Radiative Property Optimization of Gratings Based on Genetic Algorithm

Grating is one of the most wildly applied optic elements.Different radiation property of the grating made from the same material can be obtained by optimizing its geometry dimensions.In this paper,one-dimensional metal-dielectric nano/micro grating is studied,and 8-12 μm is selected as the target wavelength.The best structure dimension of both single-pair and double-pair grating which set silicon as the dielectric material and the best optic constant of the dielectric material at that dimension can be obtained by combining Rigorous Coupled-Wave Analysis and Genetic Algorithm to regulate and control the radiation property at any range of target wavelength.Furthermore,it can be a new way to enhance the radiation property of nano/micro gratings.