为了研究基于光子晶体波导的高性能滤波器, 采用调节谐振腔结构和优化耦合结构等方法, 基于耦合模理论, 在正方格光子晶体中设计了3种光子晶体弯折波导, 并进行了理论分析和仿真验证, 利用时域有限差分法取得了3种波导在S波段及C波段上的工作特性数据。结果表明, 3种波导在不同波段表现出良好的带阻或带通特性, 且其结构截止传输波长和通带传输波长随整体介质柱相对介电常数增加向长波方向移动, 介电常数εr每增加0.3, 截止传输波长和通带传输波长均增加6nm左右。这一结果对微型光传感器、微型光通信器件、集成光路等方面的设计都是有帮助的。

In order to study high performance filters based on photonic crystal waveguide, some methods such as adjusting the structures of resonant cavities and optimizing the coupling regions were adopted in the paper. Three kinds of bent photonic crystal waveguides were designed based on the coupled-mode theory in square dielectric rod photonic crystal. After theoretical analysis and experimental verification, the performance characteristics in the S-band and C-band were studied by the time-domain finite-different method. The results show that, 3 kinds of waveguides have good band stop or band pass characteristics at different wavelengths. Cutoff transmission wavelength and passband transmission wavelength shift toward longer wavelengths with the increase of relative dielectric constant of the overall dielectric column. Cutoff wavelength and transmission wavelength are increased by about 6nm with the increase of dielectric constant εr by 0.3. The study has potential value in the designs of micro optical sensors, micro optical communication devices, optical integrated circuits, etc.