| 摘要 |
PURPOSE:To improve the efficiency of carrier recombination and to condense a light at a core by pressing an active region cylindrically to a substrate and providing a clad layer having a low refractive index around it and a core region therein. CONSTITUTION:A cylindrical hole 10 having 3mum of diameter and 10mum of depth formed by etching is provided at an N<+> type Al0.5Ga0.5As substrate 17, a P<-> type GaAs active region 15 is interposed between an N<-> type Al0.3Ga0.7As clad layer 16 at its outside and a P<+> type Al0.5Ga0.95As core layer 14 at its inside, a carrier recombination occurs in the cylindrical region, and a light is generated. Since the clad layer has a smaller effective refractive index than that of the active region or the core region, the light is condensed at the center of the cylinder. |
