Perfect absorption in a monolayer graphene at the near-infrared using a compound waveguide grating by robust critical coupling

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英文篇名：Perfect absorption in a monolayer graphene at the near-infrared using a compound waveguide grating by robust critical coupling 作者：胡劲华 ; 付佳 ; 刘秀红 ; 任丹萍 ; 赵继军 ; 黄永清 英文作者：Jinhua Hu;Jia Fu;Xiuhong Liu;Danping Ren;Jijun Zhao;Yongqing Huang;School of Information & Electrical Engineering, Hebei University of Engineering;School of Mathematics & Physics, Hebei University of Engineering;State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications; 中文刊名：GXKB 英文刊名：中国光学快报(英文版) 机构：School of Information & Electrical Engineering, Hebei University of Engineering;School of Mathematics & Physics, Hebei University of Engineering;State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications; 出版日期：2019-01-25 出版单位：Chinese Optics Letters 年：2019 期：v.17 基金：supported in part by the National Key Research and Development Program of China(No.2018YFF0301004);; the Scientific Research Projects of the Department of Education of Hebei Province(No.QN2016090);; the National Natural Science Foundation of Hebei Province(Nos.F2017402068,F2018402198,and A2015402035);; the Research Program for Top-notch Young Talents in Higher Education Institutions of Hebei Province(No.BJ2017037);; the Research and Development Program for Science and Technology of Handan(No.1621203037) 语种：英文; 页：GXKB201901001 页数：4 CN：01 ISSN：31-1890/O4 分类号：5-8

摘要

We present a perfect graphene absorber with a compound waveguide grating at the near-infrared. The analytical approach is mainly based on the coupled leaky mode theory, which turns the design of the absorber to finding out the required leaky modes supported by the grating structure. Perfect absorption occurs only when the radiative loss of the leaky mode matches the intrinsic absorption loss, which is also named the critical coupling condition.Furthermore, we also demonstrate that the critical coupling of the system can be robustly controlled, and the perfect absorption wavelength can be easily tuned by adjusting the parameters of the compound waveguide grating.
        We present a perfect graphene absorber with a compound waveguide grating at the near-infrared. The analytical approach is mainly based on the coupled leaky mode theory, which turns the design of the absorber to finding out the required leaky modes supported by the grating structure. Perfect absorption occurs only when the radiative loss of the leaky mode matches the intrinsic absorption loss, which is also named the critical coupling condition.Furthermore, we also demonstrate that the critical coupling of the system can be robustly controlled, and the perfect absorption wavelength can be easily tuned by adjusting the parameters of the compound waveguide grating.

引文

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