Mie-type GaAs nanopillar array resonators for negative electron affinity photocathodes

Peng, Xincun; Poelker, Matt; Stutzman, Marcy; Tang, Bin; Zhang, Shukui; Zou, Jijun

doi:10.1364/OE.378194

Title: Mie-type GaAs nanopillar array resonators for negative electron affinity photocathodes

Abstract

This paper presents modeling results of Mie-type GaAs nanopillar array resonant structures and the design of negative electron affinity photocathodes based on Spicer’s three-step model. For direct-bandgap GaAs with high intrinsic absorption coefficient in the 500 ∼ 850 nm spectral range, photoelectrons were found to be highly localized inside the nanopillars near the top and side surfaces where electrons can be efficiently transported and emitted into vacuum, and the light reflectance can be reduced to ∼1% level at resonance wavelengths. Predictions of spectrally resolved photoemission indicate that these nanophotonics resonators, when properly optimized, can increase the photo-electron emission quantum efficiency at resonance wavelengths to levels limited only by the surface-electron escape probability, significantly outperforming traditional flat wafer photocathodes. Ultrafast photoelectric response is also expected from these nanostructured photocathodes due to the much shorter photoelectron transport distance in nanopillars compared to flat wafers. Given these unique optoelectronic properties, GaAs nanophotonic resonance structured photocathodes represent a very promising alternative to photocathodes with flat surfaces that are widely used in many applications today.

Authors:

; Poelker, Matt; Stutzman, Marcy; Tang, Bin; Zhang, Shukui; Zou, Jijun

Publication Date:: Mon Jan 06 00:00:00 EST 2020

Research Org.:: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Nuclear Physics (NP); National Natural Science Foundation of China (NSFC)

OSTI Identifier:: 1581217

Alternate Identifier(s):: OSTI ID: 1607854

Report Number(s):: JLAB-ACC-19-3144; DOE/OR/23177-4952
Journal ID: ISSN 1094-4087; OPEXFF

Grant/Contract Number:: AC05-06OR23177; 11875012; 61204071; 61661002

Resource Type:: Published Article

Journal Name:: Optics Express

Additional Journal Information:: Journal Name: Optics Express Journal Volume: 28 Journal Issue: 2; Journal ID: ISSN 1094-4087

Publisher:: Optical Society of America

Country of Publication:: United States

Language:: English

Subject:: 47 OTHER INSTRUMENTATION

Citation Formats


                    Peng, Xincun, Poelker, Matt, Stutzman, Marcy, Tang, Bin, Zhang, Shukui, and Zou, Jijun. Mie-type GaAs nanopillar array resonators for negative electron affinity photocathodes.  United States: N. p., 2020. 
Web.  doi:10.1364/OE.378194.

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                    Peng, Xincun, Poelker, Matt, Stutzman, Marcy, Tang, Bin, Zhang, Shukui, & Zou, Jijun. Mie-type GaAs nanopillar array resonators for negative electron affinity photocathodes.  United States.  https://doi.org/10.1364/OE.378194

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                    Peng, Xincun, Poelker, Matt, Stutzman, Marcy, Tang, Bin, Zhang, Shukui, and Zou, Jijun. Mon .  
"Mie-type GaAs nanopillar array resonators for negative electron affinity photocathodes".  United States.  https://doi.org/10.1364/OE.378194.

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@article{osti_1581217,

  title        = {Mie-type GaAs nanopillar array resonators for negative electron affinity photocathodes},

  author       = {Peng, Xincun and Poelker, Matt and Stutzman, Marcy and Tang, Bin and Zhang, Shukui and Zou, Jijun},

  abstractNote = {This paper presents modeling results of Mie-type GaAs nanopillar array resonant structures and the design of negative electron affinity photocathodes based on Spicer’s three-step model. For direct-bandgap GaAs with high intrinsic absorption coefficient in the 500 ∼ 850 nm spectral range, photoelectrons were found to be highly localized inside the nanopillars near the top and side surfaces where electrons can be efficiently transported and emitted into vacuum, and the light reflectance can be reduced to ∼1% level at resonance wavelengths. Predictions of spectrally resolved photoemission indicate that these nanophotonics resonators, when properly optimized, can increase the photo-electron emission quantum efficiency at resonance wavelengths to levels limited only by the surface-electron escape probability, significantly outperforming traditional flat wafer photocathodes. Ultrafast photoelectric response is also expected from these nanostructured photocathodes due to the much shorter photoelectron transport distance in nanopillars compared to flat wafers. Given these unique optoelectronic properties, GaAs nanophotonic resonance structured photocathodes represent a very promising alternative to photocathodes with flat surfaces that are widely used in many applications today.},

  doi          = {10.1364/OE.378194},

  journal      = {Optics Express},

  number       = 2,

  volume       = 28,

  place        = {United States},

  year         = {Mon Jan 06 00:00:00 EST 2020},

  month        = {Mon Jan 06 00:00:00 EST 2020}

}

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Works referenced in this record:

High voltage studies of inverted-geometry ceramic insulators for a 350 kV DC polarized electron gun
journal, February 2016

Hernandez-Garcia, C.; Poelker, M.; Hansknecht, J.
IEEE Transactions on Dielectrics and Electrical Insulation, Vol. 23, Issue 1
DOI: 10.1109/TDEI.2015.005126

Ultrabright and Ultrafast III–V Semiconductor Photocathodes
journal, March 2014

Karkare, Siddharth; Boulet, Laurent; Cultrera, Luca
Physical Review Letters, Vol. 112, Issue 9
DOI: 10.1103/PhysRevLett.112.097601

Patterned negative electron affinity photocathodes for maskless electron beam lithography
journal, November 1998

Schneider, J. E.
Journal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures, Vol. 16, Issue 6
DOI: 10.1116/1.590349

Perspectives on Designer Photocathodes for X-ray Free-Electron Lasers: Influencing Emission Properties with Heterostructures and Nanoengineered Electronic States
journal, October 2018

Moody, Nathan A.; Jensen, Kevin L.; Shabaev, Andrew
Physical Review Applied, Vol. 10, Issue 4
DOI: 10.1103/PhysRevApplied.10.047002

Effect of crystal quality on performance of spin-polarized photocathode
journal, November 2014

Jin, Xiuguang; Ozdol, Burak; Yamamoto, Masahiro
Applied Physics Letters, Vol. 105, Issue 20
DOI: 10.1063/1.4902337

GaAs nanopillar-array solar cells employing in situ surface passivation
journal, February 2013

Mariani, Giacomo; Scofield, Adam C.; Hung, Chung-Hong
Nature Communications, Vol. 4, Issue 1
DOI: 10.1038/ncomms2509

Image intensification
journal, March 2010

Wehmeijer, Jeroen; van Geest, Bert
Nature Photonics, Vol. 4, Issue 3
DOI: 10.1038/nphoton.2010.21

Single-nanowire solar cells beyond the Shockley–Queisser limit
journal, March 2013

Krogstrup, Peter; Jørgensen, Henrik Ingerslev; Heiss, Martin
Nature Photonics, Vol. 7, Issue 4
DOI: 10.1038/nphoton.2013.32

Direct-Bandgap Epitaxial Core–Multishell Nanopillar Photovoltaics Featuring Subwavelength Optical Concentrators
journal, March 2013

Mariani, Giacomo; Zhou, Zhengliu; Scofield, Adam
Nano Letters, Vol. 13, Issue 4
DOI: 10.1021/nl400083g

Negative affinity 3–5 photocathodes: Their physics and technology
journal, February 1977

Spicer, W. E.
Applied Physics, Vol. 12, Issue 2
DOI: 10.1007/BF00896137

Empirical low-field mobility model for III–V compounds applicable in device simulation codes
journal, March 2000

Sotoodeh, M.; Khalid, A. H.; Rezazadeh, A. A.
Journal of Applied Physics, Vol. 87, Issue 6
DOI: 10.1063/1.372274

Semiconductor Nanowire Optical Antenna Solar Absorbers
journal, February 2010

Cao, Linyou; Fan, Pengyu; Vasudev, Alok P.
Nano Letters, Vol. 10, Issue 2
DOI: 10.1021/nl9036627

On optical properties of GaAs and GaAs/AlGaAs core-shell periodic nanowire arrays
journal, March 2011

Gu, Zongquan; Prete, Paola; Lovergine, Nicola
Journal of Applied Physics, Vol. 109, Issue 6
DOI: 10.1063/1.3555096

Scanning ultrafast electron microscopy: A novel technique to probe photocarrier dynamics with high spatial and temporal resolutions
journal, September 2017

Liao, Bolin; Najafi, Ebrahim
Materials Today Physics, Vol. 2
DOI: 10.1016/j.mtphys.2017.07.003

Broadband omnidirectional antireflection coating based on subwavelength surface Mie resonators
journal, January 2012

Spinelli, P.; Verschuuren, M. A.; Polman, A.
Nature Communications, Vol. 3, Issue 1
DOI: 10.1038/ncomms1691

Enhanced external quantum efficiency in rectangular single nanowire solar cells
journal, January 2013

Li, Xiaofeng; Zhan, Yaohui
Applied Physics Letters, Vol. 102, Issue 2
DOI: 10.1063/1.4775578

First Lasing of the CAEP THz FEL facility Driven by a Superconducting Accelerator
journal, September 2018

Wu, Dai; Li, Ming; Yang, Xinfan
Journal of Physics: Conference Series, Vol. 1067
DOI: 10.1088/1742-6596/1067/3/032010

Optically resonant dielectric nanostructures
journal, November 2016

Kuznetsov, Arseniy I.; Miroshnichenko, Andrey E.; Brongersma, Mark L.
Science, Vol. 354, Issue 6314
DOI: 10.1126/science.aag2472

Meta-Optics with Mie Resonances
journal, January 2017

Kivshar, Yuri; Miroshnichenko, Andrey
Optics and Photonics News, Vol. 28, Issue 1
DOI: 10.1364/OPN.28.1.000024

Analysis of quantum efficiency improvement in spin-polarized photocathode
journal, October 2016

Jin, Xiuguang; Ohki, Shunsuke; Ishikawa, Tomoki
Journal of Applied Physics, Vol. 120, Issue 16
DOI: 10.1063/1.4965723

Improved activation technique for preparing high-efficiency GaAs photocathodes
journal, January 2017

Zhang, Yijun; Qian, Yunsheng; Feng, Cheng
Optical Materials Express, Vol. 7, Issue 9
DOI: 10.1364/OME.7.003456

Theoretical analysis and modeling of light trapping in high efficicency GaAs nanowire array solar cells
journal, October 2011

Wen, Long; Zhao, Zhifei; Li, Xinhua
Applied Physics Letters, Vol. 99, Issue 14
DOI: 10.1063/1.3647847

Maximum intensity, transmission limited cold electron beams from GaAs photocathode in the eV and sub-eV kinetic energy range
journal, March 2014

Shornikov, A.; Orlov, D. A.; Krantz, C.
Physical Review Special Topics - Accelerators and Beams, Vol. 17, Issue 4
DOI: 10.1103/PhysRevSTAB.17.042802

Variation of quantum-yield curves for GaAs photocathodes under illumination
journal, February 2007

Zou, Jijun; Chang, Benkang; Chen, Huailin
Journal of Applied Physics, Vol. 101, Issue 3
DOI: 10.1063/1.2435075

Photoemission from advanced heterostructured Al_xGa_1-xAs/GaAs photocathodes under multilevel built-in electric field
journal, January 2015

Feng, Cheng; Zhang, Yijun; Qian, Yunsheng
Optics Express, Vol. 23, Issue 15
DOI: 10.1364/OE.23.019478

All-dielectric metamaterials
journal, January 2016

Jahani, Saman; Jacob, Zubin
Nature Nanotechnology, Vol. 11, Issue 1
DOI: 10.1038/nnano.2015.304

Production of Highly Polarized Positrons Using Polarized Electrons at MeV Energies
journal, May 2016

Abbott, D.; Adderley, P.; Adeyemi, A.
Physical Review Letters, Vol. 116, Issue 21
DOI: 10.1103/PhysRevLett.116.214801

Functional Meta-Optics and Nanophotonics Governed by Mie Resonances
journal, October 2017

Kruk, Sergey; Kivshar, Yuri
ACS Photonics, Vol. 4, Issue 11
DOI: 10.1021/acsphotonics.7b01038

Spectral sensitivity of graded composition AlGaAs/GaAs nanowire photodetectors
journal, November 2016

Zou, Jijun; Zhao, Wenjun; Ding, Xiaojun
Applied Physics A, Vol. 122, Issue 12
DOI: 10.1007/s00339-016-0532-7

Photoemission characteristics of graded band-gap AlGaAs/GaAs wire photocathode
journal, May 2016

Ding, Xiaojun; Ge, Xiaowan; Zou, Jijun
Optics Communications, Vol. 367
DOI: 10.1016/j.optcom.2016.01.031

Absorption and Scattering of Light by Small Particles
book, April 1998

Bohren, Craig F.; Huffman, Donald R.
DOI: 10.1002/9783527618156

Improved quantum efficiency and stability of GaAs photocathode using favorable illumination during activation
journal, July 2019

Feng, Cheng; Zhang, Yijun; Qian, Yunsheng
Ultramicroscopy, Vol. 202
DOI: 10.1016/j.ultramic.2019.04.010

Designing dielectric resonators on substrates: Combining magnetic and electric resonances
journal, January 2013

van de Groep, J.; Polman, A.
Optics Express, Vol. 21, Issue 22
DOI: 10.1364/OE.21.026285

Efficient tool flow for 3D photovoltaic modelling
journal, August 2015

Rahman, Tasmiat; Fobelets, Kristel
Computer Physics Communications, Vol. 193
DOI: 10.1016/j.cpc.2015.03.016

NEA photocathode for SEM application
journal, June 2003

Ohshima, T.
Microelectronic Engineering, Vol. 67-68
DOI: 10.1016/S0167-9317(03)00159-X

Light-trapping in photon enhanced thermionic emitters
journal, January 2015

Buencuerpo, Jerónimo; Llorens, José M.; Zilio, Pierfrancesco
Optics Express, Vol. 23, Issue 19
DOI: 10.1364/OE.23.0A1220

Effects of ion bombardment on bulk GaAs photocathodes with different surface-cleavage planes
journal, October 2016

Liu, Wei; Zhang, Shukui; Stutzman, Marcy
Physical Review Accelerators and Beams, Vol. 19, Issue 10
DOI: 10.1103/PhysRevAccelBeams.19.103402

Negative electron affinity GaAs wire-array photocathodes
journal, January 2016

Zou, Jijun; Ge, Xiaowan; Zhang, Yijun
Optics Express, Vol. 24, Issue 5
DOI: 10.1364/OE.24.004632

Monte Carlo charge transport and photoemission from negative electron affinity GaAs photocathodes
journal, March 2013

Karkare, Siddharth; Dimitrov, Dimitre; Schaff, William
Journal of Applied Physics, Vol. 113, Issue 10
DOI: 10.1063/1.4794822

MCP detector development for UV space missions
journal, March 2018

Conti, Lauro; Barnstedt, Jürgen; Hanke, Lars
Astrophysics and Space Science, Vol. 363, Issue 4
DOI: 10.1007/s10509-018-3283-4

High-quantum-efficiency ultraviolet solar-blind AlGaN photocathode detector with a sharp spectral sensitivity threshold at 300 nm
journal, January 2018

Tang, Guanghua; Yan, Feng; Chen, Xinlong
Applied Optics, Vol. 57, Issue 27
DOI: 10.1364/AO.57.008060

Photocathodes for High Brightness Photo Injectors
journal, January 2015

Xiang, Rong; Teichert, Jochen
Physics Procedia, Vol. 77
DOI: 10.1016/j.phpro.2015.11.010

Record-level quantum efficiency from a high polarization strained GaAs/GaAsP superlattice photocathode with distributed Bragg reflector
journal, December 2016

Liu, Wei; Chen, Yiqiao; Lu, Wentao
Applied Physics Letters, Vol. 109, Issue 25
DOI: 10.1063/1.4972180

Broadband Quantum Efficiency Enhancement in High Index Nanowire Resonators
journal, April 2015

Yang, Yiming; Peng, Xingyue; Hyatt, Steven
Nano Letters, Vol. 15, Issue 5
DOI: 10.1021/acs.nanolett.5b01008

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Title: Mie-type GaAs nanopillar array resonators for negative electron affinity photocathodes

Abstract

Citation Formats

High voltage studies of inverted-geometry ceramic insulators for a 350 kV DC polarized electron gun journal, February 2016

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Patterned negative electron affinity photocathodes for maskless electron beam lithography
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journal, October 2016

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Maximum intensity, transmission limited cold electron beams from GaAs photocathode in the eV and sub-eV kinetic energy range
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Production of Highly Polarized Positrons Using Polarized Electrons at MeV Energies
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Functional Meta-Optics and Nanophotonics Governed by Mie Resonances
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Absorption and Scattering of Light by Small Particles
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Improved quantum efficiency and stability of GaAs photocathode using favorable illumination during activation
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journal, January 2013

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journal, August 2015

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Effects of ion bombardment on bulk GaAs photocathodes with different surface-cleavage planes
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Negative electron affinity GaAs wire-array photocathodes
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Monte Carlo charge transport and photoemission from negative electron affinity GaAs photocathodes
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MCP detector development for UV space missions
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