The effect of GaAs/AlGaAs compositional intermixing on second-order susceptibility
Large ?(2)(2?) susceptibilities in the ?=10 ?m range, that correspond to an atmospheric window, have been reported in mesoscopic structures formed by asymmetric abrupt QW. Compositional intermixing has been used to fabricate opto-electronic integrated circuits for telecommunications, in the 1.5 ?m range. In the present communication we investigate by numerical simulation the effect of compositional intermixing on two 10-?m structures: (A) formed by two coupled asymmetric wells and (B) formed by a well with a bottom of two different depths. Intermixing is more effective on lowering ?(2) for structure B while it could possibly be used to optimise structure A.
compositional intermixing optical nonlinearities intraband transitions