2ND-ORDER NONLINEAR POLARIZATION AND HARMONIC-GENERATION IN [11L]-ORIENTED III-V HETEROSTRUCTURES

An analysis of the induced bulk second-order nonlinear polarization as a function of crystallographic orientation for the III-V compound sem iconductors is presented. It is shown that for the {11l} family of pla nes, the largest nonlinear polarization that could act as a source for the generation of second-harmonic fields is for structures prepared o n the (112) surface. The input fundamental fields that interact nonlin early in the media considered here are transverse electric ors-polariz ed with respect to the ((1) over bar 10) surface - which is an orthogo nal natural cleavage plane for the (112) surface.