Yasuhiko Arakawa Yasuhiko Arakawa Yasuhiko Arakawa (Japanese , "Arakawa Yasuhiko"; born 6 November 1952) is a Japanese physicist. His research focuses on semiconductor physics, including growth of nanostructures and their optoelectronic applications. Among his main achievements are the proposal of the concept of quantum dots and their application to quantum dot lasers, the observation of exciton-polariton Rabi-splitting in a semiconductor microcavity, or, recently, the first 3D photonic crystal nanocavity lasers with quantum dot gain. Yasuhiko Arakawa received a B.S. degree in 1975 and a Ph.D. degree in 1980, respectively, from the University of Tokyo, both in Electronics Engineering. In 1981 he became
Toru Arakawa the creation of the first " Shatai [Kata] " book, which standardized Kata 's style – encompassing style for JKF competitions. In addition, he trained numerous successful athletes in the 1980s, including Seiji Nishimura and Toshiaki Maeda. Until his death in June 2015, Arakawa taught in his Dōjō Shibuya and at international seminars in Japan and overseas. Toru Arakawa Tōru Arakawa(, " Arakawa Tōru "; November 1932 in Gifu Prefecture, Japan; – 20 June 2015) was a karate master of the style Wadō-ryū. He was one of the few karateka ranked 9th Dan in Japan. Tōru Arakawa began karate training