Patent ID: 6812483
Filing Date: 2004-11-02
Classification: B82Y,G02F,H01L,H01S

Abstract:
An optical semiconductor device including a transparent substrate and an optical semiconductor element formed on said substrate, wherein said element and said substrate are transparent in their entirety in a visible light range, said element having a quantum well structure comprising:a quantum well made of a zinc oxide or a zinc oxide mixed crystal thin film, a barrier layer made of an insulating material selected from the group consisting of SiOx; SiNx; ZnMgO; a homologous compound expressed by the following general formula: RMO3(AO)m, wherein R=Sc, Fe or In, M=In, Fe, Cr, Ga or Al, A=Zn, Mg, Cu, Mn, Fe, Co, Ni or Cd, and m=a natural number; and (Li, Na)(Ga, Al)O2, wherein said element includes a ZnO superlattice structure, and said optical semiconductor device is adapted to intersubband optical transitions of subbands belonging to the same band in said quantum well structure so as to emit and receive light through said ZnO superlattice structure, or to receive light through an effect of intersubband light absorption, or to switch light optically controllably through an effect of intersubband absorption saturation.