Design of a photo-excited broadband tunable terahertz absorber
Received:January 22, 2018  Revised:April 12, 2018  download
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Author NameAffiliationE-mail
Cheng Yongzhi School of Information Science and Engineering,Wuhan University of Science and Technology,Wuhan cyz0715@126.com 
Zuo Xuan School of Information Science and Engineering,Wuhan University of Science and Technology,Wuhan 1208039484@qq.com 
Huang Mulin School of Information Science and Engineering,Wuhan University of Science and Technology,Wuhan hml_q1@163.com 
Wang Tongnian School of Information Science and Engineering,Wuhan University of Science and Technology,Wuhan 514887025@qq.com 
Gong Rongzhou School of Optical and Electronic Information,Huazhong University of Science and Technology,Wuhan rzhgong@hust.edu.cn 
Abstract:A photo-excited and polarization insensitive broadband tunable terahertz metamaterial absorber (MMA) based on the photo-sensitive material of silicon (Si) was proposed. The unit-cell structure of this MMA is consisting of compact split-ring resonator structure filled with silicon, mediate medium layer and metal ground-plane. The working frequency and absorption intensity of this terahertz MMA could be effectively tuned, when the conductivity of silicon was changed by the varied incident optical intensity. The simulation results demonstrate that this MMA is dynamically adjusted in the frequency range from 0.852THz to 0.442THz when the conductivity of silicon increases from 1.0×103 S/m to the 5.0×105 S/m. In addition, its relative bandwidth is as much as 63.37% and absorption modulation depth is up to 60.22%. The further simulation indicates that MMA has characteristics of polarization insensitive and wide incident angle.
keywords:optical driving  tunable  terahertz absorber
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Copyright:《Journal of Infrared And Millimeter Waves》