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 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 at the Nihon University at the age of 18. At the beginning of the 1960s he traveled to Europe and America together with Tatsuo Suzuki and Hajime Takashima to make karate in the western countries popular. Arakawa served as the manager of the JKF Wadōkai from 1962 to 1979. In 1982, he played a major role in