Space-charge-induced interband optical nonlinearities in asymmetric coupled quantum wells

摘要

Space-charge-induced optical nonlinearities for asymmetric coupled quantum wells have been studied. Calculations for optimized AlGaAs structures show that a blue-shift of the band gap of 9 meV at a carrier density of 1012cm-2can be obtained. Experimental comparisons with a rectangular well show a large increase in room-temperature nonlinearities.