摘要
提出一种基于石墨烯的双波段太赫兹超材料吸收体,它由金属-电介质-石墨烯3层超材料结构单元在水平方向上进行周期性拓展而成。仿真结果显示,其在太赫兹波段6.62THz和9.36 THz分别产生99.9%和98.9%的高吸收率;通过改变石墨烯的费米能级,可以灵活地控制吸收体的谐振频率和吸收强度,而吸收体的吸收强度也可以利用石墨烯的弛豫时间进行单独控制。另外,研究了吸收体中间介质层厚度和介质损耗对吸收率的影响,这为吸收体初始加工工艺参数的确定提供了依据。研究结果表明,提出的基于石墨烯的太赫兹超材料吸收体结构简单,易于加工,可通过偏置电压或者化学掺杂,简单地实现吸收体的可调谐性,为双波段高吸收率太赫兹超材料吸收体的设计提供了重要参考。
A graphene-based dual-band terahertz metamaterial absorber is proposed,and it is comprised of three-layer metamaterial structural unit by periodical expansion in the horizontal direction.The simulation results show that the absorber produces 99.9%and 98.9%high absorptivity in the terahertz bands of 6.62 THz and 9.36 THz respectively.By changing the Fermi level of graphene,the resonant frequency and absorption intensity of the absorber can be flexibly controlled.The absorption intensity of the absorber can also be individually controlled by the relaxation time of the graphene.In addition,the influence of the thickness and loss of the intermediate dielectric layer of the metamaterial absorber on the absorptivity was studied,which is conducive to determine the initial processing parameters of the absorber.The study results show that the proposed graphene-based terahertz metamaterial absorber has a simple structure and is easy to process,moreover,it can realize the tuning of the metamaterial absorber by biased voltages or chemical doping.The metamaterial absorber proposed in this paper provides an important reference for the design of dual-band absorbers with high absorptivity in terahertz band.
作者
宋建勋
徐永钊
凌东雄
魏东山
SONG Jianxun;XU Yongzhao;LING Dongxiong;WEI Dongshan(School of Electrical Engineering&Intelligentization,Dongguan University of Technology,Dongguan Guangdong 523808,China)
出处
《太赫兹科学与电子信息学报》
北大核心
2019年第6期933-938,共6页
Journal of Terahertz Science and Electronic Information Technology
基金
国家自然科学基金资助项目(61771138)
东莞市社会科技发展资助项目(2015108101006)
关键词
太赫兹
石墨烯
超材料
吸收体
terahertz
graphene
metamaterial
absorber
