SEMICONDUCTOR DEVICES

摘要

A semiconductor device comprises a base semiconductor portion and first and second elevated semiconductor portions thereon separated by a channel. The uppermost surface of the first elevated semiconductor portion carries a metal electrical contact layer and the uppermost of the second a dielectric layer. The surfaces defining the channel are substantially free of metal and dielectric. The structure can be used in a ridge waveguide laser, the first elevated semiconductor portion constituting the ridge. Distributed feedback corrugations may be incorporated in such devices or in other ridge waveguide structures.