双层石墨烯手性超表面实现圆二色性及其动态调控研究  

Research on circular dichroism and dynamic control of bilayer graphene chiral metasurfaces

作　　者：宋效先 张宇[2] 郭学文 张海婷 张晶晶[2] 戴子杰 梁莹 姚建铨[1,2] SONG Xiaoxian;ZHANG Yu;GUO Xuewen;ZHANG Haiting;ZHANG Jingjing;DAI Zijie;LIANG Ying;YAO Jianquan(College of Precision Instruments and Opto-electronics Engineering,Tianjin University,Tianjin 300072,China;School of Mechanical and Engineering,Jiangsu University,Zhenjiang Jiangsu 212013,China)

机构地区：[1]天津大学精密仪器与光电子工程学院,天津300072 [2]江苏大学机械工程学院,江苏镇江212013

出　　处：《光通信技术》2024年第5期108-112,共5页Optical Communication Technology

基　　金：江苏省自然科学基金项目(批准号:BK20220519)资助;江苏省高校面上项目(批准号:22KJB140002)资助;光电信息技术教育部重点实验室(天津大学)项目(批准号:2022KFKT010)资助;河北省先进激光技术与装备重点实验室开放课题(批准号:HBKL-ALTE2024006)资助。

摘　　要：针对石墨烯手性超表面的研究主要集中在中红外波段,而在太赫兹波段的器件研究相对较少,以及石墨烯非本征结构产生的圆二色性不足的问题,根据石墨烯的特性设计了一种双层石墨烯手性超表面结构。该结构的上下两层石墨烯图案存在一定的夹角,通过调整这个夹角大小和中间层二氧化硅的厚度,研究了超表面结构的圆二色性。此外,还通过改变石墨烯的费米能级和弛豫时间,分析了超表面结构的动态调谐能力。仿真结果表明:该超表面结构能够在太赫兹频段实现圆二色性,并且具备动态调谐的能力。This paper focuses on the research of graphene chiral metasurfaces,which is mainly concentrated in the mid-infrared band,while there are relatively few studies on devices in the terahertz band,and the problem of insufficient circular dichroism generated by the non-intrinsic structure of graphene.Based on the properties of graphene,a double-layer graphene chiral metasurface structure is designed.There is a certain angle between the upper and lower graphene patterns of the structure.By adjusting the size of this angle and the thickness of the intermediate silicon dioxide layer,the circular dichroism of the metasurface structure is studied.In addition,the dynamic tuning ability of the metasurface structure is analyzed by changing the Fermi level and relaxation time of graphene.The simulation results show that the metasurface structure can achieve circular dichroism in the terahertz frequency band and has the ability of dynamic tuning.

关 键 词：超表面 石墨烯 太赫兹 圆二色性 费米能级 弛豫时间 

分 类 号：O436[机械工程—光学工程] TN929[理学—光学]