Numerical modeling of long sub-wavelength patterned structures

摘要

The modeling of Cavity Resonator Integrated Grating Filter (CRIGF) structures, which are long but finite sub wavelength-patterned structures composed with a grating in-out coupler flanked with two Bragg reflectors, is challenging for any numerical method. We show how a numerical code based on RCWA, usually dedicated to model periodic structures, can be used, with minor modifications, to model CRIGFs within a reasonable time of calculation with a personal computer. Our results are in agreement with the calculations based on the FDTD method published in the literature.