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
Arakawa River (Fukushima) Tourism. For four years in a row, from 2004 to 2007, the Arakawa River ranked first in water quality among rivers in the Tōhoku region. Arakawa River (Fukushima) The is a river in Fukushima, Fukushima, Japan. The Arakawa River originates from the Azuma Mountain Range and flows eastward into the western part of the Fukushima Basin, joining with other smaller rivers from Mt. Issaikyō, Mt. Higashi-Azuma, and Mt. Tetsu along the way. It eventually terminates into the Abukuma River in the Ogura area of Fukushima City. There are many recreational facilities that line the coast of the Arakawa River as