T
Takashi Saka
Researcher at Daido University
Publications - 62
Citations - 771
Takashi Saka is an academic researcher from Daido University. The author has contributed to research in topics: Superlattice & Diffraction. The author has an hindex of 13, co-authored 62 publications receiving 754 citations.
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Journal ArticleDOI
Large enhancement of spin polarization observed by photoelectrons from a strained GaAs layer
Toru Nakanishi,H. Aoyagi,Hiromichi Horinaka,Yoshihiro Kamiya,T. Kato,Shigeo Nakamura,Takashi Saka,Mitsuru Tsubata +7 more
TL;DR: In this article, the spin polarization of photoelectrons emitted from a 0.08 μm thick strained GaAs(001) layer grown on a GaPxAs1−x substrate by the MOCVD method with x=0.17 was observed.
Journal ArticleDOI
Highly polarized electrons from GaAs–GaAsP and InGaAs–AlGaAs strained-layer superlattice photocathodes
Takeo Nishitani,Tsutomu Nakanishi,Masahiro Yamamoto,S. Okumi,F. Furuta,M. Miyamoto,Makoto Kuwahara,Naoto Yamamoto,K. Naniwa,Osamu Watanabe,Yoshikazu Takeda,Hisashi Kobayakawa,Y. Takashima,Hiromichi Horinaka,Tetsuya Matsuyama,K. Togawa,Takashi Saka,M. Tawada,T. Omori,Yoshimasa Kurihara,Masakazu Yoshioka,K. Kato,Toshio Baba +22 more
TL;DR: In this article, GaAs-GaAsP and InGaAs-AlGaAs strained-layer superlattice photocathodes are presented as emission sources for highly polarized electron beams.
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GaAs/GaAlAs surface emitting IR LED with Bragg reflector grown by MOCVD
TL;DR: In this paper, a double heterostructure and a Bragg reflector consisting of 25 pairs of Ga 1− x Al x As/GaAs multilayers (x = 1 or 0.45) between the GaAs substrate and the cladding layer were investigated.
Journal ArticleDOI
Super-High Brightness and High-Spin-Polarization Photocathode
Xiuguang Jin,Naoto Yamamoto,Yasuhide Nakagawa,Atsushi Mano,Takanori Kato,Masatoshi Tanioku,Toru Ujihara,Yoshikazu Takeda,Shoji Okumi,Masahiro Yamamoto,Tsutomu Nakanishi,Takashi Saka,Hiromichi Horinaka,Toshihiro Kato,Tsuneo Yasue,Takanori Koshikawa +15 more
TL;DR: In this article, a GaAs-GaAsP strained superlattice on a GaP substrate was used to enhance the brightness and spin-polarization of a transmission-type photocathode.
Journal ArticleDOI
High brightness and high polarization electron source using transmission photocathode with GaAs-GaAsP superlattice layers
Naoto Yamamoto,Tsutomu Nakanishi,Atsushi Mano,Yasuhide Nakagawa,Shoji Okumi,Masahiro Yamamoto,Taro Konomi,Xiuguang Jin,Toru Ujihara,Yoshikazu Takeda,Takashi Ohshima,Takashi Saka,Toshihiro Kato,Hiromichi Horinaka,Tsuneo Yasue,Takanori Koshikawa,Makoto Kuwahara +16 more
TL;DR: In this article, a 20kV GaAs-polarized electron source was constructed with a transmission photocathode including an active layer of a GaAs−GaAsP superlattice layer.