弱手性超表面中的超常极化旋转  

Extraordinary strong opticalrotation in weak chiralmetasurface

作　　者：崔建华[1,2] 马晓亮 蒲明博[1] 郭迎辉[1] 罗先刚[1] Cui Jianhua;Ma Xiaoliang;Pu Mingbo;Guo Yinghui;Luo Xiangang(State Key Laboratory of Optical Technologies on Nano-Fabrication and Micro-Engineering,Institute of Optics and Electronics,Chinese Academy of Science,Chengdu,Sichuan 610209,China;University of Chinese Academy of Science,Beijing 100049,China)

机构地区：[1]中国科学院光电技术研究所微细加工光学技术国家重点实验室,四川成都610209 [2]中国科学院大学,北京100049

出　　处：《光电工程》2020年第7期10-17,共8页Opto-Electronic Engineering

基　　金：国家自然科学基金资助项目(61622508,61622509)。

摘　　要：本文介绍了一种能够产生超强旋光性的弱手性极薄(λ/10)亚波长结构的超表面。该超表面的单元结构由介质层以及设置在介质层上下表面的两层椭圆金属贴片组成,两层椭圆金属贴片之间存在一个扭转角的关系。当扭转角为80°时,超表面在谐振频点11.89 GHz处能将入射线偏振电磁波转换为交叉极化透射波,其透过率超过94%。这种超表面重量轻、体积小,为极化旋转提供了一种可靠的方法。若将其拓展到光波波段,该超表面在弱手性分子的生物学检测中有潜在的应用。A preternatural and extremely thin metasurface with weak asymmetric unit structure is presented here to demonstrate extraordinary strong chirality.The unit cell of metasurface is composed of a double layer of elliptical metal patches with a certain twisted angle and a medium sandwiched between them.When the twisted angle equals to 80°,optical activity can be realized in this metasurface.At the resonant frequency 11.89 GHz,the incident linearly polarized wave is converted into its cross-polarization wave with the transmittance rate higher than 94%.The light weight and miniaturization of this metasurface provide a reliable approach for polarization manipulation.If extended to light waveband,the metasurface may have potentials in biological applications such as detection of weak chiral molecules,etc.

关 键 词：超表面 手性 超常 旋光性 

分 类 号：TB33[一般工业技术—材料科学与工程]