基于蚁群算法的二维多层亚波长光栅结构设计  

Structure design of two-dimensional multilayer subwavelength grating based on ant colony algorithm

作　　者：汤超龙 赵永强[1,2] 刘芯羽 TANG Chao-Long;ZHAO Yong-Qiang;LIU Xin-Yu(School of Automation,Northwestern Polytechnical University,Xi’an 710129,China;Research&Development Institute of Northwestern Polytechnical University,Shenzhen 518057,China)

机构地区：[1]西北工业大学自动化学院,陕西西安710129 [2]西北工业大学深圳研究院,广东深圳518057

出　　处：《红外与毫米波学报》2022年第4期756-761,共6页Journal of Infrared and Millimeter Waves

基　　金：陕西省重点研发计划(2020ZDLGY07-11);国家自然科学基金(61771391);深圳市科技创新委员会基础研究项目(JCYJ20180306171146740,JCYJ20170815162956949)。

摘　　要：提出一种适用于长波红外波段的二维偏振无关亚波长光栅结构。利用对称二维结构消除一维光栅的偏振相关性,增加光通量。提出光栅优化评价函数,将光栅结构参数优化转化为路径寻优问题。最后利用蚁群算法求解最优光栅结构参数。仿真结果表明,提出的二维多层结构在10∼13μm波段具有偏振无关、窄周期、窄带宽、低旁带的优点。提出的优化设计方法收敛速度快,优化后的光谱曲线横电波(TE)和横磁波(TM)偏振方向透射率均达到70%,带宽260 nm。A two-dimensional polarization-independent subwavelength grating structure suitable for long wave infrared band have been proposed.Symmetric two-dimensional structure is used to eliminate polarization dependence of one-di‐mensional grating and increase luminous flux.The evaluation function of grating optimization was proposed,and then the optimization of grating structure parameters was transformed into a path optimization problem.Finally,the ant colo‐ny algorithm was used to solve the optimal grating structure parameters.Simulation results show that the proposed two dimensional multilayer structure has the advantages of polarization independence,narrow grating period,narrow spec‐tral bandwidth and low side band in 10∼13μm band.The convergence speed of the proposed optimization design meth‐od is fast.The transmittance of the polarization direction of transverse electric(TE)and transverse magnetic(TM)reaches 70%,and the spectral bandwidth is 260 nm.

关 键 词：二维多层光栅 参量优化 蚁群优化 长波红外 

分 类 号：O433[机械工程—光学工程]