双螺旋凹槽结构超表面检测偏振状态的研究  

Polarization State Detection Based on Double Helical Grooves Metasurface

作　　者：李松涛[1] 林俊哲 李文雯 常斯琦 任芝 LI Song-tao;LIN Jun-zhe;LI Wen-wen;CHANG Si-qi;REN Zhi(Department of Mathematics and Physics,North China Electric Power University,Baoding 071003,China)

机构地区：[1]华北电力大学数理系,河北保定071003

出　　处：《光学与光电技术》2022年第2期40-46,共7页Optics & Optoelectronic Technology

基　　金：河北省自然科学基金(A2019502044);教育部中央高校基本科研业务费(2020 MS138)资助项目。

摘　　要：偏振态信息与轨道角动量信息是光学信息的重要载体,也是光学信息处理的重要参量,在石英基底上设计了阿基米德双螺旋结构,利用有限元法计算了带有不同轨道角动量和偏振态信息的入射光照射到上述超构表面时,入射光与超表面耦合所产生的透射光呈现不同强度分布的图样,根据该图样,可检测入射光的偏振态信息。为检测入射光的轨道角动量,还提出了一种新的计算方法,针对不同轨道角动量的入射光与超表面耦合所产生的透射光场,计算出透射场强度中心偏移量,利用透射场强度中心的偏移表征入射光的轨道角动量,最后成功拟合出入射光轨道角动量与强度中心偏移二者的关系,实现了对入射光轨道角动量的检测。为检测入射光携带的信息提供了思路。Polarization information and orbital angular momentum information are important carriers of optical signals of optical information,as well as important parameters of optical information processing. In this paper,an Archimedes double helix structure is designed on a quartz substrate,and the finite element method is used to calculate the patterns of transmitted light intensity distribution generated by the coupling of the incident light and the metasurface,when the incident light has different orbital angular momentum and polarization information and irradiates the above-mentioned metasurface.According to this pattern,the polarization information of the incident light can be detected. In order to detect the orbital angular momentum of the incident light,a new calculation method is also proposed,which calculates the offset of the intensity center of the transmitted field generated by the coupling of the incident light and the metasurface and uses it to characterize the orbital angular momentum of the incident light. Finally,the relationship between the orbital angular momentum of incident light and the offset of the intensity center is fitted successfully,which realizes the detection of the orbital angular momentum of incident light. This research provides a new idea for detecting the information carried by incident light.

关 键 词：光学信息检测 超表面 阿基米德螺旋 偏振信息 轨道角动量 

分 类 号：O436[机械工程—光学工程]