基于石墨烯电光特性的多功能超材料吸波体设计  

Design of multifunctional metamaterial absorber based on electro-optic properties of graphene

作　　者：王越 王丽[1] 董连和[1] 刘顺瑞 王君[1] 冷雁冰[1] 孙艳军[1] WANG Yue, WANG Li, DONG LianHe, LIU ShunRui, WANG Jun, LENG YanBing , SUN YanJun(School of Photo-electronic Engineering, Changchun University of Science and Technology, Changchun 130022, Chin)

机构地区：[1]长春理工大学光电工程学院,长春130022

出　　处：《中国科学：物理学、力学、天文学》2018年第4期66-72,共7页Scientia Sinica Physica,Mechanica & Astronomica

基　　金：国家自然科学基金(编号:11474037)资助项目

摘　　要：本文利用石墨烯的电光特性设计了一种可见光透明且振幅可调的超材料吸波体.首先通过商业软件CST Microwave Studio 2011模拟了石墨烯费米能级为0.5 eV时,介质层厚度对吸波体吸收特性的影响,仿真结果表明,介质层厚度从1.3 mm增加到1.6 mm,吸波体的中心频率从84 GHz红移到67 GHz,且吸收率几乎不变;其次模拟了介质层厚度为1.5 mm时,石墨烯费米能级对吸波体吸收特性的影响,仿真结果表明,通过改变电压来改变石墨烯的费米能级可以使吸波体实现振幅可调的功能,其调制深度可达47.9%左右,并且通过仿真证实了该吸波体还具有极化不敏感及入射角度不敏感的特性;最后对该吸波体表面电流分布及内部的空间电场进行仿真与分析,并阐述了其电磁吸波及振幅可调的机理.该超材料吸波体不仅具有超高的电磁波吸收率,并且具有可见光透明和振幅可调的功能,在隐身、探测和通信等领域具有潜在的应用价值.Recently, metamaterial absorber has attracted considerable attention because of a broad range potential application to electromagnetic stealth, electromagnetic detectors, and electromagnetic communication. In this paper, a multifunctional metamaterial absorber based on the electro-optic properties of grapheme is presented. The absorber was consisted of graphene microstructure, PDMS media layer and a single layer ITO film. These components made the absorber is optically transparent because all of the components are optically transparent. At first, we optimized the structural parameters to get a satisfactory absorption rate by the finite element method when the Fermi level of graphene was 0.5 eV. In this process, we found the resonance frequency of the absorber will have a red shift phenomenon with the increase of the dielectric layer thickness. When the dielectric layer thickness increases from 1.3 to 1.6 mm, the resonance frequency of the absorber is red-shifted from 84 to 67 GHz. And the absorption rate was almost unchanged in this process. Secondly, we mainly simulated the influence of Fermi level of graphene on the absorption characteristics of absorber by the same method when the dielectric layer thickness was 1.5 mm. The research indicated that the absorber possessed a amplitude tunable characteristic resulting from the change of grapheme Fermi level by altering the applied voltage. When the graphene Fermi level increased from 0 to 0.5 e V, the absorption rate of the absorber would from 50% to 97%. And the simulation results showed that the bandwidth achieves 8.2 GHz for the absorption beyond 90%, and the maximum absorption is up to 97% when the graphene Fermi level is 0.5 eV and the dielectric layer thickness was 1.5 mm. In addition, we proved the absorber is insensitive to the polarization and the wide-angle. The absorption rate would not change when we changed the polarization direction or changed the incident angle within 45°. Finally, we studied the distribution of the surface current and the electric

关 键 词：超材料吸波体 石墨烯 光学透明 振幅可调 

分 类 号：TB34[一般工业技术—材料科学与工程]