基于光子晶体环形腔的滤波与分束器件设计  

Design of Filter and Beam Aplitting Device Based on Photonic Crystal Ring Cavity

作　　者：吴聪 孙晶[1] 苏慕阳 钟亮 WU Cong;SUN Jing;SU Muyang;ZHONG Liang(College of Physics and Electromechanical Engineering,Jishou University,Jishou 416000,Hunan China)

机构地区：[1]吉首大学物理与机电工程学院,湖南吉首416000

出　　处：《吉首大学学报（自然科学版）》2022年第2期38-44,共7页Journal of Jishou University(Natural Sciences Edition)

基　　金：吉首大学研究生校级科研项目(JDY21024)。

摘　　要：基于光子晶体环形腔与波导之间的共振耦合原理,设计了一款由环形缺陷和线缺陷组成的三端口二维三角晶格光子晶体双功能器件.运用平面波展开法和时域有限差分法分析了光波在器件结构中的传输特性,得到了传输特性曲线和光场分布,然后讨论了环形腔中心柱数量和疏密程度对输出端口透射率的影响.结果表明,通过调节环形腔中心介质柱的数量可进行选频,当环形腔中心柱数量为5时,器件可实现波长1.346,1.455μm的滤波功能与波长1.414μm的波束均分功能;根据中心柱水平和竖直方向的间距对透射率的影响规律,得到器件的最佳结构参数,以及器件的滤波与分束波长透射率.Based on the resonance coupling principle of photonic crystal ring cavity and waveguide,a three-port photonic crystal dual-function device with two-dimensional triangular lattice was designed,which was composed of ring defect and line defect.The plane wave expansion method and the finite difference time domain method were used to analyze the transmission characteristics of optical wave in the device,and thus the transmission characteristic curve and the light field distribution were obtained.Then the influence of the number and density of the central dielectric column on the transmission efficiency of the output port was discussed.The results show that the frequency can be selected by adjusting the number of central dielectric columns.When the number of medium column was 5,the device achieved the filtering function of 1.346μm,1.455μm and beam splitting function of 1.414μm.According to the influence of the horizontal and vertical spacing of the central column on the transmittance,the optimal structure parameters of the device was obtained,and the transmittance of the filter wavelength and beam splitting wavelength of the device are calculated.

关 键 词：光子晶体 三角晶格 环形谐振腔 中心介质柱 

分 类 号：TN252[电子电信—物理电子学]