基于MIM结构等离子体波导定向耦合器  

Directional Couplers Based on MIM Plasmonic Waveguide Stuctures

作　　者：王继成[1] 蒋亚兰 王跃科[1] 刘诚[1] 唐宝杰 孙林[1] 

机构地区：[1]江南大学理学院,江苏无锡214122

出　　处：《中国激光》2015年第2期320-326,共7页Chinese Journal of Lasers

基　　金：国家自然科学基金(11347196;11347214;61178032);江苏省自然科学基金(BK2012548;BK20140167;BK20130162);中央高校自主科研基金(JUSRP211A20);国家大学生创新训练计划项目(201410295027)

摘　　要：理论设计了带有扇环共振微腔的弯曲金属-介质-金属(MIM)波导结构,利用共振微腔结构控制表面等离子体波在扇环直角顶点处的定向传播。通过有限时域差分(FDTD)法计算带有扇环微腔结构的直波导透射率与波长关系,并计算扇环微腔结构与传播波导间的间隔对光学性质的影响,发现此微腔波导结构具有较高的透射率,可以在特定波长位置实现滤波效果。基于上述理论设计三路、四路弯曲波导结构,实现表面等离子体波在弯曲波导处的分束、全反射等定向传输特性。该结构具有极强的光束缚效应,在纳米尺度对光进行传输,解决了光信号的反射、传输问题,在光集成、光通讯、光信息处理等方面有较好的应用前景。The metal-insulator-metal （MIM） based bending waveguide structures with a quadrant ring resonator （QRR） are presented in theory. Those structures can control the directional propagation of plasmonic waves in waveguide cross junctions. The transmission of various wavelengths in straight waveguide with a quadrant ring resonator based on finite-different time-domain （FDTD） method is studied, and optical properties of the barrier thickness between quadrant ring resonator and communication waveguides are also studied. The simulation results demonstrate that the waveguide structure can achieve higher transmission, and achieve the filtering effects at the specific wavelength positions. In addition, three and four waveguide branches structures are proposed. The structures can obtain the effects of directional transmission of surface plasma wave in the waveguide bends, such as beam splitting, total reflection. The structures have the effects of strong beam binding, nanometer-scale transmission, and can solve the problem of signal transmission and reflection. Those design structures have an important application prospects in optical integration, communication, information processing.

关 键 词：光学器件 表面等离子体金属-介质-金属结构 光波导 光学谐振腔 

分 类 号：TN256[电子电信—物理电子学]