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

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

Journal Article · Mon Jan 06 00:00:00 EST 2020 · Optics Express

DOI:https://doi.org/10.1364/OE.378194· OSTI ID:1581217

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

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.

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Research Organization:: Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)

Sponsoring Organization:: National Natural Science Foundation of China (NNSFC); USDOE; USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)

Grant/Contract Number:: AC05-06OR23177

OSTI ID:: 1581217

Alternate ID(s):: OSTI ID: 1607854

Report Number(s):: DOE/OR/23177--4952; JLAB-ACC--19-3144

Journal Information:: Optics Express, Journal Name: Optics Express Journal Issue: 2 Vol. 28; ISSN 1094-4087; ISSN OPEXFF

Publisher:: Optical Society of AmericaCopyright Statement

Country of Publication:: United States

Language:: English

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