一维电-磁介质互联的光子晶体偏振带通滤波器

Polarization Band-pass Filters Based on One-dimensional Dielectric and Magnetic Photonic Crystals

传统一维纯电介质光子晶体较难实现TE偏振带通滤波,而且每种偏振滤波器的禁带很窄.本文基于不同电磁参量占主导地位控制不同偏振波禁带较宽的特性,利用一维光子晶体禁带带边交叉的方法设计了TE偏振滤波器、TM偏振滤波器和双偏振滤波器.每种滤波结构均为包含电介质和磁性材料的异质结,因此实现各种滤波的同时也展宽了禁带范围.由于电-磁介质互联,所设计的滤波器结构简单,均具备宽禁带、窄带通滤波特性.此外,利用已报道的磁性材料,分析了磁性材料色散对偏振滤波器性能的影响.

One-dimensional traditional pure dielectric photonic crystals have disadvantages that the design of TE-polarization band-pass filters is difficult,and the bandgaps of TE-and TM-polarization band-pass filters are narrow.Based on the fact that a greater permittivity（permeability） than permeability（permittivity） makes wider TE（TM） bands than TM（TE） bands,three kinds of filters,（TE-polarization band-pass filter,TM-polarization band-pass filter and double-polarization band-pass filter）,were designed by stop-band superposition of one-dimensional photonic crystals.Each of them was a heterostructure constructed by two sub-photonic-crystals,hence the structure provided a narrow-frequency pass-band and the bandgap was enlarged.Due to the combination of dielectric and magnetic materials,the proposed design has simple structures with wide bandgaps and narrow-frequency pass-bands.Besides,the effect of magnetic material dispersion on the performance of polarization filters was discussed using a kind of magnetic material which has been reported.