光子晶体偏振分光镜的优化设计

提出了一种二维光子晶体偏振分光镜的设计方法,介绍了光栅基板上用Ge/BaF₂ 多层膜实现二维光子晶体偏振分光镜的优化设计.结果表明，TE模式的光子禁带宽度为0083(2πc/a, a是光栅的周期),设计的偏振波长从172μm到24μm，相对带宽为331％.此光子晶体偏振器件制作简单,具有实用性. 关键词： 偏振分光镜 光子晶体 光子禁带

Optimal design of two-dimensional photonic crystal polarization splitters

A method for designing two-dimensional photonic crystal polarization splitters is put forward. Optimal structure of a two-dimensional photonic crystal with a t riangular lattice of Ge rectanglular rods in BaF₂ is presented. It is shown ho w a maximum photonic band-gap for TE mode is obtained by choosing the proper wid th of the rectangular rods. The two-dimensional bandgap for TE mode of this design is 0.083(2πc/a, here a is the period of grating). The polarization frequency band corresponds to a wavelength band ranging from 172 to 24μm, with the theoretical relative bandwidth being 33.1%. The fabrication of such a pho tonic crystal polarization splitter is an easy process based on coating films on the grating and is suitable for industrial making.