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中文摘要：
基于光子晶体的光子局域特性,并利用液晶的电控双折射效应,设计了一种新型的多通道可调滤波器。采用传输矩阵法对该滤波器的光学传输特性进行了数值模拟,分析了透射谱与晶体结构参数的关系,讨论了大角度入射光子晶体时电控双折射效应对透射谱的影响。结果表明：当入射角为89°时会出现多个间距不等的高透射率的透射峰。随着各液晶层折射率的增加,缺陷模发生红移。当向光子晶体施加电压时,透射峰的位置发生蓝移,但透射峰峰值大体不变,从而验证了此滤波器的可调节性。该光子晶体滤波器结构简单,可调谐性好,在波分复用系统光源、光谱分析仪和信道监测中有一定的应用价值。
英文摘要：
A multi-channel tunable filter is designed based on the photonic local feature of photonic crystals and the electronically controlled birefringence efficiency of the liquid crystals.The optical transmission characteristics of the filter are simulated by using the transfer matrix method.The relationship between the transmission spectrum and the structure parameters of the crystal is analyzed.The impact that the electronically controlled birefringence efficiency make to the transmission spectrum of the photonic crystals when the incident angle is big are discussed.The results show that many transmission peaks with high transmittance but the interval unequal appear in the transmission spectrum when the incident angle is 89-degree.The defect mode occur red shift with the increase of the refractive index of the liquid crystal layers.While bringing the voltage to bear on the photonic crystals,the location of the transmission peaks make blue shift,but the peaks＇ transmittance are same roughly,so the filter＇s tunable property is verified.This photonic crystal filter with good tunability has simple structure which has some certain applications in the light source of WDM system,the spectrum analyzer and the channel monitoring.
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