Abstract

In recent years, absorption saturation mechanisms have been actively investigated in multiple quantum wells (MQW) in relation to carrier escape processes.¹ However, there have been few reports on carrier transport processes and on absorption saturation mechanisms in thin-barrier superlattices (SLs) under high intensity optical excitation. In this letter, absorption saturation mechanism is studied in short-period superlattices (SPSLs). We have found a novel carrier transport process caused by electric field screening by the photo-generated space charge of remaining holes due to effective mass filtering.

© 1995 IEEE