基于表面等离子体的角动量探测器  

Angular Momentum Detector Based on Surface Plasmons

作　　者：邱鹏 胡征达 孔艳[1] 蒋志龙 刘诚[1] 王绶玙[1] QIU Peng;HU Zheng-da;KONG Yan;JIANG Zhi-long;LIU Cheng;WANG Shou-yu(School of Science,Jiangnan University,Wuxi,Jiangsu 214122,China)

机构地区：[1]江南大学理学院

出　　处：《光子学报》2019年第10期141-149,共9页Acta Photonica Sinica

基　　金：国家自然科学基金(Nos.61705092,U1730132);江苏省自然科学基金(Nos.BK20170194,BK20180598);中央高校基本科研业务费专项资金资助(No.JUSRP51721B)~~

摘　　要：为了精确辨别探测光的角动量,设计了一种基于表面等离子体的角动量探测器.该探测器体积小巧,结构简单,仅通过在一块金膜层上刻蚀设计好的纳米矩孔阵列就能实现对入射光角动量的探测.当入射光照射该探测器时,首先根据表面激发产生的表面等离子体波的耦合方向辨别入射光的偏振方向;之后通过测量出射端口的光强强度与耦合方向端口光强总强度之比,定量计算出-1到+1之间轨道角动量拓扑数的精确值.该微纳结构探测器可以精确识别入射光的角动量,为光学片上系统的设计与开发提供新思路.In order to accurately detect the angular momentum of light,an angular momentum detector based on surface plasmons was designed.The detector is small and simple,which can detect the incident light only by etching the designed nanoslit array on a gold film.When incident light illuminates the detector,the polarization of incident light can be distinguished according to the coupling direction of surface plasmons.Moreover,by measuring the light intensity of the outgoing port compared with the total intensity of the coupling direction port,the accurate topological charge of orbital angular momentum between-1 and+1 can be quantitatively calculated.The nano-structure detector can accurately identify the angular momentum of incident light,providing a new idea for the design and development of on-chip optical system.

关 键 词：轨道角动量 偏振 相位涡旋 表面等离子激元 微纳结构 纳米矩孔 

分 类 号：O436.1[机械工程—光学工程]