Optical-Resonance-Enhanced Photoemission from Nanostructured Photocathodes
- 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)
- East China Univ. of Technology, Nanchang (China). Engineering Research Center of New Energy Technology of Jiangxi Province
- College of William and Mary, Williamsburg, VA (United States)
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- 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
Similar Records
Quantum efficiency and lifetime study for negative electron affinity GaAs nanopillar array photocathode
Mie-type GaAs nanopillar array resonators for negative electron affinity photocathodes