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Title: Optical-Resonance-Enhanced Photoemission from Nanostructured GaAs Photocathodes

Journal Article · · Physical Review Applied
ORCiD logo [1];  [2];  [2];  [3];  [4];  [4];  [2];  [4];  [5]
  1. East China Univ. of Technology, Nanchang (China). Engineering Research Center of New Energy Technology of Jiangxi Province; Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  2. East China Univ. of Technology, Nanchang (China). Engineering Research Center of New Energy Technology of Jiangxi Province
  3. College of William and Mary, Williamsburg, VA (United States)
  4. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  5. East China Univ. of Technology, Nanchang (China). Engineering Research Center of New Energy Technology of Jiangxi Province; Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); College of William and Mary, Williamsburg, VA (United States)

A negative electron affinity photocathode based on GaAs nanopillar-array (NPA) Mie-type resonators is demonstrated and significant quantum efficiency enhancement is observed. Nanophotonic resonance assisted photoelectron emission into vacuum is investigated, indicating an enhanced density of optical states due to increased light concentration and increased electron emission area. For visible wavelengths, the Mie resonances in GaAs NPA reduce light reflectivity to less than 6% compared to a typical value >35% and result in maximum quantum efficiency 3.5 times greater than a GaAs wafer photocathode without the NPA structure. In conclusion, comprehensive simulations and experimental studies are presented.

Research Organization:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Organization:
USDOE
OSTI ID:
1577074
Report Number(s):
JLAB-ACC--19-3042; DOE/OR/23177--4781
Journal Information:
Physical Review Applied, Journal Name: Physical Review Applied Journal Issue: 6 Vol. 12; ISSN 2331-7019; ISSN PRAHB2
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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