基于石墨烯的太赫兹可调谐宽带超材料吸收器  

Graphene-Based Terahertz Tunable Broadband Metamaterial Absorber

作　　者：袁晨 田晋平[1] 杨荣草[1] YUAN Chen;TIAN Jinping;YANG Rongcao(School of Physics and Electronic Engineering, Shanxi University, Taiyuan 030006, China)

机构地区：[1]山西大学物理电子工程学院,山西太原030006

出　　处：《测试技术学报》2020年第3期265-271,共7页Journal of Test and Measurement Technology

基　　金：国家自然科学基金资助项目(61775126);山西省自然科学基金资助项目(201601D011038)。

摘　　要：本文提出了一种太赫兹可调谐宽频段完美超材料吸收器,该吸收器由开缝金属图案层-石墨烯-聚酰亚胺介质-金属底板4层构成.通过调节石墨烯的费米能级,该结构可实现动态调谐带宽吸收特性.仿真研究发现,随着石墨烯费米能级由0.1 eV变为0.5 eV,吸收率高于90%的吸收带宽由1.93 THz^3.18 THz变为2.78~3.90 THz,低频移动范围为0.85 THz,高频移动范围为0.72 THz.而且,该吸收器具有偏振角和入射角不敏感的特性.本文提出的吸收器结构简单,在检测器、传感器、滤波器等太赫兹器件方面有潜在的应用.This paper proposes a terahertz tunable broadband perfect metamaterial absorber,which is composed of four layers:a slotted metal pattern,graphene sheet,polyimide dielectric spacer and metal plate.The proposed structure can realize the dynamically tunable broadband absorption by adjusting the Fermi levels of graphene.It is found by simulation that as the Fermi level of graphene changes from 0.1 eV to 0.5 eV,the absorption bandwidth of higher than 90%absorptivity will change from 1.93~3.18 THz to 2.78~3.90 THz,resulting in a low frequency shift 0.85 THz and a high frequency shift 0.72 THz,respectively.Moreover,the absorber possesses the characteristics of polarization-insensitive and wide incident angle.The simple absorber proposed in this paper has potential applications in terahertz devices such as detectors,sensors and filters.

关 键 词：太赫兹 宽带 可调谐 极化不敏感 吸收器 

分 类 号：TN015[电子电信—物理电子学]