Key points are not available for this paper at this time.
Second-order optical nonlinearities associated with intra-subband transitions in AlxGa1-xAS heterostructure exhibiting the quantum size effect are considered and shown to be large under conditions of degenerate doping and nonsymmetric compositional grading. Nonlinearities of between 10-100 times larger than in bulk GaAs seem feasible.
Gurnick et al. (1983) studied this question.