Spectral dependence of the absorption coefficient in III-V multiple quantum well structures from transmitted light intensity measurements at a single wavelength

Abstract

We report the development of a useful and a rather simple experimental technique that can be used to determine the wavelength dependence of the absorption coefficient as a function of electric field in III-V compound based multiple quantum well (MQW) devices. In this technique, the absorption coefficient at some wavelength and applied electric field is extracted from measurement of the transmitted light intensity through the MQW device at a fixed wavelength as a function of the applied electric field. Results show good agreement with direct measurements of the absorption coefficient.