基于方形腔耦合金属波导结构的全光等离子体开关  

All-Optical Plasmonic Switches Based on Square Cavity Coupled Metal Waveguide Structure

作　　者：肖功利[1] 窦婉滢 杨宏艳 徐俊林 杨秀华 张开富 杨寓婷 李海鸥[1] 傅涛 陈永和[1] 刘兴鹏 孙堂友 XIAO Gongli;DOU Wanying;YANG Hongyan;XU Junlin;YANG Xiuhua;ZHANG Kaifu;YANG Yuting;LI Haiou;FU Tao;CHEN Yonghe;LIU Xingpeng;SUN Tangyou(Guangxi Key Lab.of Precision Navigation Technol.and Application,Guilin University of Electronic Technol.,Guilin Guangxi 541004,CHN;School of Electronic Engin.and Automation,Guilin University of Electronic Technol.,Guilin 541004,CHN)

机构地区：[1]桂林电子科技大学广西精密导航技术与应用重点实验室,广西桂林541004 [2]桂林电子科技大学电子工程与自动化学院,广西桂林541004

出　　处：《半导体光电》2020年第1期93-98,共6页Semiconductor Optoelectronics

基　　金：国家自然科学基金项目(61465004,61765004,61874036,61764001);广西自然科学基金项目(2017GXNSFAA198164,2016GXNSFAA380006);桂林电子科技大学研究生教育创新计划资助项目(2017YJCX41,2019YCXS028);广西精密导航技术与应用重点实验室项目(DH201804,DH201703).

摘　　要：提出了一种新型的方形腔耦合金属波导结构,该结构由两个相互平行的矩形金属波导和一个内嵌可连通的方形谐振腔构成。利用方形谐振腔局域表面等离子体实现带阻滤波特性,并通过多路复用实现双端口全光等离子体开关。采用时域有限差分方法(FDTD)研究了方形腔的边长、折射率和谐振距离对强透射特性的影响。结果表明,基于方形腔耦合金属波导结构的光开关在工作中具有较好的阻带特性和透射特性,其最大透射率可达92%,最小阻带透射率达0.2%,工作波长范围为607~785nm。A novel square cavity coupled metal waveguide structure is proposed,which is composed of two mutually perpendicular rectangular metal waveguides and a square resonant cavity connecting rectangular waveguides.The band-rejection filtering characteristics are realized by the plasma local characteristics of the square resonator,and the dual-port all-optical plasma switch is realized by multiplexing.The effects of the length,refractive index and resonance distance of the square cavity on the strong transmission characteristics were studied by the finite difference time domain method.The results show that the optical switch based on the square cavity coupled metal waveguide structure has better stop-band characteristics and transmission characteristics,and its maximum transmittance is 92%,the minimum stopband transmittance is 0.2%,and the working range is 607~785 nm.

关 键 词：全光开关 时域有限差分方法 表面等离激元 方形腔 

分 类 号：TN256[电子电信—物理电子学]