光栅对石墨烯太赫兹光学性质的影响  

The effect of grating on terahertz optical properties of graphene

作　　者：赵承祥 郑苗苗 ZHAO Chengxiang;ZHENG Miaomiao(College of Physics and Information Engi+ering,Shanxi Normal University,Taiyuan 030031,China)

机构地区：[1]山西师范大学物理与信息工程学院,太原030031

出　　处：《激光杂志》2022年第3期25-28,共4页Laser Journal

基　　金：国家自然科学基金项目(No.11604192);山西省高等学校科技创新项目(No.2020L0242);山西师范大学博士启动基金(No.0505/02070351)。

摘　　要：在不考虑等离激元诱导效应的情况下,利用玻尔兹曼平衡方程方法从理论上研究了金属光栅结构对石墨烯光电导率的直接影响。研究发现由于光栅对入射光的动量补偿作用,光栅对石墨烯的带内光电导率产生了显著的影响,使得在石墨烯的太赫兹吸收窗口区域出现光电导率峰,并且该光电导率峰可由光栅周期、电子浓度以及温度来调控。该研究有助于深入理解光栅结构对光电材料的影响,并表明光栅-石墨烯体系可以应用于可调谐的太赫兹光电器件,如太赫兹探测器。Without considering the effect of plasmon,the direct effect of metal grating structure on the optical conductivity of graphene was investigated theoretically by Boltzmann equilibrium equation method.It was found that the grating has a significant effect on the intra band optical conductivity of graphene due to the momentum compensation effect of the grating on the incident light.A peak of optical conductivity can be observed in the terahertz absorption window region of graphene,which can be tuned by the grating period,electron density and temperature.This study can help to get a in-depth understanding of the effect of grating on optoelectronic materials,and indicated that the grating-graphene system can be applied to tunable terahertz optoelectronic devices,such as terahertz detectors.

关 键 词：石墨烯 光栅 太赫兹 光电导率 

分 类 号：TN301.1[电子电信—物理电子学]