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Yasuhiko Arakawa -LRB- Japanese 荒川 泰彦 , Arakawa Yasuhiko ; born 6 November 1952 -RRB- is a Japanese physicist .. Japanese. Japanese people. physicist. physicist. His research focuses on semiconductor physics , including growth of nanostructures and their optoelectronic applications .. semiconductor physics. semiconductor physics. growth. Epitaxy. nanostructures. nanostructures. optoelectronic. optoelectronic. 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 .