一种新型光子晶体环形腔THz波滤波器

A novel photonic crystal ring resonator-based THz filter

文章提出一种新型光子晶体环形腔THz波滤波器,在该滤波器的光子晶体环形腔内部引入一个正方形介质柱,四周各引入一个散射介质柱,基底材料采用折射率n=3.4的硅,晶格常数A为30μm。应用基于FDTD(时域有限差分法)的Rsoft软件进行仿真分析,结果表明,当介质柱半径为5.157 5μm,内部正方形介质柱边长为92μm且其旋转角为6°,散射介质柱半径为5μm时,94.053μm波长的透射率为0.985 56。

In this paper,a novel photonic crystal ring resonator-based THz filter is proposed.In the resonator,a square dielectric rod is introduced and a scattering dielectric rod is introduced to each side of the rod.Silicon with refractive index n =3.4is used as the substrate material with the lattice constant Aof 30μm.This filter is simulated and analyzed by using the FDTDbased Rsoft software and the results show that when the dielectric rod radius Ris 5.157 5μm,the side length of the internal square dielectric rod Lis 92μm with a rotation angle of 6°and the scattering dielectric rod radius R1 is 5μm,the transmittance at the wavelength of 94.053μm is 0.985 56.