K
Kei Sawada
Researcher at University of Tokyo
Publications - 38
Citations - 2135
Kei Sawada is an academic researcher from University of Tokyo. The author has contributed to research in topics: Photon & Metamaterial. The author has an hindex of 12, co-authored 34 publications receiving 1886 citations.
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Journal ArticleDOI
A compact X-ray free-electron laser emitting in the sub-ångström region
Tetsuya Ishikawa,Hideki Aoyagi,Takao Asaka,Yoshihiro Asano,Noriyoshi Azumi,T. Bizen,H. Ego,Kenji Fukami,Toru Fukui,Yukito Furukawa,Shunji Goto,Hirofumi Hanaki,Toru Hara,Teruaki Hasegawa,Takaki Hatsui,Atsushi Higashiya,T. Hirono,Naoyasu Hosoda,Miho Ishii,Takahiro Inagaki,Yuichi Inubushi,Toshiro Itoga,Yasumasa Joti,Masahiro Kago,Takashi Kameshima,Hiroaki Kimura,Yoichi Kirihara,Akio Kiyomichi,T. Kobayashi,Chikara Kondo,Togo Kudo,Hirokazu Maesaka,Xavier Maréchal,Takemasa Masuda,Shinichi Matsubara,Takahiro Matsumoto,Tomohiro Matsushita,Sakuo Matsui,Mitsuru Nagasono,Nobuteru Nariyama,Haruhiko Ohashi,Toru Ohata,Takashi Ohshima,Shun Ono,Yuji Otake,Choji Saji,Tatsuyuki Sakurai,Takahiro Sato,Kei Sawada,T. Seike,Katsutoshi Shirasawa,Takashi Sugimoto,Shinsuke Suzuki,Sunao Takahashi,Hideki Takebe,Kunikazu Takeshita,Kenji Tamasaku,Hitoshi Tanaka,Ryotaro Tanaka,Takashi Tanaka,Tadashi Togashi,Kazuaki Togawa,Atsushi Tokuhisa,Hiromitsu Tomizawa,Kensuke Tono,Shukui Wu,Makina Yabashi,Mitsuhiro Yamaga,Akihiro Yamashita,Kenichi Yanagida,Chao Zhang,Tsumoru Shintake,Hideo Kitamura,Noritaka Kumagai +73 more
TL;DR: In this paper, the SPring-8 Angstrom Compact Free-Electron Laser (CFEL) was used for sub-angstrom fundamental-wavelength lasing at the Tokyo National Museum.
Journal ArticleDOI
X-ray two-photon absorption competing against single and sequential multiphoton processes
Kenji Tamasaku,Eiji Shigemasa,Yuichi Inubushi,Tetsuo Katayama,Kei Sawada,Hirokatsu Yumoto,Haruhiko Ohashi,Hidekazu Mimura,Makina Yabashi,Kazuto Yamauchi,Tetsuya Ishikawa +10 more
TL;DR: In this article, the first observation of a third-order process induced by an X-ray beam from a free-electron laser is realized in germanium using a 5.6-keV X ray beam.
Journal ArticleDOI
Optical magnetoelectric effect in multiferroic materials: evidence for a Lorentz force acting on a ray of light.
TL;DR: It is theoretically proposed that the optical analog of a Lorentz force acting on a ray of light is realized in multiferroic materials such as GaFeO3 showing the magnetoelectric effect.
Journal ArticleDOI
Chiral meta-molecules consisting of gold nanoparticles and genetically engineered tobacco mosaic virus
Mime Kobayashi,Satoshi Tomita,Kei Sawada,Kiyotaka Shiba,Hisao Yanagi,Ichiro Yamashita,Yukiharu Uraoka +6 more
TL;DR: A chiral meta-molecule in the ultraviolet (UV) and visible (VIS) regions using a complex of Au nanoparticles (NPs) and rod-shaped tobacco mosaic virus (TMV) and peptide-modified TMV is demonstrated.
Journal ArticleDOI
Visualizing the local optical response to extreme-ultraviolet radiation with a resolution of λ/380
TL;DR: In this article, the optical properties of diamond were mapped down to a resolution of λ/380 using ultraviolet and X-ray photons in a nonlinear process, which is the smallest object that can be seen with light at a certain wavelength.