基于导模共振效应的宽带宽透射型滤波器的设计与优化（英文）

Design and Optimization of Wide-band Filter Based on Guided Mode Resonant Grating

基于导模共振理论,设计了一种工作中心波长位于632.8nm的宽带宽透射型滤波器.根据瑞利异常理论公式,计算得到瑞利波长所在的光谱位置,从而证明异常现象对滤波器的带宽产生了拓宽作用.为了优化宽带宽滤波器的结构参数,利用严格耦合波理论通过计算不同参数条件下的光谱,分析了结构参数和材料对于透射光谱在带宽和峰值效率方面的影响,选取其中最佳的结构参数数值和材料,得到峰值效率为90%、带宽为95nm的透射光谱.该宽带宽透射型导模共振器件在显示和成像领域有潜在的应用价值.

A kind of wide-band filter based on guided mode resonance effect was proposed.According to the theory of Rayleigh anomalies,the existence of the phenomenon was proved to have the influence to broaden the bandwidth through calculating the position of the Rayleigh wavelength.The spectrums under the conditions of different structural parameters and materials were obtained based on rigious coulpedwave analysis method.The impact of the parameters on transmittance efficiency and bandwidth could be clearly observed and concluded from the theoretical results.The parameters were chosen as the optimum values for obtaining the best trasmission peak and bandwidth.The center wavelength of the transmission spectrum is 632.8nm,the peak transmission efficiency is nearly 90% and the bandwidth is 95 nm according to the calculation result.This kind of device has potential prospect in the application of display and image.