Overlap integral analysis for second-harmonic generation within inverted waveguide using mode dispersion phase match

We have discussed the design of a multilayer waveguide toward an efficient nonlinear interaction. We have investigated five- and seven-layer inverted waveguides. The effect of the interlayer thickness and refractive index on the waveguide overlap integral and phase match thickness has been described. A simple approach for improving the nonlinear interaction within an inverted waveguide through maximization of the overlap integral is presented.