Abstract
The conversion efficiency of second harmonic wave in two-dimensional nonlinear photonic crystals consisting of square lattice and reversed domains of various shapes and orientations is studied numerically. Different shapes of reversed domains (circle, ellipse, rectangle, and square) are considered. We present numerical results and theoretical validations. The results indicate that for a given lattice symmetry and a fixed filling factor, the conversion efficiency of different order quasiphase matched process can be maximized by adjusting the shape and orientation of the reversed domains.
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