三层石墨烯组成的太赫兹可调宽频带超材料吸收器  

Study on Terahertz Tunable Broadband Metamaterial Absorber Composed of Three-Layer Graphene Patterns

作　　者：刘文 田晋平[1] 杨荣草[1] LIU Wen;TIAN Jinping;YANG Rongcao(College 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》2022年第5期384-390,共7页Journal of Test and Measurement Technology

基　　金：国家自然科学基金资助项目(61775126);集成光电子学国家重点实验室开放课题(IOSKL2019KF16)。

摘　　要：设计了一种基于石墨烯的太赫兹宽带可调谐超材料吸收器,3层具有相同形状和尺寸的石墨烯谐振单元嵌入到介质材料TOPAS中,底部用金阻止透射.数值模拟研究结果表明,吸收率超过90%的频带宽度可以达到4.64 THz,在5 THz和7.7 THz附近,吸收率接近100%.通过调节石墨烯的化学势和弛豫时间,该吸收器的吸收强度和吸收带宽可以在一定程度上实现动态调节.由于结构的对称性,该吸收器具有极化不敏感的特性和宽角度入射的特性.鉴于此,本文所设计的超材料吸收器有望在THz电磁隐身、调制、成像、开关、反射等领域展现出潜在的应用价值.A graphene-based broadband tunable Tera Hertz(THz) metamaterial absorber is designed, of which three layers of graphene resonant cells with the same shape and size are embedded into the dielectric medium of TOPAS and a back layer of thick-enough gold is applied to block the transmission. Research results show that absorption bandwidth with the absorption rate of over 90% can reach 4.64 THz, and at about 5 THz and 7.7 THz, the absorption rate is nearly 100%. By tuning the chemical potential and relaxation time of graphene, dynamical tunability of absorption strength and absorption bandwidth can be achieved in a certain degree. Due to the symmetry of the proposed absorber structure, it possesses the characteristics of polarization-insensitive and wide-angle incidence. In terms of these optimal properties, the proposed metamaterial absorber may have potential applications in the fields of THz electromagnetic stealth, modulating, imaging, switching, reflection, and so on.

关 键 词：太赫兹 石墨烯 宽带 超材料吸收器 

分 类 号：TN015[电子电信—物理电子学]