Portal de Periódicos da CAPES

New-Type Photocathode for Polarized Electron Source with Distributed Bragg Reflector

1993; Institute of Physics; Volume: 32; Issue: 12B Linguagem: Inglês

10.1143/jjap.32.l1837

1347-4065

Takashi Saka, Toshihiro Kato, Tsutomu Nakanishi, M. Tsubata, Katsumi Kishino, Hiromichi Horinaka, Yoshihiro Kamiya, Shoji Okumi, Chikako Takahashi, Yasunori Tanimoto, M. Tawada, Kazuaki Togawa, H. Aoyagi, Shinsuke Nakamura,

Atomic and Subatomic Physics Research

In order to increase the quantum efficiency of the strained GaAs photocathode for a highly polarized electron source, we designed a new type of photocathode with a distributed Bragg reflector (DBR). A Fabry-Perot cavity is formed by the DBR and the GaAs surface. A large enhancement of quantum efficiency was observed at the laser wavelength which satisfied the condition for the resonant absorption of incident laser light. Based on this experiment, it appears promising to make a photocathode which has the quantum efficiency of more than ∼1% together with electron spin polarization higher than 80%.