Energy.gov [DOE]

Development of Nonlinear SSI Time Domain Methodology Justin Coleman, P.E. Nuclear Science and Technology Idaho National Laboratory October 22, 2014

328

Extension of Coupled-Modes Method to Waveguides with Elastic Bottom  

SciTech Connect (OSTI)

In this paper, the coupled-modes method of acoustic propagation is extended to waveguides with smoothly varying fluid-elastic interfaces. To formulate the problem without recourse to the SH wave component from the ground up, we employ the {l_brace}u{sub z},u{sub v{r_brace}}-formulation developed in seismology. The result is remarkably different from that for fluid-fluid interfaces; the boundary conditions imposed at fluid-elastic interfaces give rise to terms including unknown boundary values so that the differential system obtained is not closed. To make the system closed, additional compatibility and constraining conditions have to be imposed.

Wang Ning; Wang Haozhong; Gao Dazhi [Department of Physics, Ocean University of China, 238 Songling Rd. Qingdao (China)

2010-09-06T23:59:59.000Z

329

Spin-wave excitation and propagation in microstructured waveguides of yttrium iron garnet/Pt bilayers  

SciTech Connect (OSTI)

We present an experimental study of spin-wave excitation and propagation in microstructured waveguides consisting of a 100?nm thick yttrium iron garnet/platinum (Pt) bilayer. The life time of the spin waves is found to be more than an order of magnitude higher than in comparably sized metallic structures, despite the fact that the Pt capping enhances the Gilbert damping. Utilizing microfocus Brillouin light scattering spectroscopy, we reveal the spin-wave mode structure for different excitation frequencies. An exponential spin-wave amplitude decay length of 31??m is observed which is a significant step towards low damping, insulator based micro-magnonics.

Pirro, P.; Chumak, A. V.; Lägel, B.; Leven, B.; Hillebrands, B. [Fachbereich Physik and Landesforschungszentrum OPTIMAS, Technische Universität Kaiserslautern, D-67663 Kaiserslautern (Germany)] [Fachbereich Physik and Landesforschungszentrum OPTIMAS, Technische Universität Kaiserslautern, D-67663 Kaiserslautern (Germany); Brächer, T. [Fachbereich Physik and Landesforschungszentrum OPTIMAS, Technische Universität Kaiserslautern, D-67663 Kaiserslautern (Germany) [Fachbereich Physik and Landesforschungszentrum OPTIMAS, Technische Universität Kaiserslautern, D-67663 Kaiserslautern (Germany); Graduate School Materials Science in Mainz, Gottlieb-Daimler-Strasse 47, D-67663 Kaiserslautern (Germany); Dubs, C.; Surzhenko, O.; Görnert, P. [Innovent e.V., Prüssingstraße 27B, 07745 Jena (Germany)] [Innovent e.V., Prüssingstraße 27B, 07745 Jena (Germany)

2014-01-06T23:59:59.000Z

330

Lake View Geothermal Facility | Open Energy Information  

Open Energy Info (EERE)

Page Page Edit with form History Facebook icon Twitter icon » Lake View Geothermal Facility Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Lake View Geothermal Facility General Information Name Lake View Geothermal Facility Facility Lake View Sector Geothermal energy Location Information Location The Geysers, California Coordinates 38.823527148671°, -122.78173327446° 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":38.823527148671,"lon":-122.78173327446,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

331

Berkeley Lab View -- March 28, 2008  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

March 28th, 2008 Search the View Archive March 28th, 2008 Search the View Archive State of the Lab: New Initiatives, Construction Daniel Chemla (1940-2008): A Remembrance of His Career The View is Going Green DOE Excellence Award to Foundry Project Team Berkeley Lab View Here Comes BELLA: The BErkeley Lab Laser Acceleration Project Berkeley Lab Science Roundup State of the Lab: New Initiatives, Construction By Lynn Yarris image Photo by Roy Kaltschmidt, CSO Free electron lasers with attosecond capabilities, a high-energy electron accelerator less than a meter in length, the arrival of NERSC-6 and the departure of GELCO-4 were some of the highlights of Berkeley Lab Director Steve Chu's State-of-the-Lab address, which he delivered at the Building 50 Auditorium during the noon hour on March 10, with simulcast to the

332

JOBAID-VIEWING AN EMPLOYEE MATRIX (SUPERVISOR)  

Broader source: Energy.gov [DOE]

The purpose of this job aid is to guide supervisor users through the step-by-step process of viewing an employee matrix within SuccessFactors Learning.

333

Incorporating video into Google Mobile Street View  

E-Print Network [OSTI]

Mobile Street View is a compelling application but suffers from significant latency problems, especially in limited bandwidth circumstances. Currently, the application uses static images to display street level information. ...

Wright, Christina (Christina E.)

2010-01-01T23:59:59.000Z

334

1,425 Views Healthcare Technology  

E-Print Network [OSTI]

Molecules into Targeted Cells (/healthtech/1863- nanotechnology/6022- researchers;NANOTECHNOLOGY (/HEALTHTECH/1863-NANOTECHNOLOGY) May 22, 2013 View Comments (/healthtech/1863-nanotechnology/6022, diagnostics, and drug delivery toward the promise of personalized medicine." A paper describing the research

Espinosa, Horacio D.

335

Nonlinear Spectroscopy of Trapped Ions  

E-Print Network [OSTI]

Nonlinear spectroscopy employs a series of laser pulses to interrogate dynamics in large interacting many-body systems, and has become a highly successful method for experiments in chemical physics. Current quantum optical experiments approach system sizes and levels of complexity which require the development of efficient techniques to assess spectral and dynamical features with scalable experimental overhead. However, established methods from optical spectroscopy of macroscopic ensembles cannot be applied straightforwardly to few-atom systems. Based on the ideas proposed in [M. Gessner et al. New J. Phys. 16 092001 (2014)], we develop a diagrammatic approach to construct nonlinear measurement protocols for controlled quantum systems and discuss experimental implementations with trapped ion technology in detail. These methods in combination with distinct features of ultra-cold matter systems allow us to monitor and analyze excitation dynamics in both the electronic and vibrational degrees of freedom. They are independent of system size, and can therefore reliably probe systems where, e.g., quantum state tomography becomes prohibitively expensive. We propose signals that can probe steady state currents, detect the influence of anharmonicities on phonon transport, and identify signatures of chaotic dynamics near a quantum phase transition in an Ising-type spin chain.

Frank Schlawin; Manuel Gessner; Shaul Mukamel; Andreas Buchleitner

2014-10-07T23:59:59.000Z

336

Jefferson and Hamilton as viewed by historians  

E-Print Network [OSTI]

JEFFERSON AND HAMILTON AS VIEHED BY HISTORIANS A Thesis Paul Edward Jungmeyer Submitted to the Graduate College of Texas A&M University in ' partial fulfillment of the requirement for the degree of MASTER OF ARTS August, 1970 Major Subject...: History JEFFERSON AND HAMILTON AS VIEWED BY HISTORIANS A Thesis by Paul Edward Jungmeyer Approved as to style and content by: (Chairman of Committee d i~) (Member) (M er) August, 1970 ABSTRACT JEFFERSON AND HAMILTON AS VIEWED BY HISTORIANS...

Jungmeyer, Paul Edward

2012-06-07T23:59:59.000Z

337

Nonlinear physics of shear Alfvén waves  

SciTech Connect (OSTI)

Shear Alfvén waves (SAW) play fundamental roles in thermonuclear plasmas of fusion interest, since they are readily excited by energetic particles in the MeV range as well as by the thermal plasma components. Thus, understanding fluctuation induced transport in burning plasmas requires understanding nonlinear SAW physics. There exist two possible routes to nonlinear SAW physics: (i) wave-wave interactions and the resultant spectral energy transfer; (ii) nonlinear wave-particle interactions of SAW instabilities with energetic particles. Within the first route, it is advantageous to understand and describe nonlinear processes in term of proximity of the system to the Alfvénic state, where wave-wave interactions are minimized due to the cancellation of Reynolds and Maxwell stresses. Here, various wave-wave nonlinear dynamics are elucidated in terms of how they break the Alfvénic state. In particular, we discuss the qualitative and quantitative modification of the SAW parametric decay process due to finite ion compressibility and finite ion Larmor radius. We also show that toroidal geometry plays a crucial role in the nonlinear excitation of zonal structures by Alfvén eigenmodes. Within the second route, the coherent nonlinear dynamics of structures in the energetic particle phase space, by which secular resonant particle transport can occur on meso- and macro-scales, must be addressed and understood. These 'nonlinear equilibria' or 'phase-space zonal structures' dynamically evolve on characteristic (fluctuation induced) turbulent transport time scales, which are generally of the same order of the nonlinear time scale of the underlying fluctuations. In this work, we introduce the general structure of nonlinear Schrödinger equations with complex integro-differential nonlinear terms, which govern these physical processes. To elucidate all these aspects, theoretical analyses are presented together with numerical simulation results.

Zonca, Fulvio [Associazione EURATOM-ENEA sulla Fusione, C.P. 65-00044 Frascati, Italy and Institute for Fusion Theory and Simulation, Zhejiang University, Hangzhou 31007 (China); Chen, Liu [Institute for Fusion Theory and Simulation, Zhejiang University, Hangzhou 31007, P.R.C. and Department of Physics and Astronomy, University of California, Irvine, CA 92697 (United States)

2014-02-12T23:59:59.000Z

338

Calculation of coupling to slow and fast waves in the LHRF from phased waveguide arrays  

SciTech Connect (OSTI)

A previously reported algorithm for solving the problem of coupling electromagnetic energy in the LHRF from a phased array of identical rectangular waveguides to a plane-stratified, magnetized cold plasma is numerically implemented. The resulting computer codes are sufficiently general to allow for an arbitrary number of waveguides with finite dimensions in both poloidal and toroidal directions, and are thus capable of computing coupling to both slow and fast waves in the plasma. Some of the details of the implementation and the extension of the algorithm to allow study of the Fourier spectrum of slow and fast waves launched by the array are discussed. Good agreement is found with previously reported, less general work for the slow wave launching case. The effect of phasing multirow arrays in the poloidal direction is studied, and an asymmetry between phasing 'up' and 'down' is found that persists in the case where the plasma adjacent to the array is uniform. A 4 x 3 array designed to launch fast waves of high phase velocity is studied. By using the optimal poloidal phasing, low reflection coefficients (absolute value of R/sup 2/ less than or equal to 20%) are found under some not unrealistic edge plasma conditions, but most of the input power is trapped in the outermost layer of the plasma. Implications of our results for fast wave current drive experiments are discussed.

Pinsker, R.I.; Duvall, R.E.; Fortgang, C.M.; Colestock, P.L.

1986-04-01T23:59:59.000Z

339

LATERAL VEHICLE STABILIZATION USING CONSTRAINED NONLINEAR CONTROL  

E-Print Network [OSTI]

problems of designing a controller for the yaw dynamics are the nonlinearities which appear in the system, nonlinear systems, constraints. Abstract A lateral stabilization system for automotive vehicles is de of the vehicle during braking maneuvers. These systems were followed by traction control systems, which im- prove

Johansen, Tor Arne

340

Generating nonlinear FM chirp waveforms for radar.  

SciTech Connect (OSTI)

Nonlinear FM waveforms offer a radar matched filter output with inherently low range sidelobes. This yields a 1-2 dB advantage in Signal-to-Noise Ratio over the output of a Linear FM waveform with equivalent sidelobe filtering. This report presents design and implementation techniques for Nonlinear FM waveforms.

Doerry, Armin Walter

2006-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "nonlinear waveguides view" 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

Nonlinear Dark-Field Microscopy Hayk Harutyunyan,  

E-Print Network [OSTI]

/20/2010 Published on Web: 11/16/2010 FIGURE 1. Illustration of the nonlinear dark-field imaging method. Two incidentNonlinear Dark-Field Microscopy Hayk Harutyunyan, Stefano Palomba, Jan Renger, Romain Quidant Dark-field microscopy is a background-free imaging method that provides high sensitivity and a large

Novotny, Lukas

342

Nonlinearity in modal and vibration testing.  

SciTech Connect (OSTI)

This set of slides describes some aspects of nonlinear Vibration analysis thru use of analytical fromulas and Examples from real or simulated test systems . The Systems are drawn from a set of examples based on Years of vibration testing experience . Both traditional and new methods are used to describe nonlinear vibration.

Hunter, N. F. (Norman F.)

2003-01-01T23:59:59.000Z

343

Nonlinear Lattice Waves in Random Potentials  

E-Print Network [OSTI]

Localization of waves by disorder is a fundamental physical problem encompassing a diverse spectrum of theoretical, experimental and numerical studies in the context of metal-insulator transition, quantum Hall effect, light propagation in photonic crystals, and dynamics of ultra-cold atoms in optical arrays. Large intensity light can induce nonlinear response, ultracold atomic gases can be tuned into an interacting regime, which leads again to nonlinear wave equations on a mean field level. The interplay between disorder and nonlinearity, their localizing and delocalizing effects is currently an intriguing and challenging issue in the field. We will discuss recent advances in the dynamics of nonlinear lattice waves in random potentials. In the absence of nonlinear terms in the wave equations, Anderson localization is leading to a halt of wave packet spreading. Nonlinearity couples localized eigenstates and, potentially, enables spreading and destruction of Anderson localization due to nonintegrability, chaos and decoherence. The spreading process is characterized by universal subdiffusive laws due to nonlinear diffusion. We review extensive computational studies for one- and two-dimensional systems with tunable nonlinearity power. We also briefly discuss extensions to other cases where the linear wave equation features localization: Aubry-Andre localization with quasiperiodic potentials, Wannier-Stark localization with dc fields, and dynamical localization in momentum space with kicked rotors.

Sergej Flach

2014-09-10T23:59:59.000Z

344

Optimization and Nonlinear Gordon K. Smyth  

E-Print Network [OSTI]

Optimization and Nonlinear Equations Gordon K. Smyth in Encyclopedia of Biostatistics (ISBN 0471;Optimization and Nonlinear Equations Optimization means finding that value of x which maximizes or minimizes a given function f (x). The idea of optimization goes to the heart of statistical methodology

Smyth, Gordon K.

345

Statistical Emulator Construction for Nonlinear Smart Systems  

E-Print Network [OSTI]

efficient surrogates for nonlinear smart material models. We will primarily focus on emulators ferroelectric materials ideal components of a number of smart systems [3]. For example, polyvinylidene fluorideStatistical Emulator Construction for Nonlinear Smart Systems Francesca D. Reale1 and Ralph C

346

Non-linear Seismic Soil Structure Interaction Method for Developing...  

Office of Environmental Management (EM)

Contact - Sliding and Separation Non-linear springs * Material ElasticPlastic * Non-linear soil behavior * Non-linear behavior between soil and structure (i.e. the...

347

Nonlinear lower hybrid modeling in tokamak plasmas  

SciTech Connect (OSTI)

We present here new results concerning the nonlinear mechanism underlying the observed spectral broadening produced by parametric instabilities occurring at the edge of tokamak plasmas in present day LHCD (lower hybrid current drive) experiments. Low frequency (LF) ion-sound evanescent modes (quasi-modes) are the main parametric decay channel which drives a nonlinear mode coupling of lower hybrid (LH) waves. The spectrum of the LF fluctuations is calculated here considering the beating of the launched LH wave at the radiofrequency (RF) operating line frequency (pump wave) with the noisy background of the RF power generator. This spectrum is calculated in the frame of the kinetic theory, following a perturbative approach. Numerical solutions of the nonlinear LH wave equation show the evolution of the nonlinear mode coupling in condition of a finite depletion of the pump power. The role of the presence of heavy ions in a Deuterium plasma in mitigating the nonlinear effects is analyzed.

Napoli, F.; Schettini, G. [Università Roma Tre, Dipartimento di Ingegneria, Roma (Italy); Castaldo, C.; Cesario, R. [Associazione EURATOM/ENEA sulla Fusione, Centro Ricerche Frascati (Italy)

2014-02-12T23:59:59.000Z

348

Non-linear Seismic Soil Structure Interaction Method for Developing Nonlinear Seismic SSI  

Broader source: Energy.gov (indexed) [DOE]

Linear Seismic Soil Structure Interaction (SSI) Linear Seismic Soil Structure Interaction (SSI) Method for Developing Non-Linear Seismic SSI Analysis Techniques Justin Coleman, P.E. October 25th, 2011 E102003020BDS Presentation Outline  Purpose of Presentation  Linear versus Non-Linear Seismic SSI  Non-Linear seismic Soil Structure Interaction (NLSSI) Studies  The NLSSI Introduction  Non-Linearity in Seismic SSI Analysis  Commercial Software Elements  Commercial Software Non-Linear Constitutive Models  Non-Linear Seismic SSI Damping  Demonstration of Time Domain 2D Model  NLSSI Validation Approach  NLSSI Implementation  Need For NLSSI  Conclusions E102003020BDS Purpose of Presentation  The purpose of the presentation is to establish the need for using non-linear analysis

349

342 IEEE PHOTONICS TECHNOLOGY LETTERS, VOL. 19, NO. 5, MARCH 1, 2007 Thermooptically Tuned Photonic Crystal Waveguide  

E-Print Network [OSTI]

(e-mail: chen@ece.utexas.edu). W. Jiang is with Omega Optics Inc., Austin, TX 78758 USA. Color crystal waveguide (PCW) [10]. The reported PCW-based TO MZI em- ployed a historically traditional thermal Center, Department of Electrical and Computer Engineering, The University of Texas, Austin, TX 78758 USA

Chen, Ray

350

Mid-Infrared Spectrometer Using Opto-Nanofluidic Slot-Waveguide for Label-Free On-Chip Chemical Sensing  

E-Print Network [OSTI]

, provides a unique platform for chemical detection. KEYWORDS: Midinfrared, opto-nanofluidics, onMid-Infrared Spectrometer Using Opto-Nanofluidic Slot-Waveguide for Label-Free On-Chip Chemical Avenue, Cambridge, Massachusetts 02139, United States Department of Chemistry and Chemical Biology

Heller, Eric

351

WAVEGUIDE BROAD-WALL COUPLING FOR RF GUNS Leon C.-L. Lin, S. C. Chen, and J. S. Wurtele  

E-Print Network [OSTI]

approximation and appropriate Green's functions. (4) The dipole radiation is used to calculate the reflection problem shown in Fig. 1. The RF energy is coupled into the cavity through two apertures which are assumed and the cavity. These tensors are readily obtained from the Green's functionsof the waveguide and pillboxcavities

Wurtele, Jonathan

352

Planar optical waveguide based sandwich assay sensors and processes for the detection of biological targets including early detection of cancers  

DOE Patents [OSTI]

An assay element is described including recognition ligands adapted for binding to carcinoembryonic antigen (CEA) bound to a film on a single mode planar optical waveguide, the film from the group of a membrane, a polymerized bilayer membrane, and a self-assembled monolayer containing polyethylene glycol or polypropylene glycol groups therein and an assay process for detecting the presence of CEA is described including injecting a possible CEA-containing sample into a sensor cell including the assay element, maintaining the sample within the sensor cell for time sufficient for binding to occur between CEA present within the sample and the recognition ligands, injecting a solution including a reporter ligand into the sensor cell; and, interrogating the sample within the sensor cell with excitation light from the waveguide, the excitation light provided by an evanescent field of the single mode penetrating into the biological target-containing sample to a distance of less than about 200 nanometers from the waveguide thereby exciting any bound reporter ligand within a distance of less than about 200 nanometers from the waveguide and resulting in a detectable signal.

Martinez, Jennifer S. (Santa Fe, NM); Swanson, Basil I. (Los Alamos, NM); Shively, John E. (Arcadia, CA); Li, Lin (Monrovia, CA)

2009-06-02T23:59:59.000Z

353

Electra-optic and all-optical phase modulator on an indium tin oxide single-mode waveguide  

E-Print Network [OSTI]

O, films are widely used in solar energy conversion, in optoelectronics, and in other branches demonstrated an In,O,:Sn semiconductor thin-film waveguide. The energy gap of the film can be manipulated from of optical wavelengths to be multiplexed with the carrier signal. The index of refraction of the Inz

Chen, Ray

354

Athermal Characteristics of TiO2-Clad Silicon Waveguides at 1.3m , K. Shang1  

E-Print Network [OSTI]

into the inverse taper coupler on the silicon photonic waveguide. The thermo-electric cooler (TEC) mounts. Bovington2 , R. Wu2 , K-T. Cheng2 , J. E. Bowers2 and S.J.B. Yoo1,* , 1Department of Electrical & Computer Engineering, University of California, Davis, California, USA 2 Department of Electrical & Computer

Liebling, Michael

355

Athermal Characteristics of TiO2-Clad Silicon Waveguides at 1.3m , K. Shang1  

E-Print Network [OSTI]

into the inverse taper coupler on the silicon photonic waveguide. The thermo-electric cooler (TEC) mounts. Bovington2 , R. Wu2 , K-T. Cheng2 , J. E. Bowers2 and S.J.B. Yoo1,* , 1Department of Electrical & Computer Engineering, University of California, Davis, California, USA 2Department of Electrical & Computer Engineering

Yoo, S. J. Ben

356

Planar waveguide obtained by burying a Ge22As20Se58 fiber in As2S3 glass  

E-Print Network [OSTI]

Planar waveguide obtained by burying a Ge22As20Se58 fiber in As2S3 glass Quentin Coulombier glasses. Two highly mature chalcogenide glasses are used for these experiments. GASIR glass from Umicore IR Glass, Olen, Belgium, with the composition of Ge22As20Se58 is used to draw fibers

Paris-Sud XI, Université de

357

Better Buildings Network View | January 2014 | Department of...  

Broader source: Energy.gov (indexed) [DOE]

January 2014 Better Buildings Network View | January 2014 The Better Buildings Network View monthly newsletter from the U.S. Department of Energy's Better Buildings Residential...

358

Better Buildings Network View | March 2014 | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

March 2014 Better Buildings Network View | March 2014 The Better Buildings Network View monthly newsletter from the U.S. Department of Energy's Better Buildings Residential...

359

Better Buildings Network View | May 2014 | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

May 2014 Better Buildings Network View | May 2014 The Better Buildings Network View monthly newsletter from the U.S. Department of Energy's Better Buildings Residential Network....

360

Better Buildings Network View | September 2014 | Department of...  

Broader source: Energy.gov (indexed) [DOE]

September 2014 Better Buildings Network View | September 2014 The Better Buildings Network View monthly newsletter from the U.S. Department of Energy's Better Buildings Residential...

Note: This page contains sample records for the topic "nonlinear waveguides view" 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

Better Buildings Network View | February 2014 | Department of...  

Broader source: Energy.gov (indexed) [DOE]

February 2014 Better Buildings Network View | February 2014 The Better Buildings Network View monthly newsletter from the U.S. Department of Energy's Better Buildings Residential...

362

Better Buildings Network View | June 2014 | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

June 2014 Better Buildings Network View | June 2014 The Better Buildings Network View monthly newsletter from the U.S. Department of Energy's Better Buildings Residential Network....

363

Non-Linear Seismic Soil Structure Interaction (SSI) Method for Developing Non-Linear Seismic SSI Analysis Techniques  

Broader source: Energy.gov [DOE]

Non-Linear Seismic Soil Structure Interaction (SSI) Method for Developing Non-Linear Seismic SSI Analysis Techniques Justin Coleman, P.E. October 25th, 2011

364

Valley View Wind Farm | Open Energy Information  

Open Energy Info (EERE)

Wind Farm Wind Farm Jump to: navigation, search Name Valley View Wind Farm Facility Valley View Sector Wind energy Facility Type Commercial Scale Wind Facility Status In Service Owner Juhl Wind Developer Valley View Transmission Energy Purchaser Xcel Energy Location Outside Chandler MN Coordinates 43.905808°, -96.020508° 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":43.905808,"lon":-96.020508,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

365

Business Apps List View | Data.gov  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Apps List View Apps List View BusinessUSA Data/Tools Apps Challenges Let's Talk BusinessUSA You are here Data.gov » Communities » BusinessUSA List View Showing 1 - 12 of 12 results. Resources sort ascending Type Last Updated On Traveling Entrepreneur Find green government opportunities for small businesses. The app based on your current location retrieves all the government programs and then allows you to share your favorite program on Facebook. Mobile 02/01/2012 Small Business Toolkit Small Business Toolbox provides a way to easily keep up-to-date on government programs, grants, awards, solicitations, and small business programs. Find the closest SBA district office, easily gathering license and permit information. Mobile 01/31/2012 SBIR.gov Awards Search This app allows users to search the SBIR awards database by agency, keyword, and year.

366

states apps list view | Data.gov  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

states apps list view states apps list view States Data Apps Challenges Policies States You are here Data.gov » Communities » States List View Showing 1 - 5 of 5 results. Resources sort ascending Type Last Updated On TrashBackwards Trash Backwards will connect you with current recycling information, Do It Yourself reuse and upcycle tutorials that are easy to follow, reliable articles and infographics, upcycled products and durable alternatives to common single-use items, and links to non-profits and other groups who will benefit greatly from the stuff you're done with. Currently includes Massachusetts and Washington. Apps 02/27/2013 MoDOT's Traveler Information Map App With the launch of MoDOT's new Traveler Information Map mobile app, Missouri travelers can get the latest information on road conditions, work zones, flooding and incidents on their iPhones and Androids. Mobile 05/22/2013

367

Secular free solution up to third order of the nonlinear equation \\(\  

Science Journals Connector (OSTI)

The perturbation method of Lindstedt is applied to study the nonlinear effect of a nonlinear equation $$\

Sudhansu Kumar Chandra

1974-04-01T23:59:59.000Z

368

Toto the Robot Figure 1. Toto, front view. Figure 2. Toto, rear view.  

E-Print Network [OSTI]

Toto the Robot Figure 1. Toto, front view. Figure 2. Toto, rear view. Toto the Robot was created so in the back to allow the tape- recorder to be held inside, and the figure was spray-painted. With his metallic a robot, helps account for his lack of verbal charm. Second, some younger children may recognize in Toto

Indiana University

369

A H-infinity Fault Detection and Diagnosis Scheme for Discrete Nonlinear System Using Output Probability Density Estimation  

SciTech Connect (OSTI)

In this paper, a H-infinity fault detection and diagnosis (FDD) scheme for a class of discrete nonlinear system fault using output probability density estimation is presented. Unlike classical FDD problems, the measured output of the system is viewed as a stochastic process and its square root probability density function (PDF) is modeled with B-spline functions, which leads to a deterministic space-time dynamic model including nonlinearities, uncertainties. A weighting mean value is given as an integral function of the square root PDF along space direction, which leads a function only about time and can be used to construct residual signal. Thus, the classical nonlinear filter approach can be used to detect and diagnose the fault in system. A feasible detection criterion is obtained at first, and a new H-infinity adaptive fault diagnosis algorithm is further investigated to estimate the fault. Simulation example is given to demonstrate the effectiveness of the proposed approaches.

Zhang Yumin; Lum, Kai-Yew [Temasek Laboratories, National University of Singapore, Singapore 117508 (Singapore); Wang Qingguo [Depa. Electrical and Computer Engineering, National University of Singapore, Singapore 117576 (Singapore)

2009-03-05T23:59:59.000Z

370

Nonlinear time-fractional dispersive equations  

E-Print Network [OSTI]

In this paper we study some cases of time-fractional nonlinear dispersive equations (NDEs) involving Caputo derivatives, by means of the invariant subspace method. This method allows to find exact solutions to nonlinear time-fractional partial differential equations by separating variables. We first consider a third order time-fractional NDE that admits a four-dimensional invariant subspace and we find a similarity solution. We also study a fifth order NDE. In this last case we find a solution involving Mittag-Leffler functions. We finally observe that the invariant subspace method permits to find explicit solutions for a wide class of nonlinear dispersive time-fractional equations.

P. Artale Harris; R. Garra

2014-10-29T23:59:59.000Z

371

Mean, variance, and temporal coherence of the 3D acoustic field forward propagated through random inhomogeneities in continental-shelf and deep ocean waveguides  

E-Print Network [OSTI]

When an acoustic field propagates through a multimodal waveguide, the effect of variations in medium properties induced by 3D random inhomogeneities accumulates by multiple forward scattering over range. This causes ...

Chen, Tianrun

2009-01-01T23:59:59.000Z

372

Experimental trial of a hollow-core waveguide used as an absorption cell for concentration measurement of NH3 gas with a CO2 laser  

Science Journals Connector (OSTI)

The basic idea of using a hollow-core waveguide as an absorption cell in a spectroscopic gas measurement system is proposed. Measurements of NH3 gas concentration were made...

Saito, Yasunori; Kanaya, Tatsunori; Nomura, Akio; Kano, Tetsuo

1993-01-01T23:59:59.000Z

373

Time-Domain Absorbing Boundary Terminations for Waveguide Ports Based on State-Space Models  

E-Print Network [OSTI]

Absorbing boundary conditions for waveguide ports in time domain are important elements of transient approaches to treat RF structures. A successful way to implement these termination conditions is the decomposition of the transient fields in the absorbing plane in terms of modal field patterns. The absorbing condition is then accomplished by transferring the wave impedances (or admittances) of the modes to time domain, which leads to convolution operations involving Bessel functions and integrals of Bessel functions. This paper presents a new alternative approach: the convolution operations are approximated by appropriate state-space models whose system responses can be conveniently computed by standard integration schemes. These schemes are indispensable for transient simulations anyhow. Sufficiently far away from the cutoff frequency, a wideband match is achieved.

Flisgen, T; van Rienen, U

2014-01-01T23:59:59.000Z

374

High-performance 3D waveguide architecture for astronomical pupil-remapping interferometry  

E-Print Network [OSTI]

The detection and characterisation of extra-solar planets is a major theme driving modern astronomy, with the vast majority of such measurements being achieved by Doppler radial-velocity and transit observations. Another technique -- direct imaging -- can access a parameter space that complements these methods, and paves the way for future technologies capable of detailed characterization of exoplanetary atmospheres and surfaces. However achieving the required levels of performance with direct imaging, particularly from ground-based telescopes which must contend with the Earth's turbulent atmosphere, requires considerable sophistication in the instrument and detection strategy. Here we demonstrate a new generation of photonic pupil-remapping devices which build upon the interferometric framework developed for the {\\it Dragonfly} instrument: a high contrast waveguide-based device which recovers robust complex visibility observables. New generation Dragonfly devices overcome problems caused by interference from...

Norris, Barnaby; Gross, Simon; Jovanovic, Nemanja; Stewart, Paul N; Charles, Ned; Lawrence, Jon S; Withford, Michael J; Tuthill, Peter

2014-01-01T23:59:59.000Z

375

Bismuth ferrite as low-loss switchable material for plasmonic waveguide modulator  

E-Print Network [OSTI]

We propose new designs of plasmonic modulators, which can be utilized for dynamic signal switching in photonic integrated circuits. We study performance of plasmonic waveguide modulator with bismuth ferrite as an active material. The bismuth ferrite core is sandwiched between metal plates (metal-insulator-metal configuration), which also serve as electrodes so that the core changes its refractive index under applied voltage by means of partial in-plane to out-of-plane reorientation of ferroelectric domains in bismuth ferrite. This domain switch results in changing of propagation constant and absorption coefficient, and thus either phase or amplitude control can be implemented. Efficient modulation performance is achieved because of high field confinement between the metal layers, as well as the existence of mode cut-offs for particular values of the core thickness, making it possible to control the signal with superior modulation depth. For the phase control scheme, {\\pi} phase shift is provided by 0.8-{\\mu}m...

Babicheva, Viktoriia E; Lavrinenko, Andrei V

2014-01-01T23:59:59.000Z

376

Electromagnetic field of a charge intersecting a cold plasma boundary in a waveguide  

SciTech Connect (OSTI)

We analyze the electromagnetic field of a charge crossing a boundary between a vacuum and cold plasma in a waveguide. We obtain exact expressions for the field components and the spectral density of the transition radiation. With the steepest descent technique, we investigate the field components. We show that the electromagnetic field has a different structure in a vacuum than in cold plasma. We also develop an algorithm for the computation of the field based on a certain transformation of the integration path. The behavior of the field depending on distance and time and the spectral density depending on frequency are explored for different charge velocities. Some important physical effects are noted. A considerable increase and concentration of the field near the wave front in the plasma is observed for the case of ultrarelativistic particles. In the plasma, the mode envelopes and spectral density show zero points when the charge velocity is within certain limits.

Alekhina, Tatiana Yu.; Tyukhtin, Andrey V. [Radiophysics Department of St. Petersburg University, 1 Ulyanovskaya, St. Petersburg 198504 (Russian Federation)

2011-06-15T23:59:59.000Z

377

Functional composites of plasmas and metamaterials: Flexible waveguides, and variable attenuators with controllable phase shift  

SciTech Connect (OSTI)

Numerical predictions and experimental results in this study verify that plasmas with negative permittivity work as functional media for electromagnetic waves and that their composites with metallic metamaterials show further extraordinary properties. Chain structures of individual plasmas with negative permittivity, forming a straight line and a L-shaped bent line, serve flexible waveguides via coupling structures of localized surface waves standing around each plasma. Further progresses as wave controllers are achievable in an array of the composites of plasmas and micro metallic resonators; functions of phase shifters and attenuators are individually controlled, with rotation of working points on the complex refractive index plane by varying gas conditions and permeability modulation. Such proposed sets of flexible combination will lead to advanced scientific products with novel functions.

Sakai, Osamu; Maeda, Jun; Shimomura, Takuya [Department of Electronic Science and Engineering, Kyoto University, Kyoto-daigaku Katsura, Nishikyo-ku, Kyoto 615-8510 (Japan)] [Department of Electronic Science and Engineering, Kyoto University, Kyoto-daigaku Katsura, Nishikyo-ku, Kyoto 615-8510 (Japan); Urabe, Keiichiro [Department of Electronic Science and Engineering, Kyoto University, Kyoto-daigaku Katsura, Nishikyo-ku, Kyoto 615-8510 (Japan) [Department of Electronic Science and Engineering, Kyoto University, Kyoto-daigaku Katsura, Nishikyo-ku, Kyoto 615-8510 (Japan); Department of Advanced Materials Science, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa-shi, Chiba 277-8561 (Japan)

2013-07-15T23:59:59.000Z

378

Mode propagation and absorption loss in metal-clad periodic optical waveguides  

SciTech Connect (OSTI)

In terms of the mode eigenvalue equations are field distributions, calculations are performed for Au/InGaAsP/InP, air/Au/InGaAsP/InP, and Au/DiO{sub 2}InGaAsP/InP periodic optical waveguides. On the basis of the computed results, the coupling property in the periodic structure is analyzed, the mode split and the mode band formation of both TE and TM guided modes are described, and the effects of the thickness of the metal cladding and the oxide buffer layer on mode propagation and absorption loss are discussed for TE and TM guided modes as well as for the TM surface-plasma mode. Furthermore, the conversion from the surface-plasma wave to the guided wave for the TM mode is explained for Au/SiO{sub 2}/InGaAsP/InP periodic structures. 27 refs., 8 figs.

Chunsheng Ma [Jilin Univ., Changchun (China)

1996-02-01T23:59:59.000Z

379

Reflection resonances in surface-disordered waveguides: strong higher-order effects of the disorder  

E-Print Network [OSTI]

We study coherent wave scattering through waveguides with a step-like surface disorder and find distinct enhancements in the reflection coefficients at well-defined resonance values. Based on detailed numerical and analytical calculations, we can unambiguously identify the origin of these reflection resonances to be higher-order correlations in the surface disorder profile which are typically neglected in similar studies of the same system. A remarkable feature of this new effect is that it relies on the longitudinal correlations in the step profile, although individual step heights are random and thus completely uncorrelated. The corresponding resonances are very pronounced and robust with respect to ensemble averaging, and lead to an enhancement of wave reflection by more than one order of magnitude.

J. Doppler; J. A. Méndez-Bermúdez; J. Feist; O. Dietz; D. O. Krimer; N. M. Makarov; F. M. Izrailev; S. Rotter

2013-12-28T23:59:59.000Z

380

Copper waveguide cavities with reduced surface loss for coupling to superconducting qubits  

E-Print Network [OSTI]

Significant improvements in superconducting qubit coherence times have been achieved recently with three-dimensional microwave waveguide cavities coupled to transmon qubits. While many of the measurements in this direction have utilized superconducting aluminum cavities, other recent work has involved qubits coupled to copper cavities with coherence times approaching 0.1 ms. The copper provides a good path for thermalizing the cavity walls and qubit chip, although the substantial cavity loss makes conventional dispersive qubit measurements challenging. We are exploring various approaches for improving the quality factor of three-dimensional copper cavities, including electropolishing and coating with superconducting layers of tin. We have characterized these cavities on multiple cooldowns and found the tin-plating to be robust. In addition, we have performed coherence measurements on transmon qubits in these cavities and observed promising performance.

Daniela F. Bogorin; D. T. McClure; Matthew Ware; B. L. T. Plourde

2014-09-10T23:59:59.000Z

Note: This page contains sample records for the topic "nonlinear waveguides view" 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

Global Food Security Programme Exploring public views  

E-Print Network [OSTI]

Global Food Security Programme ­ Exploring public views #12;©TNS June 2012 -1- Executive Summary significant public policy issues of this century. This scoping study for the Global Food Security programme. The project involved a total of 44 people in a two stage workshop process in London, Edinburgh and Aberystwyth

382

Evolution of self-incompatibility: Early Views  

E-Print Network [OSTI]

Evolution of self-incompatibility: Early Views: Whitehouse (1950): 1. Sudden rise of angiosperms by Whitehouse (1950). Isolation of components of the self-incompatibilities paved the way to study the evolution of SIs Matton et al. (1994): Molecular data supports Bateman. Three self-incompatibility systems

Bhattacharyya, Madan Kumar

383

CITY OF MOUNTAIN VIEW April 12, 2011 .  

E-Print Network [OSTI]

Ordinance ordinance? Projected effective date: September 1, 2011 Green building or stand-alone energy Energy Ordinance in Combination with Green Building ordinance? Do minimum energy requirements increase No afterCITY OF MOUNTAIN VIEW April 12, 2011 . CaUfomia Energy Commission Attn: Joe Loyer 1516 Ninth

384

Friction in full view A. P. Merklea  

E-Print Network [OSTI]

Friction in full view A. P. Merklea and L. D. Marksb Materials Science and Engineering proposed friction mechanisms explaining the unique tribological properties of graphite. Wear of graphite chemical or struc- tural information from the interface during a friction experi- ment. Examples

Marks, Laurence D.

385

Enlightening News and Views FM Employees  

E-Print Network [OSTI]

FM Light Enlightening News and Views From & For FM Employees November 17, 2011 Department Christmas Social Events Scholarship Winner Mechanical Rooms Clean-up Letters Let's Talk Shop SPAN on your big win Sheri! Christmas Social Events NAPE 7801 Dinner and Dance will be held at the Legion

deYoung, Brad

386

Enlightening News and Views FM Employees  

E-Print Network [OSTI]

FM Light Enlightening News and Views From & For FM Employees March 11, 2011 Department or five families have a better Christmas. Above from left to right are Yvette Walton of SPAN and Kim Wal-Mart gift certificates to the Christmas Pro- gram of The Salvation Army in December. The Salvation

deYoung, Brad

387

INVESTIGATION Retrospective View of North American Potato  

E-Print Network [OSTI]

INVESTIGATION Retrospective View of North American Potato (Solanum tuberosum L.) Breeding in the 20, Madison, Wisconsin, 53706 ABSTRACT Cultivated potato (Solanum tuberosum L.), a vegetatively propagated explore the effects of potato breeding at the genome level, we used 8303 single-nucleotide polymorphism

Douches, David S.

388

Year in Review 2007 GoddardView  

E-Print Network [OSTI]

Year in Review 2007 GoddardView National Aeronautics and Space Administration www.nasa.gov Volume 4, to stunning images from the highest-resolution satellite data products ever realized, to a visit from Security staff did a marvelous job in planning and coordinating the efforts of at least six different

Christian, Eric

389

A theory of two-beam acceleration of charged particles in a plasma waveguide  

SciTech Connect (OSTI)

The progress made in recent years in the field of high-current relativistic electron beam (REB) generation has aroused a considerable interest in studying REB potentialities for charged particle acceleration with a high acceleration rate T = 100MeV/m. It was proposed, in particular, to employ high-current REB in two-beam acceleration schemes (TBA). In these schemes high current REB (driving beam) excites intense electromagnetic waves in the electrodynamic structure which, in their turn, accelerate particles of the other beam (driven beam). The TBA schemes can be divided into two groups. The first group includes the schemes, where the two beams (driving and driven) propagate in different electrodynamic structures coupled with each other through the waveguides which ensure the microwave power transmission to accelerate driven beam particles. The second group includes the TBA schemes, where the driving and driven beams propagate in one electrodynamic structure. The main aim of this work is to demonstrate by theory the possibility of realizing effectively the TBA scheme in the plasma waveguide. The physical model of the TBA scheme under study is formulated. A set of equations describing the excitation of RF fields by a high-current REB and the acceleration of driven beam electrons is also derived. Results are presented on the the linear theory of plasma wave amplification by the driving beam. The range of system parameters, at which the plasma-beam instability develops, is defined. Results of numerical simulation of the TBA scheme under study are also presented. The same section gives the description of the dynamics of accelerated particle bunching in the high-current REB-excited field. Estimates are given for the accelerating field intensities in the plasma and electron acceleration rates.

Ostrovsky, A.O. [Kharkov Inst. of Physics and Technology (Ukraine)

1993-11-01T23:59:59.000Z

390

Exponential Attractor for a Nonlinear Boussinesq Equation  

Science Journals Connector (OSTI)

This paper is devoted to prove the existence of an exponential attractor for the semiflow generated by a nonlinear Boussinesq equation. We formulate the Boussinesq equation as an abstract equation in the... ...

Ahmed Y. Abdallah

2006-07-01T23:59:59.000Z

391

ORC Seminar Series Presents: "Nonlinear laser lithography  

E-Print Network [OSTI]

ORC Seminar Series Presents: "Nonlinear laser lithography: formation of self-authored 50 journal and more than 150 conference papers and he has given more than 100 invited talks. http://www.orc

Anderson, Jim

392

Extraordinary nonlinear plasmonics in graphene nanoislands  

E-Print Network [OSTI]

Nonlinear optical processes rely on the intrinsically weak interactions between photons enabled by their coupling with matter. Unfortunately, many applications in nonlinear optics are severely hindered by the small response of conventional materials. Metallic nanostructures partially alleviate this situation, as the large light enhancement associated with their localized plasmons amplifies their nonlinear response to record high levels. Graphene hosts long-lived, electrically tunable plasmons that also interact strongly with light. Here we show that the nonlinear polarizabilities of graphene nanoislands can be electrically tuned to surpass by several orders of magnitude those of metal nanoparticles of similar size. This extraordinary behavior extends over the visible and near-infrared for islands consisting of hundreds of carbon atoms doped with moderate carrier densities. Our quantum-mechanical simulations of the plasmon-enhanced optical response of nanographene reveal this material as an ideal platform for ...

Cox, Joel D

2014-01-01T23:59:59.000Z

393

Nonlinear multiferroic phase shifters for microwave frequencies  

SciTech Connect (OSTI)

A nonlinear microwave phase shifter based on a planar multiferroic composite has been studied. The multiferroic structure is fabricated in the form of a bilayer consisting of yttrium iron garnet and barium strontium titanate. The principle of operation of the device is based on the linear and nonlinear control of the phase shift of the hybrid spin-electromagnetic waves propagating in the bilayer. The linear control is realized with magnetic and electric fields. The nonlinear control is provided by the input power of microwave signal. The device showed a nonlinear phase shift up to 250°, electric field induced phase shift up to 330°, and magnetic field induced phase shift of more than 180°.

Ustinov, Alexey B.; Kalinikos, Boris A. [Department of Physical Electronics and Technology, St. Petersburg Electrotechnical University, St. Petersburg 197376 (Russian Federation); Srinivasan, G. [Department of Physics, Oakland University, Rochester, Michigan 48309 (United States)

2014-02-03T23:59:59.000Z

394

Acoustic nonlinearity in fluorinert FC-43  

SciTech Connect (OSTI)

Fluorinert FC-43 nonlinearity was investigated using two approaches: (i) a finite amplitude method with harmonic production; and (ii) a nonlinear frequency mixing in the fluid with consequent beam profile measurement of the difference frequency. The finite amplitude method provides information on the coefficient of nonlinearity, {beta}, through the amplitudes of the fundamental and the second harmonic, at a certain transmitter-receiver distance. A calibrated hydrophone was used as a receiver, in order to obtain direct pressure measurements of the acoustic waves in the fluid. The role of transmitter-receiver distance in {beta} determination is investigated. In the second approach, a single transducer is used to provide two high-frequency beams. The collinear high-frequency beams mix nonlinearly in the fluid resulting in a difference frequency beam and higher order harmonics of the primaries. The difference frequency beam profite is investigated at lengths beyond the mixing distance. The experimental data are compured with the KZK theory.

Pantea, Cristian [Los Alamos National Laboratory; Sinha, Dipen N [Los Alamos National Laboratory; Osterhoudt, Curtis F [Los Alamos National Laboratory; Mombourquette, Paul C [Los Alamos National Laboratory

2009-01-01T23:59:59.000Z

395

Rotating black string with nonlinear source  

SciTech Connect (OSTI)

In this paper, we derive rotating black string solutions in the presence of two kinds of nonlinear electromagnetic fields, so-called Born-Infeld and power Maxwell invariant. Investigation of the solutions show that for the Born-Infeld black string the singularity is timelike and the asymptotic behavior of the solutions is anti-de Sitter, but for power Maxwell invariant solutions, depending on the values of nonlinearity parameter, the singularity may be timelike as well as spacelike and the solutions are not asymptotically anti-de Sitter for all values of the nonlinearity parameter. Next, we calculate the conserved quantities of the solutions by using the counterterm method, and find that these quantities do not depend on the nonlinearity parameter. We also compute the entropy, temperature, the angular velocity, the electric charge, and the electric potential of the solutions, in which the conserved and thermodynamics quantities satisfy the first law of thermodynamics.

Hendi, S. H. [Physics Department, College of Sciences, Yasouj University, Yasouj 75914 (Iran, Islamic Republic of); Research Institute for Astrophysics and Astronomy of Maragha (RIAAM), P.O. Box 55134-441, Maragha (Iran, Islamic Republic of) and National Elite Foundation, P.O. Box 19615-334, Tehran (Iran, Islamic Republic of)

2010-09-15T23:59:59.000Z

396

Generalized Nonlinear Balance Criteria and Inertial Stability  

Science Journals Connector (OSTI)

The connections between the concept of nonlinear balance and the classical criterion of inertial stability are explored in the context of historical work on this subject. New analytic results are derived establishing that ellipticity and inertial ...

John A. Knox

1997-04-01T23:59:59.000Z

397

Nonlinear parameter estimation in parallel computing environments  

E-Print Network [OSTI]

This thesis examines issues related to the paralielization of PESTI a parameter estimation code which was originally developed by Dr. A. T. Watson. PEST is based on the trust region implementation of Levenberg-Marquardt nonlinear least square...

Li, Jie

2012-06-07T23:59:59.000Z

398

Time-Dependent Nonlinear Hadley Circulation  

Science Journals Connector (OSTI)

The time-dependent Hadley circulation is studied numerically in a nonlinear, nearly inviscid, axially symmetric primitive equation model, with the heating varying periodically on an annual cycle. The annual average of the Hadley circulation ...

Ming Fang; Ka Kit Tung

1999-06-01T23:59:59.000Z

399

Nonlinear Gravitational Clustering in Expanding Universe  

E-Print Network [OSTI]

The gravitational clustering of collisionless particles in an expanding universe is modelled using some simple physical ideas. I show that it is possible to understand the nonlinear clustering in terms of three well defined regimes: (1) linear regime; (2) quasilinear regime which is dominated by scale-invariant radial infall and (3) nonlinear regime dominated by nonradial motions and mergers. Modelling each of these regimes separately I show how the nonlinear two point correlation function can be related to the linear correlation function in hierarchical models. This analysis leads to results which are in good agreement with numerical simulations thereby providing an explanation for numerical results. Using this model and some simple extensions, it is possible to understand the transfer of power from large to small scales and the behaviour of higher order correlation functions. The ideas presented here will also serve as a powerful analytical tool to investigate nonlinear clustering in different models.

T. Padmanabhan

1996-07-19T23:59:59.000Z

400

Energy balance in linear and nonlinear waves  

Science Journals Connector (OSTI)

We give a quantitative meaning to the often-used expression: in spatial solitons, diffraction is balanced by nonlinear refractive-index effects. After pointing out how the electric...

Ansari, Nadeem; Pask, Colin

2001-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "nonlinear waveguides view" 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

Extreme events in discrete nonlinear lattices  

E-Print Network [OSTI]

We perform statistical analysis on discrete nonlinear waves generated though modulational instability in the context of the Salerno model that interpolates between the intergable Ablowitz-Ladik (AL) equation and the nonintegrable discrete nonlinear Schrodinger (DNLS) equation. We focus on extreme events in the form of discrete rogue or freak waves that may arise as a result of rapid coalescence of discrete breathers or other nonlinear interaction processes. We find power law dependence in the wave amplitude distribution accompanied by an enhanced probability for freak events close to the integrable limit of the equation. A characteristic peak in the extreme event probability appears that is attributed to the onset of interaction of the discrete solitons of the AL equation and the accompanied transition from the local to the global stochasticity monitored through the positive Lyapunov exponent of a nonlinear map.

A. Maluckov; Lj. Hadzievski; N. Lazarides; G. P. Tsironis

2009-01-22T23:59:59.000Z

402

Robust design of nonlinear internal models without adaptation  

Science Journals Connector (OSTI)

We propose a solution to the problem of semiglobal output regulation for nonlinear minimum-phase systems driven by uncertain exosystems that does not rely upon conventional adaptation schemes to estimate the frequency of the exogenous signals. Rather, ... Keywords: Nonlinear internal model principle, Nonlinear observers, Nonlinear output regulation, Robust control

Alberto Isidori; Lorenzo Marconi; Laurent Praly

2012-10-01T23:59:59.000Z

403

The Nonlinear Essence of Gravitational Waves  

E-Print Network [OSTI]

A critical review of gravitational wave theory is made. It is pointed out that the usual linear approach to the gravitational wave theory is neither conceptually consistent nor mathematically justified. Relying upon that analysis it is then argued that -- analogously to a Yang-Mills propagating field, which must be nonlinear to carry its gauge charge -- a gravitational wave must necessarily be nonlinear to transport its own charge -- that is, energy-momentum.

R. Aldrovandi; J. G. Pereira; K. H. Vu

2007-09-11T23:59:59.000Z

404

Nonlinear Gyrokinetic Simulations of Ion-Temperature-Gradient Turbulence for the Optimized Wendelstein 7-X Stellarator  

SciTech Connect (OSTI)

Ion-temperature-gradient turbulence constitutes a possibly dominant transport mechanism for optimized stellarators, in view of the effective suppression of neoclassical losses characterizing these devices. Nonlinear gyrokinetic simulation results for the Wendelstein 7-X stellarator [G. Grieger et al., in Proceedings of the IAEA Conference on Plasma Physics and Controlled Nuclear Fusion Research, 1990 (IAEA, Vienna, 1991) Vol. 3, p. 525]--assuming an adiabatic electron response--are presented. Several fundamental features are discussed, including the role of zonal flows for turbulence saturation, the resulting flux-gradient relationship, and the coexistence of ion-temperature-gradient modes with trapped ion modes in the saturated state.

Xanthopoulos, P. [Max-Planck-Institut fuer Plasmaphysik, Teilinstitut Greifswald, Wendelsteinstrasse 1, D-17491 Greifswald (Germany); Merz, F.; Goerler, T.; Jenko, F. [Max-Planck-Institut fuer Plasmaphysik, Boltzmannstrasse 2, D-85748 Garching (Germany)

2007-07-20T23:59:59.000Z

405

Nonlinear reduction of high-dimensional dynamical systems via neural networks  

Science Journals Connector (OSTI)

A technique for empirically determining optimal coordinates for modeling a dynamical system is presented. The methodology may be viewed as a nonlinear extension of the Karhunen-Loève procedure and is implemented via an autoassociative neural network. Given a high-dimensional system of differential equations which model a dynamical system asymptotically residing on a stable attractor, the task of the network is to compute a reembedding of the attractor and the dynamics into an ambient space which reflects the intrinsic dimensionality of the problem. The method is demonstrated on the unforced Van der Pol oscillator, the forced Van der Pol, and the Kuramoto-Sivashinsky equation.

Michael Kirby and Rick Miranda

1994-03-21T23:59:59.000Z

406

Chaotifying Continuous-Time Nonlinear Autonomous Systems  

E-Print Network [OSTI]

Based on the principle of chaotification for continuous-time autonomous systems, which relies on two basic properties of chaos, i.e., globally bounded with necessary positive-zero-negative Lyapunov exponents, this paper derives a feasible and unified chaotification method of designing a general chaotic continuous-time autonomous nonlinear system. For a system consisting of a linear and a nonlinear subsystem, chaotification is achieved using separation of state variables, which decomposes the system into two open-loop subsystems interacting through mutual feedback resulting in an overall closed-loop nonlinear feedback system. Under the condition that the nonlinear feedback control output is uniformly bounded where the nonlinear function is of bounded-input/bounded-output, it is proved that the resulting system is chaotic in the sense of being globally bounded with a required placement of Lyapunov exponents. Several numerical examples are given to verify the effectiveness of the theoretical design. Since linear systems are special cases of nonlinear systems, the new method is also applicable to linear systems in general.

Simin Yu; Guanrong Chen

2012-03-27T23:59:59.000Z

407

Demonstration of a vapor density monitoring system using UV radiation generated from quasi-phasematched SHG waveguide devices  

SciTech Connect (OSTI)

Many industrial applications require non-intrusive diagnostics for process monitoring and control. One example is the physical vapor deposition of titanium alloys. In this paper we present a system based on laser absorption spectroscopy for monitoring titanium vapor. Appropriate transitions for monitoring high rate vaporization of titanium require extension of available IR diode technology to the UV. The heart of this vapor density monitoring system is the 390nm radiation generated from quasi-phase matched interactions within periodically poled waveguides. In this paper, key system components of a UV laser absorption spectroscopy based system specific for titanium density monitoring are described. Analysis is presented showing the minimum power levels necessary from the ultraviolet laser source. Performance data for prototype systems using second harmonic generation (SHG) waveguide technology is presented. Application of this technology to other alloy density monitoring systems is discussed.

Galanti, S.A.; Berzins, L.V.; Brown, J.B.; Tamosaitis, R.S.; Bortz, M.L.; Day, T.; Fejer, M.M.; Wang, W.

1996-01-29T23:59:59.000Z

408

Direct measurement of proton-beam-written polymer optical waveguide sidewall morphorlogy using an atomic force microscope  

SciTech Connect (OSTI)

Proton-beam writing (PBW) is a direct-write micromachining technique capable of fabricating low-loss single-mode polymer waveguides with straight and smooth sidewalls. Recently, the sidewall morphologies of such proton beam written polymer waveguide structures were directly measured using an atomic force microscope (AFM). Statistical information such as the rms roughness and the correlation length of the sidewall profile obtained from the AFM scans allows us to quantify the quality of the sidewalls and optimize the fabrication parameters using PBW. For structures fabricated using a stage scanning speed of {approx}10 {mu}m/s, a rms roughness of 3.8{+-}0.3 nm with a correlation length of 46{+-}6 nm was measured.

Sum, T.C.; Bettiol, A.A.; Seng, H.L.; Kan, J.A. van; Watt, F. [Department of Physics Centre for Ion Beam Applications (CIBA), National University of Singapore, 2 Science Drive 3, Singapore 117542 (Singapore)

2004-08-23T23:59:59.000Z

409

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

410

SOAJ Search : Main View : Deep Federated Search  

Office of Scientific and Technical Information (OSTI)

SOAJ Search SOAJ Search Search Powered By Deep Web Technologies New Search Preferences Powered by Deep Web Technologies HOME ABOUT ADVANCED SEARCH CONTACT US HELP Science Open Access Journals (SOAJ) Science Open Access Journals Main View This view is used for searching all possible sources. Additional Information Keyword: Title: Additional Information Author: Fields to Match: All Any Field(s) Additional Information Date Range: Beginning Date Range Pick Year 2013 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 2000 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990 toEnding Date Range Pick Year 2013 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 2000 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990 DWT Logo Search Clear All Help Simple Search Select All

411

Reasearch apps list view | Data.gov  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Reasearch apps list view Reasearch apps list view Research Menu Data/Tools Apps Resources Let's Talk Research Alpha You are here Data.gov » Communities » Research Applications Showcase Showing 1 - 6 of 6 results. Resources sort ascending Type Last Updated On Wireless Spectrum Research & Development Senior Steering Group's Testbed Information Portal The Wireless Spectrum Research & Development Senior Steering Group's Testbed Information Portal provides information about spectrum testing facilities to government, academic, and industry researchers in need of such facilities. Apps 11/20/2012 The R&D Dashboard The R&D Dashboard beta website provides an initial look at U.S. Federal investments in science and research from two agencies: the National Institutes of Health (NIH) and the National Science Foundation (NSF) from years 2000-2009. The R&D Dashboard will expand in a future iteration to include ALL Federal research and development spending and expanded information on outputs. Apps 11/20/2012

412

consumer apps list view | Data.gov  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

consumer apps list view consumer apps list view Consumer Data Apps Challenges Resources About Blogs Let's Talk Feedback Consumer You are here Data.gov » Communities » Consumer Smart Disclosure Apps This page highlights apps and websites that use Smart Disclosure-style data to empower consumers to make better informed choices. The purpose is to illustrate the kinds of innovative apps-web- and mobile-based-that Smart Disclosure can fuel. The galleries below include both government-produced apps and apps created by innovators outside government that have won Federal challenges. Showing 1 - 19 of 19 results. Resources sort ascending Type Last Updated On Smart Traveler Smart Traveler, the official State Department app for U.S. travelers, invites you to see the world with easy access to frequently updated official country information, travel alerts, travel warnings, maps, U.S. embassy locations, and more. Mobile 09/14/2012

413

Nonlinear Dynamics of Single Bunch Instability  

SciTech Connect (OSTI)

A nonlinear equation is derived that governs the evolution of the amplitude of unstable oscillations with account of quantum diffusion effects due to the synchrotron radiation. Numerical solutions to this equation predict a variety of possible scenarios of nonlinear evolution of the instability some of which are in good qualitative agreement with experimental observations. Microwave single bunch instability in circular accelerators has been observed in many machines. The instability usually arises when the number of particles in the bunch exceeds some critical value, Nc, which varies depending on the parameters of the accelerating regime. Recent observations on the SLC damping rings at SLAC with a new low-impedance vacuum chamber revealed new interesting features of the instability. In some cases, after initial exponential growth, the instability eventually saturated at a level that remained constant through the accumulation cycle. In other regimes, relaxation-type oscillations were measured in nonlinear phase of the instability. In many cases, the instability was characterized by a frequency close to the second harmonic of the synchrotron oscillations. Several attempts have been made to address the nonlinear stage of the instability based on either computer simulations or some specific assumptions regarding the structure of the unstable mode. An attempt of a more general consideration of the problem is carried out in this paper. We adopt an approach recently developed in plasma physics for analysis of nonlinear behavior of weakly unstable modes in dynamic systems. Assuming that the growth rate of the instability is much smaller than its frequency, we find a time dependent solution to Vlasov equation and derive an equation for the complex amplitude of the oscillations valid in the nonlinear regime. Numerical solutions to this equation predict a variety of possible scenarios of nonlinear evolution of the instability some of which are in good qualitative agreement with experimental observations.

Stupakov, G.V.; /SLAC; Breizman, B.N.; Pekker, M.S.; /Texas U.

2011-09-09T23:59:59.000Z

414

Nonlinear quantum equations: Classical field theory  

SciTech Connect (OSTI)

An exact classical field theory for nonlinear quantum equations is presented herein. It has been applied recently to a nonlinear Schrödinger equation, and it is shown herein to hold also for a nonlinear generalization of the Klein-Gordon equation. These generalizations were carried by introducing nonlinear terms, characterized by exponents depending on an index q, in such a way that the standard, linear equations, are recovered in the limit q? 1. The main characteristic of this field theory consists on the fact that besides the usual ?(x(vector sign),t), a new field ?(x(vector sign),t) needs to be introduced in the Lagrangian, as well. The field ?(x(vector sign),t), which is defined by means of an additional equation, becomes ?{sup *}(x(vector sign),t) only when q? 1. The solutions for the fields ?(x(vector sign),t) and ?(x(vector sign),t) are found herein, being expressed in terms of a q-plane wave; moreover, both field equations lead to the relation E{sup 2}=p{sup 2}c{sup 2}+m{sup 2}c{sup 4}, for all values of q. The fact that such a classical field theory works well for two very distinct nonlinear quantum equations, namely, the Schrödinger and Klein-Gordon ones, suggests that this procedure should be appropriate for a wider class nonlinear equations. It is shown that the standard global gauge invariance is broken as a consequence of the nonlinearity.

Rego-Monteiro, M. A.; Nobre, F. D. [Centro Brasileiro de Pesquisas Físicas and National Institute of Science and Technology for Complex Systems, Rua Xavier Sigaud 150, 22290-180 Rio de Janeiro - RJ (Brazil)] [Centro Brasileiro de Pesquisas Físicas and National Institute of Science and Technology for Complex Systems, Rua Xavier Sigaud 150, 22290-180 Rio de Janeiro - RJ (Brazil)

2013-10-15T23:59:59.000Z

415

Nonhydrostatic and nonlinear contributions to the energy flux budget in nonlinear internal waves  

E-Print Network [OSTI]

Nonhydrostatic and nonlinear contributions to the energy flux budget in nonlinear internal waves S waves. Our results show that the contributions to the total energy flux from these additional terms as well as non- linearity. The partitioning of the incident internal wave energy over the course

Fringer, Oliver B.

416

Gallium/aluminum nanocomposite material for nonlinear optics and nonlinear plasmonics  

E-Print Network [OSTI]

Gallium/aluminum nanocomposite material for nonlinear optics and nonlinear plasmonics A. V penetration of gallium into an aluminum film. These composite films form mirrorlike interfaces with silica optics and active plasmonics. The material is a polycrystalline aluminum film on a silica sub- strate

Zheludev, Nikolay

417

An nual En ergy Re view 2001  

Gasoline and Diesel Fuel Update (EIA)

An nual En ergy Re view 2001 An nual En ergy Re view 2001 The An nual En ergy Re view (AER) pres ents the En ergy In for ma tion Ad min - is tra tion's his tor i cal en ergy sta tis tics. For many se ries, sta tis tics are given for ev ery year from 1949 through 2001. The sta tis tics, ex pressed in ei ther phys i cal units or Brit ish ther mal units, cover all ma jor en ergy ac tiv i ties, in - clud ing con sump tion, pro duc tion, trade, stocks, and prices, for all ma jor en - ergy com mod i ties, in clud ing fos sil fu els, elec tric ity, and re new able en ergy sources. Pub li ca tion of this re port is re quired un der Pub lic Law 95-91 (De part ment of En ergy Or ga ni za tion Act), Sec tion 205(c), and is in keep ing with re spon - si bil i ties given to the En ergy In for ma tion Ad min is tra tion un der Sec tion

418

Parametric acoustic arrays: A Bergen view.  

Science Journals Connector (OSTI)

At the University of Bergen (UoB) Norway research activity in physical acoustics started in the mid?1960s with investigations on the parametric acoustic array (PAA). The newly appointed professor in applied mathematics Sigve Tjo/tta had some years earlier been at Brown University and was inspired by the concept at a fundamental level but also wanted experimental confirmation. No previous acoustical activity existed at UoB. The PAA project was started as a master project at Department of Physics where the main activity was in nuclear high?energy and ionospheric physics. Bellin and Beyer’s experiment served as a model. The results provided new information on the axial and directional properties of the difference frequency wave field. Inspired by this theoretical modeling continued along with further measurements. Other nonlinear effects like acoustic streaming (boundary layer density gradient) were also investigated. In 1975 a project together with SIMRAD and Norwegian Technical University resulted in a bottom penetrating PAA later commercialized as “TOPAS.” Numerical modeling based on the KZK equation resulted in the “Bergen Code ” still in use for computing nonlinear acoustic propagation problems. In later years activity at UoB has expanded to encompass linear physical acoustics of various sorts occasionally using PAA as a tool.

2009-01-01T23:59:59.000Z

419

Autocatalytic silver-plating of aluminium radio frequency waveguides with autocatalytic nickel as the undercoat for space applications  

Science Journals Connector (OSTI)

Autocatalytic plating, a technique used for evenly coating contoured items with deep cavities, such as microwave components, irrespective of shape and size of the item to be plated, was used in this work to coat a radio frequency waveguide. In this work, a process sequence was developed for autocatalytic silver plating on aluminum base material with autocatalytic nickel as the undercoat. The thickness of the deposited silver depends on variables like temperature, concentration of silver ions in the electrolyte, and the pH of the solution. The influence of these variables was studied under different process conditions. Silver-coated rectangular plates were subjected to various tests, including a bend test, a heat resistance test, a thermal cycling test, a thermo vacuum test, a solderability test, and a humidity resistance test. Autocatalytic silver-coated RF waveguide WR28 was tested for insertion loss and return loss. Autocatalytic silver-plated rectangular plates and waveguides were found to withstand a simulated space environment.

Sharad Shukla; N Gomathi; Rene George

2014-01-01T23:59:59.000Z

420

Evaluation of the TE12 mode in circular waveguide for low-loss, high-power rf transmission  

Science Journals Connector (OSTI)

The use of TE12 in circular waveguide with smooth walls was suggested for low-loss transport of rf signals in multimoded systems [S. G. Tantawi et al., in Advanced Accelerator Concepts: Eighth Workshop, edited by Wes Lawson, AIP Conf. Proc. No. 472 (AIP, New York, 1999), pp. 967–974]. Such systems use the same waveguide to transport different signals over different modes. In this report we detail a series of experiments designed to measure the characteristics of this mode. We also describe the different techniques used to generate it and receive it. The experiments were done at X band around a frequency of 11.424 GHz, the frequency of choice for future linear colliders at X band [The NLC Design Group, Report No. LBNL-PUB-5424, SLAC Report No. 474, Report No. UCRL-ID 124161, 1996; The JLC Design Group, KEK-REPORT-97-1, 1997]. The transportation medium is 55 m of highly overmoded circular waveguide. The design of the joining flanges is also presented.

Sami G. Tantawi, C. D. Nantista, G. B. Bowden, K. S. Fant, N. M. Kroll, A. E. Vlieks, Y.-H. Chin, H. Hayano, V. F. Vogel, and J. Nielson

2000-08-03T23:59:59.000Z

Note: This page contains sample records for the topic "nonlinear waveguides view" 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

Damage detection in initially nonlinear systems  

SciTech Connect (OSTI)

The primary goal of Structural Health Monitoring (SHM) is to detect structural anomalies before they reach a critical level. Because of the potential life-safety and economic benefits, SHM has been widely studied over the past decade. In recent years there has been an effort to provide solid mathematical and physical underpinnings for these methods; however, most focus on systems that behave linearly in their undamaged state - a condition that often does not hold in complex 'real world' systems and systems for which monitoring begins mid-lifecycle. In this work, we highlight the inadequacy of linear-based methodology in handling initially nonlinear systems. We then show how the recently developed autoregressive support vector machine (AR-SVM) approach to time series modeling can be used for detecting damage in a system that exhibits initially nonlinear response. This process is applied to data acquired from a structure with induced nonlinearity tested in a laboratory environment.

Bornn, Luke [Los Alamos National Laboratory; Farrar, Charles [Los Alamos National Laboratory; Park, Gyuhae [Los Alamos National Laboratory

2009-01-01T23:59:59.000Z

422

Arbitrary manipulation of nonlinear optical processes  

E-Print Network [OSTI]

Nonlinear optical processes are governed by the relative-phase relationships among the relevant electromagnetic fields in these processes. In this Letter, we describe the physics of arbitrary manipulation of nonlinear optical processes (AMNOP) by artificial control of relative phases. As a typical example, we show freely designable optical-frequency conversions to extreme spectral regions, mid-infrared and vacuum-ultraviolet, with near-unity quantum efficiencies. Furthermore, we show that such optical-frequency conversions can be realized by using a surprisingly simple technology where transparent plates are placed in a nonlinear optical medium and their positions and thicknesses are adjusted precisely. In a numerical experiment assuming practically applicable parameters in detail, we demonstrate a single-frequency tunable laser that covers the whole vacuum-ultraviolet spectral range of 120 to 200 nm.

Jian Zheng; Masayuki Katsuragawa

2014-06-16T23:59:59.000Z

423

Nonlinear extraordinary wave in dense plasma  

SciTech Connect (OSTI)

Conditions for the propagation of a slow extraordinary wave in dense magnetized plasma are found. A solution to the set of relativistic hydrodynamic equations and Maxwell’s equations under the plasma resonance conditions, when the phase velocity of the nonlinear wave is equal to the speed of light, is obtained. The deviation of the wave frequency from the resonance frequency is accompanied by nonlinear longitudinal-transverse oscillations. It is shown that, in this case, the solution to the set of self-consistent equations obtained by averaging the initial equations over the period of high-frequency oscillations has the form of an envelope soliton. The possibility of excitation of a nonlinear wave in plasma by an external electromagnetic pulse is confirmed by numerical simulations.

Krasovitskiy, V. B., E-mail: krasovit@mail.ru [Russian Academy of Sciences, Keldysh Institute of Applied Mathematics (Russian Federation); Turikov, V. A. [Russian University of Peoples’ Friendship (Russian Federation)] [Russian University of Peoples’ Friendship (Russian Federation)

2013-10-15T23:59:59.000Z

424

Fabrication and characterization of As[subscript 2]S[subscript 3]/Y[subscript 3]Fe[subscript 5]O[subscript 12] and Y[subscript 3]Fe[subscript 5]O[subscript 12]/SOI strip-loaded waveguides for integrated optical isolator applications  

E-Print Network [OSTI]

We report two novel strategies to integrate magneto-optical oxides on oxidized silicon and SOI platforms based on strip-loaded waveguide structures. By using conventional waveguide fabrication and thin film deposition ...

Ross, Caroline A.

425

Solar Viewed as Triple Boon for Bishop Paiute Tribe | Department...  

Broader source: Energy.gov (indexed) [DOE]

Solar Viewed as Triple Boon for Bishop Paiute Tribe Solar Viewed as Triple Boon for Bishop Paiute Tribe July 1, 2014 - 8:00am Addthis What does this project do? Tribal participants...

426

Cellulosic Biofuels: Expert Views on Prospects for Advancement: Supplementary Material  

E-Print Network [OSTI]

Cellulosic Biofuels: Expert Views on Prospects for Advancement: Supplementary Material Erin Baker Keywords: Biofuels; Technology R&D; Uncertainty; Environmental policy 2 #12;1 Introduction This paper contains supplementary material for "Cellulosic Biofuels: Expert Views on Prospects for Advancement

Massachusetts at Amherst, University of

427

Enabling View-Dependent Stereoscopic Projection in Real Environments  

Science Journals Connector (OSTI)

We show how view-dependent image-based and geometric warping, radiometric compensation, and multi-focal projection enable a view-dependent stereoscopic visualization on ordinary (geometrically complex, colored and textured) surfaces within everyday environments. ...

Oliver Bimber; Gordon Wetzstein; Andreas Emmerling; Christian Nitschke

2005-10-01T23:59:59.000Z

428

Better Buildings Network View | July-August 2014 | Department...  

Broader source: Energy.gov (indexed) [DOE]

July-August 2014 Better Buildings Network View | July-August 2014 The Better Buildings Network View monthly newsletter from the U.S. Department of Energy's Better Buildings...

429

Kicked nonlinear quantum scissors and entanglement generation  

E-Print Network [OSTI]

We consider a nonlinear coupler with two Kerr-like oscillators mutually coupled by continuous linear interaction and excited by a series of ultra-short external pulses. We show that the system behaves as nonlinear quantum scissors. It evolves such a way that it can be treated as qubit-qubit system. We derive analytic formulas for the probabilities of the states involved in the system's evolution and show that they differ from those already discussed in the literature and corresponding to the continuously excited models. Moreover, for model discussed here, maximally entangled Bell states can be generated with high efficiency.

A. Kowalewska-Kud?aszyk; W. Leo?ski; T. Dung Nguyen; V. Cao Long

2014-04-07T23:59:59.000Z

430

Derivation of an Applied Nonlinear Schroedinger Equation.  

SciTech Connect (OSTI)

We derive from first principles a mathematical physics model useful for understanding nonlinear optical propagation (including filamentation). All assumptions necessary for the development are clearly explained. We include the Kerr effect, Raman scattering, and ionization (as well as linear and nonlinear shock, diffraction and dispersion). We explain the phenomenological sub-models and each assumption required to arrive at a complete and consistent theoretical description. The development includes the relationship between shock and ionization and demonstrates why inclusion of Drude model impedance effects alters the nature of the shock operator. Unclassified Unlimited Release

Pitts, Todd Alan; Laine, Mark Richard; Schwarz, Jens; Rambo, Patrick K.; Karelitz, David B.

2015-01-01T23:59:59.000Z

431

Nonlinear mode coupling analysis in the Tevatron  

SciTech Connect (OSTI)

Increased demand for higher luminosities from Fermilab proton-antiproton collider requires higher intensities and increased number of bunches. The performance of existing 6 x 6 and the proposed 36 x 36 collider is often limited by the non-linear effects arising from beam-beam interactions, in particular for high intensity beams. The tune shifts and spread from increased long range interactions combined with higher order multipoles complicates the frequency spectrum of the particle motions. TEAPOT simulation program is used to generate turn by turn data that could be used in the nonlinear mode spectrums analysis. Bispectral mode analysis is discussed.

Assadi, S.; Mishra, C.S.

1995-08-01T23:59:59.000Z

432

Nonlinear nanomechanical oscillators for ultrasensitive inertial detection  

DOE Patents [OSTI]

A system for ultrasensitive mass and/or force detection of this invention includes a mechanical oscillator driven to oscillate in a nonlinear regime. The mechanical oscillator includes a piezoelectric base with at least one cantilever resonator etched into the piezoelectric base. The cantilever resonator is preferably a nonlinear resonator which is driven to oscillate with a frequency and an amplitude. The system of this invention detects an amplitude collapse of the cantilever resonator at a bifurcation frequency as the cantilever resonator stimulated over a frequency range. As mass and/or force is introduced to the cantilever resonator, the bifurcation frequency shifts along a frequency axis in proportion to the added mass.

Datskos, Panagiotis George; Lavrik, Nickolay V

2013-08-13T23:59:59.000Z

433

Nonlinear optical analogies in quantum electrodynamics  

E-Print Network [OSTI]

Some of the basic notions of nonlinear optics are summarized and then applied to the case of the Dirac vacuum, as described by the Heisenberg-Euler effective one-loop Lagrangian. The theoretical and experimental basis for the appearance of nonlinear optical phenomena, such as the Kerr effect, Cotton-Mouton effect, and four-wave mixing are discussed. Further effects due to more exotic assumptions on the structure of spacetime, such as gravitational curvature and the topology of the Casimir vacuum are also presented.

D. H. Delphenich

2006-10-08T23:59:59.000Z

434

Nonlinear plasma wave in magnetized plasmas  

SciTech Connect (OSTI)

Nonlinear axisymmetric cylindrical plasma oscillations in magnetized collisionless plasmas are a model for the electron fluid collapse on the axis behind an ultrashort relativisically intense laser pulse exciting a plasma wake wave. We present an analytical description of the strongly nonlinear oscillations showing that the magnetic field prevents closing of the cavity formed behind the laser pulse. This effect is demonstrated with 3D PIC simulations of the laser-plasma interaction. An analysis of the betatron oscillations of fast electrons in the presence of the magnetic field reveals a characteristic “Four-Ray Star” pattern.

Bulanov, Sergei V. [Kansai Photon Science Institute, JAEA, Kizugawa, Kyoto 619-0215 (Japan) [Kansai Photon Science Institute, JAEA, Kizugawa, Kyoto 619-0215 (Japan); Prokhorov Institute of General Physics, Russian Academy of Sciences, Moscow 119991 (Russian Federation); Moscow Institute of Physics and Technology, Dolgoprudny, Moscow region 141700 (Russian Federation); Esirkepov, Timur Zh.; Kando, Masaki; Koga, James K. [Kansai Photon Science Institute, JAEA, Kizugawa, Kyoto 619-0215 (Japan)] [Kansai Photon Science Institute, JAEA, Kizugawa, Kyoto 619-0215 (Japan); Hosokai, Tomonao; Zhidkov, Alexei G. [Photon Pioneers Center, Osaka University, 2-8 Yamadaoka, Suita, Osaka 565-0871 (Japan) [Photon Pioneers Center, Osaka University, 2-8 Yamadaoka, Suita, Osaka 565-0871 (Japan); Japan Science and Technology Agency, CREST, 2-1, Yamadaoka, Suita, Osaka 565-0871 (Japan); Kodama, Ryosuke [Photon Pioneers Center, Osaka University, 2-8 Yamadaoka, Suita, Osaka 565-0871 (Japan) [Photon Pioneers Center, Osaka University, 2-8 Yamadaoka, Suita, Osaka 565-0871 (Japan); Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871 (Japan)

2013-08-15T23:59:59.000Z

435

news & views nature genetics volume 29 october 2001 105  

E-Print Network [OSTI]

news & views nature genetics · volume 29 · october 2001 105 Since the sequence of the yeast genome

Church, George M.

436

Better Buildings Network View | July-August 2014  

Broader source: Energy.gov [DOE]

The Better Buildings Network View monthly newsletter from the U.S. Department of Energy's Better Buildings Residential Network.

437

Energy Efficiency in Buildings- the Utilities View  

E-Print Network [OSTI]

PAGE 1 Energy Efficiency in Buildings - the Utilities View U. K?nig RWE Energy AG The energy to lead ESL-IC-08-10-27 Proceedings of the Eighth International Conference for Enhanced Building Operations, Berlin, Germany, October 20-22, 2008 RWE... International Conference for Enhanced Building Operations, Berlin, Germany, October 20-22, 2008 RWE Energy / Energieeffizienz bei Immobilien / U. K?nig / ICEBO '08 SEITE 3 RWE ? One of the five leading Energy Companies in Europe > Nr 1 producer of electricity...

Konig, U.

438

A New View of the Cosmic Landscape  

E-Print Network [OSTI]

In this scenario, a generic meta-stable deSitter vacuum site in the cosmic landscape in string theory has a very short lifetime. Typically, the smaller is the vacuum energy of a meta-stable site, the longer is its lifetime. This view of the landscape can provide a qualitative dynamical explanation why the dark energy of our universe is so small. The argument for this scenario is based on resonance tunneling, a well-known quantum mechanical phenomenon, the topography of the landscape, and the vastness of the cosmic landscape. Mapping the topography of the landscape, even if only in a small region, will test the validity of this scenario.

S. -H. Henry Tye

2007-04-16T23:59:59.000Z

439

UWB radar technique for arc detection in coaxial cables and waveguides  

SciTech Connect (OSTI)

As spread spectrum technology has revolutionized the communications industry, Ultra Wide Band (UWB) technology is dramatically improving radar performances. These advanced signal processing techniques have been adapted to coaxial cables and waveguides to provide new features and enhanced performance on arc detection. UWB signals constituted by a sequence of chips (properly chosen to reduce side lobes and to improve detection accuracy) are transmitted along the transmission lines at a specified Pulse Repetition Frequency (PRF) and their echoes are received by means of directional couplers. The core of the receiver is an ultra high-speed correlator implemented in a Digital Signal Processor (DSP). When a target (arc) is detected, its position and its 'radar cross section' are calculated to be able to provide the arc position along the transmission line and to be able to classify the type of detected arc. The 'background scattering' is routinely extracted from the received signal at any pulse. This permits to be resilient to the background structure of transmission lines (bends, junctions, windows, etc.). Thanks to the localization feature, segmentation is also possible for creating sensed and non-sensed zones (for example, to be insensitive to antenna load variations)

Maggiora, R.; Salvador, S. [Politecnico di Torino, Department of Electronics, Torino (Italy)

2009-11-26T23:59:59.000Z

440

Waveguide-integrated black phosphorus photodetector with high responsivity and low dark current  

E-Print Network [OSTI]

Layered two-dimensional materials have shown novel optoelectronic properties and are well suited to be integrated in planar photonic circuits. For example, graphene has been utilized as a wideband photodetector. However, because it lacks a band gap, graphene photodetectors suffer from extremely high dark current8. In contrast, few-layer black phosphorous, the latest addition to the family of 2D materials, is well-suited for photodetector applications due to its narrow but finite energy gap. Here, we demonstrate a gated multilayer black phosphorus photodetector integrated in a silicon photonic waveguide operating in the near-infrared telecom band. In a significant advantage over graphene devices, black phosphorus photodetectors can operate under a bias with very low dark current and attain intrinsic responsivity up to 125 mA/W and 657 mA/W in 11.5nm and 100 nm thick devices, respectively. The photocurrent is dominated by the photovoltaic effect with a high response bandwidth exceeding 3 GHz.

Youngblood, Nathan; Koester, Steven J; Li, Mo

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "nonlinear waveguides view" 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

Nonlinear springs with applications to flow regulation valves and mechanisms  

E-Print Network [OSTI]

This thesis focuses on the application of nonlinear springs for fluid flow control valves where geometric constraints, or fabrication technologies, limit the use of available solutions. Types of existing nonlinear springs ...

Freeman, David Calvin

2008-01-01T23:59:59.000Z

442

EXISTENCE OF SOLUTIONS TO A NONLINEAR PROBLEM INVOLVING ISOTROPIC DEFORMATIONS  

E-Print Network [OSTI]

EXISTENCE OF SOLUTIONS TO A NONLINEAR PROBLEM INVOLVING ISOTROPIC DEFORMATIONS ANA CRISTINA BARROSO manuscript, published in "Journal of Nonlinear Systems and Applications (2010) ?" #12;2 ANA CRISTINA BARROSO

Paris-Sud XI, Université de

443

Nonlinear Analysis and Dynamic Structure in the Energy Market  

E-Print Network [OSTI]

This research assesses the dynamic structure of the energy sector of the aggregate economy in the context of nonlinear mechanisms. Earlier studies have focused mainly on the price of the energy products when detecting nonlinearities in time series...

Aghababa, Hajar

2012-08-31T23:59:59.000Z

444

Linear theory for filtering nonlinear multiscale systems with model error  

Science Journals Connector (OSTI)

...AJ , and J Harlim. 2013 Physics constrained nonlinear regression...for statistical estimation of physics constrained nonlinear regression...Warwick. 42 Gardiner, CW . 1997 Handbook of stochastic methods for physics, chemistry, and the natural...

2014-01-01T23:59:59.000Z

445

Thermal unfolding dynamics of proteins probed by nonlinear infrared spectroscopy  

E-Print Network [OSTI]

This thesis presents spectroscopic approaches to study the thermal unfolding dynamics of proteins. The spectroscopic tool is nonlinear infrared (IR) spectroscopy of the protein amide I band. Among various nonlinear IR ...

Chung, Hoi Sung

2007-01-01T23:59:59.000Z

446

Refinery Production Planning: Multiperiod MINLP with Nonlinear CDU  

E-Print Network [OSTI]

as integrated planning and scheduling refinery operation models are recognized as key 1 Refinery Production Planning: Multiperiod MINLP with Nonlinear CDU Model-Rivera (2011) developed a single-period, nonlinear programing refinery planning model

Grossmann, Ignacio E.

447

Nonlinear excitations in Debye bi-crystals  

SciTech Connect (OSTI)

The nonlinear dynamics of longitudinal dust lattice waves propagating in a dusty plasma bi-crystal is investigated. A ''diatomic''-like one-dimensional dust lattice configuration is considered, consisting of two distinct dust grain species with different charges and masses. Two different frequency dispersion modes are obtained in the linear limit, namely, an optical and an acoustic wave dispersion branch. Nonlinear solitary wave solutions are shown to exist in both branches, by considering the continuum limit for lattice excitations in different nonlinear potential regimes. For this purpose, a generalized Boussinesq and an extended Korteweg de Vries equation is derived, for the acoustic mode excitations, and their exact soliton solutions are provided and compared. For the optic mode, a nonlinear Schroedinger-type equation is obtained, which is shown to possess bright- (dark-) type envelope soliton solutions in the long (short, respectively) wavelength range. Optic-type longitudinal wavepackets are shown to be generally unstable in the continuum limit, though this is shown not to be the rule in the general (discrete) case.

Farokhi, B.; Kourakis, I.; Shukla, P. K. [Department of Physics, University of Arak, Arak (Iran, Islamic Republic of); Centre for Plasma Physics (CPP), Department of Physics and Astronomy, Queen's University Belfast, BT7 1 NN Northern Ireland (United Kingdom); Ruhr-Universitaet Bochum, Theoretische Physik IV, Fakultaet fuer Physik und Astronomie, D-44780 Bochum (Germany)

2007-10-15T23:59:59.000Z

448

Survey Constructive nonlinear control: a historical perspective  

Science Journals Connector (OSTI)

In the early days of nonlinear control theory most of the stability, optimality and uncertainty concepts were descriptive rather than constructive. This survey describes their 'activation' into design tools and constructive procedures. Structural properties ... Keywords: Applications, Design tools, Feedback passivation, Inverse optimality, Recursive procedures, Robust stabilization

Petar Kokotovi?; Murat Arcak

2001-05-01T23:59:59.000Z

449

Pitch Perception of Complex Sounds: Nonlinearity Revisited  

E-Print Network [OSTI]

The ability of the auditory system to perceive the fundamental frequency of a sound even when this frequency is removed from the stimulus is an interesting phenomenon related to the pitch of complex sounds. This capability is known as ``residue'' or ``virtual pitch'' perception and was first reported last century in the pioneering work of Seebeck. It is residue perception that allows one to listen to music with small transistor radios, which in general have a very poor and sometimes negligible response to low frequencies. The first attempt, due to Helmholtz, to explain the residue as a nonlinear effect in the ear considered it to originate from difference combination tones. However, later experiments have shown that the residue does not coincide with a difference combination tone. These results and the fact that dichotically presented signals also elicit residue perception have led to nonlinear theories being gradually abandoned in favour of central processor models. In this paper we use recent results from the theory of nonlinear dynamical systems to show that physical frequencies produced by generic nonlinear oscillators acted upon by two independent periodic excitations can reproduce with great precision most of the experimental data about the residue without resorting to any kind of central processing mechanism.

D. L. Gonzalez; L. Morettini; F. Sportolari; O. Rosso; J. H. E. Cartwright; O. Piro

1995-05-05T23:59:59.000Z

450

Minimizing control variation in nonlinear optimal control  

Science Journals Connector (OSTI)

In any real system, changing the control signal from one value to another will usually cause wear and tear on the system's actuators. Thus, when designing a control law, it is important to consider not just predicted system performance, but also the ... Keywords: Constrained optimal control, Nonlinear optimization, Optimal control computation, Total variation

Ryan Loxton; Qun Lin; Kok Lay Teo

2013-09-01T23:59:59.000Z

451

Nonlinear Conic Optimization --why and how--  

E-Print Network [OSTI]

Nonlinear Conic Optimization --why and how-- Michal Kocvara School of Mathematics, The University Optimization 1 / 38 #12;Conic optimization "generalized" mathematical optimization problem min f(x) subject optimization, LCO convex convex conic optimization, CCO non-convex non-convex conic optimization, NCO Michal

Sidorov, Nikita

452

Nonlinear Contraction Tools for Constrained Optimization  

E-Print Network [OSTI]

This paper describes new results linking constrained optimization theory and nonlinear contraction analysis. Generalizations of Lagrange parameters are derived based on projecting system dynamics on the tangent space of possibly time-varying constraints. The paper formalizes the intuition that, just as convexity rather than linearity is the key property in optimization, contraction rather than linearity is the key dynamical property in this context.

Jonathan Soto; Jean-Jacques E. Slotine

2012-06-07T23:59:59.000Z

453

Optimization and Nonlinear Equations Gordon K. Smyth  

E-Print Network [OSTI]

Optimization and Nonlinear Equations Gordon K. Smyth May 1997 Optimization means to find that value of x which max­ imizes or minimizes a given function f(x). The idea of optimization goes to the heart with respect to the components of x. Except in linear cases, optimization and equation solving invariably

Smyth, Gordon K.

454

From nonlinear PDEs to singular ODEs  

Science Journals Connector (OSTI)

We discuss a new approach for the numerical computation of self-similar blow-up solutions of certain nonlinear partial differential equations. These solutions become unbounded in finite time at a single point at which there is a growing and increasingly ... Keywords: Blow-up solutions, Collocation methods, Quasilinear partial differential equations, Self-similarity, Singular ordinary differential equations

Chris Budd; Othmar Koch; Ewa Weinmüller

2006-03-01T23:59:59.000Z

455

Non-linear wave equations Hans Ringstrom  

E-Print Network [OSTI]

105 3. Power type non-linearities 108 4. Global existence for small data 109 5. Observations the Maxwell vacuum equations for an electric and magnetic potential also yields wave equations. In order differential equations (PDE:s) is quite big. The linear theory is based on the fact that by adding two

Ringström, Hans

456

Non-linear wave equations Hans Ringstrom  

E-Print Network [OSTI]

105 3. Power type non-linearities 108 4. Global existence for small data 109 5. Observations boundary conditions. Formulating the Maxwell vacuum equations for an electric and magnetic potential also di#11;erential equations (PDE:s) is quite big. The linear theory is based on the fact that by adding

Ringström, Hans

457

Observers for systems with nonlinearities satisfying incremental quadratic constraints  

Science Journals Connector (OSTI)

We consider the problem of designing observers to asymptotically estimate the state of a system whose nonlinear time-varying terms satisfy an incremental quadratic inequality that is parameterized by a set of multiplier matrices. Observer design is reduced ... Keywords: Application of nonlinear analysis and design, Linear matrix inequalities, Nonlinear observer and filter design, Optimization-based controller synthesis

Behçet Aç?kme?e; Martin Corless

2011-07-01T23:59:59.000Z

458

Aeroelastic Analysis of Bridges: Effects of Turbulence and Aerodynamic Nonlinearities  

E-Print Network [OSTI]

Aeroelastic Analysis of Bridges: Effects of Turbulence and Aerodynamic Nonlinearities Xinzhong Chen for capturing the emerging concerns in bridge aerodynamics introduced by aerodynamic nonlinearities/or with aerodynamic characteristics sensitive to the effective angle of incidence. This paper presents a nonlinear

Kareem, Ahsan

459

NONLINEAR MODEL IDENTIFICATION OF A MARINE PROPELLER OVER  

E-Print Network [OSTI]

...cation, marine, modeling, nonlinear, propulsion 1. INTRODUCTION Maneuvering and dynamic positioning controlNONLINEAR MODEL IDENTIFICATION OF A MARINE PROPELLER OVER FOUR-QUADRANT OPERATIONS Luca Pivano Thor and Technology, N-7491 Norway Abstract: This paper proposes a nonlinear dynamics model for a marine propeller

Johansen, Tor Arne

460

Nonlinear optics: The next decade Yuri S. Kivshar  

E-Print Network [OSTI]

Nonlinear optics: The next decade Yuri S. Kivshar Center for Ultra-high bandwidth Devices for Optical Systems (CUDOS), Nonlinear Physics Center, Research School of Physical Sciences and Engineering assembled of invited papers in key areas of nonlinear optics (Editors: J.M. Dudley and R.W. Boyd

Note: This page contains sample records for the topic "nonlinear waveguides view" 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

The nonlinear dynamics of the Oklo natural reactor  

SciTech Connect (OSTI)

An analysis of the Oklo natural reactor, a self-sustaining and self-regulating critical assembly that existed some 2 billion years ago in Gabon, Africa, is presented. Nonlinear continuous dif ferential and nonlinear discrete iterative formulations are established and selected parameter characterizations identified. Conceivable power oscillations are calculated and discussed. Some implications of nonlinear mappings for nuclear simulation are suggested.

Bilanovic, Z.; Harms, A.A.

1985-11-01T23:59:59.000Z

462

Asymmetric parametric amplification in nonlinear left-handed transmission lines  

E-Print Network [OSTI]

Asymmetric parametric amplification in nonlinear left-handed transmission lines David A. Powell amplification in nonlinear left-handed transmission lines, which serve as model systems for nonlinear negative-handed regime. © 2009 American Institute of Physics. DOI: 10.1063/1.3089842 Left-handed transmission lines

463

A New Method for Detecting the Time-Varying Nonlinear Damping in Nonlinear Oscillation Systems: Nonparametric Identification  

E-Print Network [OSTI]

This paper presents an original method that can be used for identifying time-varying nonlinear damping characteristics of a nonlinear oscillation system. The method developed involves the nonparametric identification, in ...

Jang, T. S.

464

Electron scattering and nonlinear trapping by oblique whistler waves: The critical wave intensity for nonlinear effects  

SciTech Connect (OSTI)

In this paper, we consider high-energy electron scattering and nonlinear trapping by oblique whistler waves via the Landau resonance. We use recent spacecraft observations in the radiation belts to construct the whistler wave model. The main purpose of the paper is to provide an estimate of the critical wave amplitude for which the nonlinear wave-particle resonant interaction becomes more important than particle scattering. To this aim, we derive an analytical expression describing the particle scattering by large amplitude whistler waves and compare the corresponding effect with the nonlinear particle acceleration due to trapping. The latter is much more rare but the corresponding change of energy is substantially larger than energy jumps due to scattering. We show that for reasonable wave amplitudes ?10–100?mV/m of strong whistlers, the nonlinear effects are more important than the linear and nonlinear scattering for electrons with energies ?10–50?keV. We test the dependencies of the critical wave amplitude on system parameters (background plasma density, wave frequency, etc.). We discuss the role of obtained results for the theoretical description of the nonlinear wave amplification in radiation belts.

Artemyev, A. V., E-mail: ante0226@gmail.com; Vasiliev, A. A. [Space Research Institute, RAS, Moscow (Russian Federation); Mourenas, D.; Krasnoselskikh, V. V. [LPC2E/CNRS—University of Orleans, Orleans (France); Agapitov, O. V. [Space Sciences Laboratory, University of California, Berkeley, California 94720 (United States)

2014-10-15T23:59:59.000Z

465

Localized parallel parametric generation of spin waves in a Ni{sub 81}Fe{sub 19} waveguide by spatial variation of the pumping field  

SciTech Connect (OSTI)

We present the experimental observation of localized parallel parametric generation of spin waves in a transversally in-plane magnetized Ni{sub 81}Fe{sub 19} magnonic waveguide. The localization is realized by combining the threshold character of parametric generation with a spatially confined enhancement of the amplifying microwave field. The latter is achieved by modulating the width of the microstrip transmission line which is used to provide the pumping field. By employing microfocussed Brillouin light scattering spectroscopy, we analyze the spatial distribution of the generated spin waves and compare it with numerical calculations of the field distribution along the Ni{sub 81}Fe{sub 19} waveguide. This provides a local spin-wave excitation in transversally in-plane magnetized waveguides for a wide wave-vector range which is not restricted by the size of the generation area.

Brächer, T. [Fachbereich Physik and Landesforschungszentrum OPTIMAS, Technische Universität Kaiserslautern, D-67663 Kaiserslautern (Germany); Graduate School Materials Science in Mainz, Gottlieb-Daimler-Strasse 47, D-67663 Kaiserslautern (Germany); Pirro, P.; Heussner, F.; Serga, A. A.; Hillebrands, B. [Fachbereich Physik and Landesforschungszentrum OPTIMAS, Technische Universität Kaiserslautern, D-67663 Kaiserslautern (Germany)

2014-03-03T23:59:59.000Z

466

Mountain View IV | Open Energy Information  

Open Energy Info (EERE)

IV IV Facility Mountain View IV Sector Wind energy Facility Type Commercial Scale Wind Facility Status In Service Owner AES Wind Generation Developer AES Wind Generation Energy Purchaser Southern California Edison Co Location White Water CA Coordinates 33.95475187°, -116.7015839° 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":33.95475187,"lon":-116.7015839,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

467

Study advances view of geopressure seals  

SciTech Connect (OSTI)

The last decade has seen a growing interest in the subject of fluid pressure seals and fluid flow in hydrocarbon-bearing basins. As explorationists begin to view basins in terms of coupled, dynamic, chemical, and physical processes, seemingly unrelated observations become interrelated. It is precisely the integration of geological, geochemical, and geophysical observations that opens the door for new exploration opportunities. This article lays a conceptual foundation in the area of geopressure seals and on the role of geopressure in hydrocarbon migration and accumulation in young, clastic basins. The exploration significance of geopressure can be appreciated when one considers that within the gulf Coast basin, geopressured fields, which represent only 10% of the total number of fields, account for approximately 50% of the cumulative production.

Benzing, W.M.; Shook, G.M. [Idaho National Engineering Lab., Idaho Falls, ID (United States)

1996-05-20T23:59:59.000Z

468

Wave propagation in photonic crystals and metamaterials: Surface waves, nonlinearity and chirality  

SciTech Connect (OSTI)

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

469

Training and Research Experiences in Nonlinear DynamicsTraining and Research Experiences in Nonlinear Dynamics TREND 2004TREND 2004  

E-Print Network [OSTI]

Training and Research Experiences in Nonlinear DynamicsTraining and Research Experiences Shew, Santiago Triana, Daniel Zimmerman, and John Rodgers #12;Training and Research Experiences in Nonlinear DynamicsTraining and Research Experiences in Nonlinear Dynamics TREND 2004TREND 2004 Our Goals: u

Anlage, Steven

470

Training and Research Experiences in Nonlinear DynamicsTraining and Research Experiences in Nonlinear Dynamics TREND 2003TREND 2003  

E-Print Network [OSTI]

Training and Research Experiences in Nonlinear DynamicsTraining and Research Experiences, Woodrow Shew, Daniel Sisan, Santiago Triana, Daniel Zimmerman #12;Training and Research Experiences in Nonlinear DynamicsTraining and Research Experiences in Nonlinear Dynamics TREND 2003TREND 2003 Our Goal: u

Anlage, Steven

471

Non-linear evolution of the cosmic neutrino background  

SciTech Connect (OSTI)

We investigate the non-linear evolution of the relic cosmic neutrino background by running large box-size, high resolution N-body simulations which incorporate cold dark matter (CDM) and neutrinos as independent particle species. Our set of simulations explore the properties of neutrinos in a reference ?CDM model with total neutrino masses between 0.05-0.60 eV in cold dark matter haloes of mass 10{sup 11}?10{sup 15} h{sup ?1}M{sub s}un, over a redshift range z = 0?2. We compute the halo mass function and show that it is reasonably well fitted by the Sheth-Tormen formula, once the neutrino contribution to the total matter is removed. More importantly, we focus on the CDM and neutrino properties of the density and peculiar velocity fields in the cosmological volume, inside and in the outskirts of virialized haloes. The dynamical state of the neutrino particles depends strongly on their momentum: whereas neutrinos in the low velocity tail behave similarly to CDM particles, neutrinos in the high velocity tail are not affected by the clustering of the underlying CDM component. We find that the neutrino (linear) unperturbed momentum distribution is modified and mass and redshift dependent deviations from the expected Fermi-Dirac distribution are in place both in the cosmological volume and inside haloes. The neutrino density profiles around virialized haloes have been carefully investigated and a simple fitting formula is provided. The neutrino profile, unlike the cold dark matter one, is found to be cored with core size and central density that depend on the neutrino mass, redshift and mass of the halo, for halos of masses larger than ? 10{sup 13.5}h{sup ?1}M{sub s}un. For lower masses the neutrino profile is best fitted by a simple power-law relation in the range probed by the simulations. The results we obtain are numerically converged in terms of neutrino profiles at the 10% level for scales above ? 200 h{sup ?1}kpc at z = 0, and are stable with respect to box-size and starting redshift of the simulation. Our findings are particularly important in view of upcoming large-scale structure surveys, like Euclid, that are expected to probe the non-linear regime at the percent level with lensing and clustering observations.

Villaescusa-Navarro, Francisco; Viel, Matteo [INAF/Osservatorio Astronomico di Trieste, Via Tiepolo 11, 34143, Trieste (Italy); Bird, Simeon [Institute for Advanced Study, 1 Einstein Drive, Princeton, NJ, 08540 (United States); Peña-Garay, Carlos, E-mail: villaescusa@oats.inaf.it, E-mail: spb@ias.edu, E-mail: penya@ific.uv.es, E-mail: viel@oats.inaf.it [Instituto de Física Corpuscular, CSIC-UVEG, E-46071, Paterna, Valencia (Spain)

2013-03-01T23:59:59.000Z

472

Advanced (AI-Based) Nonlinear Controllers for Industrial Processes -  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Advanced (AI-Based) Nonlinear Controllers for Industrial Processes Advanced (AI-Based) Nonlinear Controllers for Industrial Processes Capabilities Nuclear Systems Technologies Nuclear Criticality Safety Research Reactor Analysis Decontamination and Decommissioning Systems/Process Monitoring, Diagnostics and Control Overview Process Monitoring & Signal Validation Diagnostic & Advisory Systems Advanced (AI-based) Nonlinear Controllers for Industrial Processes Artificial intelligence Other Capabilities Work with Argonne Contact us For Employees Site Map Help Systems/Process Monitoring, Diagnostics and Control Advanced (AI-Based) Nonlinear Controllers for Industrial Processes Bookmark and Share Advanced (AI-Based) Nonlinear Controllers for Industrial Processes The overall objective of this research is to explore and demonstrate the

473

Terahertz electromagnetic wave generation and amplification by an electron beam in the elliptical plasma waveguides with dielectric rod  

SciTech Connect (OSTI)

The propagation of electromagnetic waves in an elliptical plasma waveguide including strongly magnetized plasma column and a dielectric rod is investigated. The dispersion relation of guided hybrid electromagnetic waves is obtained. Excitation of the waves by a thin annular relativistic elliptical electron beam will be studied. The time growth rate of electromagnetic waves is obtained. The effects of relative permittivity constant of dielectric rod, radius of dielectric rod, accelerating voltage, and current density of the annular elliptical beam on the growth rate and the frequency spectra are numerically presented.

Rahmani, Z., E-mail: z.rahmani@kashanu.ac.ir; Jazi, B. [Department of Laser and Photonics, Faculty of Physics, University of Kashan, Kashan (Iran, Islamic Republic of); Heidari-Semiromi, E. [Department of Condense Matter, Faculty of Physics, University of Kashan, Kashan (Iran, Islamic Republic of)

2014-09-15T23:59:59.000Z

474

Note: Characterization of the plasma parameters of a capillary discharge-produced plasma channel waveguide to guide an intense laser pulse  

SciTech Connect (OSTI)

We demonstrated the production of an optical waveguide in a capillary discharge-produced plasma using a cylindrical capillary. Plasma parameters of its waveguide were characterized by use of both a Nomarski laser interferometer and a hydrogen plasma line spectrum. A space-averaged maximum temperature of 3.3 eV with electron densities of the order of 10{sup 17} cm{sup -3} was observed at a discharge time of 150 ns and a maximum discharge current of 400 A. An ultrashort, intense laser pulse was guided by use of this plasma channel.

Higashiguchi, Takeshi; Yugami, Noboru [Department of Advanced Interdisciplinary Sciences and Center for Optical Research and Education (CORE), Utsunomiya University, Yoto 7-1-2, Utsunomiya, Tochigi 321-8585 (Japan); CREST, Japan Science and Technology Agency, 4-1-8 Honcho, Kanagawa, Saitama 332-0012 (Japan); Hikida, Masafumi; Terauchi, Hiromitsu; Bai Jinxiang [Department of Advanced Interdisciplinary Sciences and Center for Optical Research and Education (CORE), Utsunomiya University, Yoto 7-1-2, Utsunomiya, Tochigi 321-8585 (Japan); Kikuchi, Takashi [Department of Electrical Engineering, Nagaoka University of Technology, Kami-tomiokamachi 1603-1, Nagaoka, Niigata 940-2188 (Japan); Tao Yezheng [Center for Energy Research, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0438 (United States)

2010-04-15T23:59:59.000Z

475

Enhanced Kerr electro-optic nonlinearity through cascaded Pockels effects  

E-Print Network [OSTI]

We demonstrated a large enhancement of Kerr electro-optic nonlinearity through cascaded Pockels effects in a domain inversion ferroelectric crystal. We designed a structure that can implement the cascaded Pockels effects and second-harmonic generation simultaneously. The energy coupling between the fundamental lights of different polarizations led to a large nonlinear phase shift, and thus an effective electro-optic nonlinear refractive index. The effective nonlinearity can be either positive or negative, causing the second-harmonic spectra to move towards the coupling center, which in turn, offered us a way to measure the effective electro-optic nonlinear refractive index. The corresponding enhanced Kerr electro-optic nonlinearity is more than three orders of magnitude higher than the intrinsic value. These results open a door to manipulate the nonlinear phase by applying external electric field instead of light intensity in noncentrosymmetric crystals.

Li, Guang-Zhen; Jiang, Hao-Wei; Chen, Xian-Feng

2015-01-01T23:59:59.000Z

476

Differential rotation of nonlinear r-modes  

Science Journals Connector (OSTI)

The differential rotation of r-modes is investigated within the nonlinear theory up to second order in the mode amplitude in the case of a slowly rotating, Newtonian, barotropic, perfect-fluid star. We find a nonlinear extension of the linear r-mode, which represents differential rotation that produces large scale drifts of fluid elements along stellar latitudes. This solution includes a piece induced by first-order quantities and another one that is a pure second-order effect. Since the latter is stratified on cylinders, it cannot cancel differential rotation induced by first-order quantities, which is not stratified on cylinders. It is shown that, unlike the situation in the linearized theory, r-modes do not preserve the vorticity of fluid elements at second order. It is also shown that the physical angular momentum and energy of the perturbation are, in general, different from the corresponding canonical quantities.

Paulo M. Sá

2004-04-02T23:59:59.000Z

477

Optics in a nonlinear gravitational wave  

E-Print Network [OSTI]

Gravitational waves can act like gravitational lenses, affecting the observed positions, brightnesses, and redshifts of distant objects. Exact expressions for such effects are derived here, allowing for arbitrarily-moving sources and observers in the presence of plane-symmetric gravitational waves. The commonly-used predictions of linear perturbation theory are shown to be generically overshadowed---even for very weak gravitational waves---by nonlinear effects when considering observations of sufficiently distant sources; higher-order perturbative corrections involve secularly-growing terms which cannot necessarily be neglected. Even on more moderate scales where linear effects remain at least marginally dominant, nonlinear corrections are qualitatively different from their linear counterparts. There is a sense in which they can, for example, mimic the existence of a third type of gravitational wave polarization.

Harte, Abraham I

2015-01-01T23:59:59.000Z

478

Scaling of chaos in strongly nonlinear lattices  

SciTech Connect (OSTI)

Although it is now understood that chaos in complex classical systems is the foundation of thermodynamic behavior, the detailed relations between the microscopic properties of the chaotic dynamics and the macroscopic thermodynamic observations still remain mostly in the dark. In this work, we numerically analyze the probability of chaos in strongly nonlinear Hamiltonian systems and find different scaling properties depending on the nonlinear structure of the model. We argue that these different scaling laws of chaos have definite consequences for the macroscopic diffusive behavior, as chaos is the microscopic mechanism of diffusion. This is compared with previous results on chaotic diffusion [M. Mulansky and A. Pikovsky, New J. Phys. 15, 053015 (2013)], and a relation between microscopic chaos and macroscopic diffusion is established.

Mulansky, Mario, E-mail: mulansky@pks.mpg.de [Department of Physics and Astronomy, Potsdam University, Karl-Liebknecht-Str. 24, D-14476 Potsdam-Golm (Germany) [Department of Physics and Astronomy, Potsdam University, Karl-Liebknecht-Str. 24, D-14476 Potsdam-Golm (Germany); Max-Planck-Institut für Physik komplexer Systeme, Nöthnitzer Str. 38, D-01187 Dresden (Germany); Institut für Theoretische Physik, TU Dresden, Zellescher Weg 17, D-01069 Dresden (Germany)

2014-06-15T23:59:59.000Z

479

Transient multiwave mixing in a nonlinear medium  

Science Journals Connector (OSTI)

We present a detailed quantitative theory of transient multiwave mixing effects in a nonlinear medium produced by two incident coherent laser beams. Our theory accounts for all the relevant parameters such as laser pulse widths, medium response times, nonlinearities, interaction length, intensities, beam ratio, phase-modulation effects, losses, side diffractions, and explicitly shows how the dynamics and the multiwave mixing processes are interrelated with these parameters. The crucial role played by the diffracted beams and the time-dependent phase shifts among the beams and the interplay among the various intensity and index gratings are explicitly evaluated. In particular, the gain experienced by a weak incident probe beam via these mixing effects from the incident strong pump beam is investigated as a function of the aforementioned parameters.

I. C. Khoo and Ping Zhou

1990-02-01T23:59:59.000Z

480

Heat flow in nonlinear molecular junctions  

E-Print Network [OSTI]

We investigate the heat conduction properties of molecular junctions comprising anharmonic interactions. We find that nonlinear interactions can lead to novel phenomena: it negative differential thermal conductance and heat rectification. Based on analytically solvable models we derive an expression for the heat current that clearly reflects the interplay between anharmonic interactions, strengths of coupling to the thermal reservoirs, and junction asymmetry. This expression indicates that negative differential thermal conductance shows up when the molecule is strongly coupled to the thermal baths, even in the absence of internal molecular nonlinearities. In contrast, diode like behavior is expected for a highly anharmonic molecule with an inherent structural asymmetry. Anharmonic interactions are also necessary for manifesting Fourier type transport. We briefly present an extension of our model system that can lead to this behavior.

Dvira Segal

2005-12-22T23:59:59.000Z

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481

Parametric resonance and nonlinear string vibrations  

Science Journals Connector (OSTI)

Periodic changes in the tension of a taut string parametrically excite transverse motion in the string when the driving frequency is close to twice the natural frequency of any transverse normal mode of the string. The literature on this phenomenon is synthesized and extended to include the effects of damping as well as nonlinearity. It is shown that it is nonlinearity rather than damping that limits the growth of a resonantly excited mode although damping is needed for steady-state oscillations to occur. The validity of the usual approximation that the string tension depends only on time and not on space is checked by modeling a string as point masses joined by massless linear springs. It is found that although this approximation is likely to be violated in practice the violation does not have a significant effect on the results. The source of the disagreement in the literature for the speed of longitudinal waves in a stretched string is identified.

2004-01-01T23:59:59.000Z

482

Utility System Simulation: A Nonlinear Approach  

E-Print Network [OSTI]

UTILITY SYSTEM SIMULATION: A NONLINEAR APPROACH STEPHEN R. DELK, P.E. Owner The MESA Company The Woodlands, Texas ABSTRACT Computer simulation of plant utility systems allows an engineer to rapidly I) analyze operation changes, 2...) analyze design changes, and 3) optimize the steam/electric system for the lowest operating cost. MESA (Modular Energy System Analyzer) is a PC-based computer program that can be configured to accurately simulate plant utility systems. MESA uses a...

Delk, S. R.

483

Computing nonlinear force free coronal magnetic fields  

E-Print Network [OSTI]

Knowledge of the structure of the coronal magnetic field is important for our understanding of many solar activity phenomena, e.g. flares and CMEs. However, the direct measurement of coronal magnetic fields is not possible with present methods, and therefore the coronal field has to be extrapolated from photospheric measurements. Due to the low plasma beta the coronal magnetic field can usually be assumed to be approximately force free, with electric currents flowing along the magnetic field lines. There are both observational and theoretical reasons which suggest that at least prior to an eruption the coronal magnetic field is in a nonlinear force free state. Unfortunately the computation of nonlinear force free fields is way more difficult than potential or linear force free fields and analytic solutions are not generally available. We discuss several methods which have been proposed to compute nonlinear force free fields and focus particularly on an optimization method which has been suggested recently. We compare the numerical performance of a newly developed numerical code based on the optimization method with the performance of another code based on an MHD relaxation method if both codes are applied to the reconstruction of a semi-analytic nonlinear force-free solution. The optimization method has also been tested for cases where we add random noise to the perfect boundary conditions of the analytic solution, in this way mimicking the more realistic case where the boundary conditions are given by vector magnetogram data. We find that the convergence properties of the optimization method are affected by adding noise to the boundary data and we discuss possibilities to overcome this difficulty.

T. Wiegelmann; T. Neukirch

2008-01-21T23:59:59.000Z

484

Particle systems and nonlinear Landau damping  

SciTech Connect (OSTI)

Some works dealing with the long-time behavior of interacting particle systems are reviewed and put into perspective, with focus on the classical Kolmogorov–Arnold–Moser theory and recent results of Landau damping in the nonlinear perturbative regime, obtained in collaboration with Clément Mouhot. Analogies are discussed, as well as new qualitative insights in the theory. Finally, the connection with a more recent work on the inviscid Landau damping near the Couette shear flow, by Bedrossian and Masmoudi, is briefly discussed.

Villani, Cédric, E-mail: villani@math.univ-lyon1.fr [Université de Lyon and Institut Henri Poincaré, 11 rue Pierre et Marie Curie, F-75231 Paris Cedex 05 (France)] [Université de Lyon and Institut Henri Poincaré, 11 rue Pierre et Marie Curie, F-75231 Paris Cedex 05 (France)

2014-03-15T23:59:59.000Z

485

The nonlinear dynamics of the sea breeze  

E-Print Network [OSTI]

of the requirements for the degree of MASTER OF SCIENCE Approved as to style and content by: _____________________________ _____________________________ John Nielsen-Gammon Craig C. Epifanio (Co-Chair of Committee... Sciences iii ABSTRACT The Nonlinear Dynamics of the Sea Breeze. (August 2004) Kevin Robert Walter, B.S., Thomas More College Co-Chairs of Advisory Committee: Dr. John Nielsen-Gammon Dr. Craig C. Epifanio...

Walter, Kevin Robert

2004-11-15T23:59:59.000Z

486

Nonlinear regression analysis of field emission data  

E-Print Network [OSTI]

, the current voltage characteristics are highly nonlinear. These properties have enabled field emission cathodes to be used in applications such as cathodoluminescent displays, vacuum triodes and vacuum diodes. The objective of this thesis was to develop... ballistic transport, submil- limeter wave generation and amplification are also possible using vacuum diodes and triodes. Due to the rapid advance of vacuum microelectronic devices toward commercial applications there exists a need to be able...

Barry, Scott Wilson

2012-06-07T23:59:59.000Z

487

Nonlinear analysis of anisotropic shells of revolution  

E-Print Network [OSTI]

Modifications REFERENCES BIBLIOGRAPHY VITA 25 34 41 48 54 55 56 57 LIST OF FIGURES Figure Page l. Shell Geometry 2. Positive Direction for Oisplacements 3. Positive Direction for Rotations 4. Positive Direction for Forces . . . 5. Positive... Direction for Moments 6 . Positive Direction for Loads 7. U Displacement for Conical Shell 8. M Displacement for Conical Shell . 9. M Displacement for Spherical Cap 10. I4 Displacement for 4. 5 psi Load, Linear and Nonlinear Solution . ll. Load vs M...

Kelley, William Rhea

1970-01-01T23:59:59.000Z

488

View Discovery in OLAP Databases through Statistical Combinatorial Optimization  

SciTech Connect (OSTI)

The capability of OLAP database software systems to handle data complexity comes at a high price for analysts, presenting them a combinatorially vast space of views of a relational database. We respond to the need to deploy technologies sufficient to allow users to guide themselves to areas of local structure by casting the space of ``views'' of an OLAP database as a combinatorial object of all projections and subsets, and ``view discovery'' as an search process over that lattice. We equip the view lattice with statistical information theoretical measures sufficient to support a combinatorial optimization process. We outline ``hop-chaining'' as a particular view discovery algorithm over this object, wherein users are guided across a permutation of the dimensions by searching for successive two-dimensional views, pushing seen dimensions into an increasingly large background filter in a ``spiraling'' search process. We illustrate this work in the context of data cubes recording summary statistics for radiation portal monitors at US ports.

Joslyn, Cliff A.; Burke, Edward J.; Critchlow, Terence J.

2009-05-01T23:59:59.000Z

489

Terahertz bandwidth integrated radio frequency spectrum analyzer via nonlinear optics  

E-Print Network [OSTI]

We report an integrated all-optical radio frequency spectrum analyzer based on a ~ 4cm long doped silica glass waveguide, with a bandwidth greater than 2.5 THz. We use this device to characterize the intensity power spectrum of ultrahigh repetition rate mode-locked lasers at repetition rates up to 400 GHz, and observe dynamic noise related behavior not observable with other techniques.

Ferrera, Marcello; Pasquazi, Alessia; Peccianti, Marco; Clerici, Matteo; Caspani, Lucia; Chu, Sai T; Little, Brent E; Morandotti, Roberto; Moss, David J

2014-01-01T23:59:59.000Z

490

Using the scalable nonlinear equations solvers package  

SciTech Connect (OSTI)

SNES (Scalable Nonlinear Equations Solvers) is a software package for the numerical solution of large-scale systems of nonlinear equations on both uniprocessors and parallel architectures. SNES also contains a component for the solution of unconstrained minimization problems, called SUMS (Scalable Unconstrained Minimization Solvers). Newton-like methods, which are known for their efficiency and robustness, constitute the core of the package. As part of the multilevel PETSc library, SNES incorporates many features and options from other parts of PETSc. In keeping with the spirit of the PETSc library, the nonlinear solution routines are data-structure-neutral, making them flexible and easily extensible. This users guide contains a detailed description of uniprocessor usage of SNES, with some added comments regarding multiprocessor usage. At this time the parallel version is undergoing refinement and extension, as we work toward a common interface for the uniprocessor and parallel cases. Thus, forthcoming versions of the software will contain additional features, and changes to parallel interface may result at any time. The new parallel version will employ the MPI (Message Passing Interface) standard for interprocessor communication. Since most of these details will be hidden, users will need to perform only minimal message-passing programming.

Gropp, W.D.; McInnes, L.C.; Smith, B.F.

1995-02-01T23:59:59.000Z

491

Nonlinear Losses Induced in Spherical Waves  

Science Journals Connector (OSTI)

From Naugol'nykh's spherical sawtooth?wave solution curves are constructed which predict the nonlinear induced extra loss in fundamental amplitude. As in the plane wave case the propagation path can be split into three zones. In the first zone nonlinear effects dominate over attenuation. In the second zone a stable distorted waveform is propagated. In the third zone attenuation reduces the amplitude so that nonlinear effects are no longer important. Although the predicted losses are smaller than in the plane wave case they are not negligible. A criterion for cavitation is used in order to define depths in the ocean where cavitation will be the limiting factor on sound power level and not extra losses. By considering a specific example it is concluded that cavitation will indeed be the limiting factor down to a depth of about 2000 ft. At depths below 2000 ft extra losses can become significant for propagation from steady?state spherical sources operating below the cavitation threshold.

Boyd B. Cary

1967-01-01T23:59:59.000Z

492

Non-linear dark energy clustering  

SciTech Connect (OSTI)

We consider a dark energy fluid with arbitrary sound speed and equation of state and discuss the effect of its clustering on the cold dark matter distribution at the non-linear level. We write the continuity, Euler and Poisson equations for the system in the Newtonian approximation. Then, using the time renormalization group method to resum perturbative corrections at all orders, we compute the total clustering power spectrum and matter power spectrum. At the linear level, a sound speed of dark energy different from that of light modifies the power spectrum on observationally interesting scales, such as those relevant for baryonic acoustic oscillations. We show that the effect of varying the sound speed of dark energy on the non-linear corrections to the matter power spectrum is below the per cent level, and therefore these corrections can be well modelled by their counterpart in cosmological scenarios with smooth dark energy. We also show that the non-linear effects on the matter growth index can be as large as 10–15 per cent for small scales.

Anselmi, Stefano; Ballesteros, Guillermo [Dipartimento di Fisica ''G. Galilei'', Università degli Studi di Padova, via Marzolo 8, I-35131 Padua (Italy); Pietroni, Massimo, E-mail: anselmi@pd.infn.it, E-mail: ballesteros@pd.infn.it, E-mail: pietroni@pd.infn.it [INFN — Sezione di Padova, via Marzolo 8, I-35131 Padua (Italy)

2011-11-01T23:59:59.000Z

493

Low loss hollow optical-waveguide connection from atmospheric pressure to ultra-high vacuum  

SciTech Connect (OSTI)

A technique for optically accessing ultra-high vacuum environments, via a photonic-crystal fiber with a long small hollow core, is described. The small core and the long bore enable a pressure ratio of over 10{sup 8} to be maintained between two environments, while permitting efficient and unimpeded delivery of light, including ultrashort optical pulses. This delivery can be either passive or can encompass nonlinear optical processes such as optical pulse compression, deep UV generation, supercontinuum generation, or other useful phenomena.

Ermolov, A.; Mak, K. F.; Tani, F.; Hölzer, P.; Travers, J. C. [Max Planck Institute for the Science of Light, Günther-Scharowsky-Str. 1, 91058 Erlangen (Germany)] [Max Planck Institute for the Science of Light, Günther-Scharowsky-Str. 1, 91058 Erlangen (Germany); Russell, P. St. J. [Max Planck Institute for the Science of Light, Günther-Scharowsky-Str. 1, 91058 Erlangen (Germany) [Max Planck Institute for the Science of Light, Günther-Scharowsky-Str. 1, 91058 Erlangen (Germany); Department of Physics, University of Erlangen-Nuremberg, Günther-Scharowsky-Str. 1, 91058 Erlangen (Germany)

2013-12-23T23:59:59.000Z

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