We propose and experimentally demonstrate the operation of an electrically tunable, broadband coherent perfect absorption（CPA） at microwave frequencies by harnessing the CPA features of a graphene–electrolyte–graphene sandwich structure（GSS）. Using both a simplified lumped circuit model and full-wave numerical simulation, it is found that the microwave coherent absorptivity of the GSS can be tuned dynamically from nearly 50% to 100% by changing the Fermi level of the graphene. Strikingly, our simplified lumped circuit model agrees very well with the full-wave numerical model, offering valuable insight into the CPA operation of the device. The angle dependency of coherent absorption in the GSS is further investigated, making suggestions for achieving CPA at wide angles up to 80°. To show the validity and accuracy of our theory and numerical simulations, a GSS prototype is fabricated and measured in a C-band waveguide system. The reasonably good agreement between the experimental and the simulated results confirms that the tunable coherent absorption in GSS can be electrically controlled by changing the Fermi level of the graphene.
类型: 期刊论文
作者: JIN ZHANG,XINGZHAN WEI,MALIN PREMARATNE,WEIREN ZHU
来源: Photonics Research 2019年08期
年度: 2019
分类: 基础科学,工程科技Ⅰ辑
专业: 无机化工
单位: Department of Electronic Engineering,Shanghai Jiao Tong University,Chongqing Institute of Green and Intelligent Technology,Chinese Academy of Sciences,Advanced Computing and Simulation Laboratory (AχL),Department of Electrical and Computer Systems Engineering,Monash University
基金: National Natural Science Foundation of China(NSFC)(11574308,61701303),Natural Science Foundation of Shanghai(17PJ1404100,17ZR1414300)
分类号: TQ127.11
页码: 868-874
总页数: 7
文件大小: 853K
下载量: 15
本文来源: https://www.lunwen66.cn/article/6e76ba1d4881708c996f6a7e.html