Design of 2D photonic crystals with large absolute band gaps by using a genetic algorithm

摘要

A 2-stage genetic algorithm (GA) is used to design a two-dimensional (2D) photonic crystal of square lattice with the maximal absolute band gap. The unit cell is divided into many square pixels, and each filling pattern of pixels with two dielectric materials corresponds to a chromosome consisting of binary digits of 0 and 1. Two numerical examples are given (in the cases of isotropic and anisotropic structures). In both cases, the GA gives an absolute band gap much larger than those reported before.