Improving sideband of chiral photonic crystal based on PSTD approach

A pseudospectral time-domain approach (PSTD) is proposed for the first time to treat one-dimensional photonic crystal with bi-isotropic chiral media. It is proved that PSTD method has the computational advantages over finite-difference time-domain (FDTD) method. The switching schemes based on the defect and the sidebands are summarized, and the idea of utilizing the smoothed sideband is also introduced. Compared with several apodization types, the envelop functions are emphasized, which benefits a switch with enough contrast below a certain limited threshold.