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Dual-regulated broadband terahertz absorber based on vanadium dioxide and graphene

机译:基于二氧化钒和石墨烯的双调节宽带太赫兹吸收器

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摘要

A tunable broadband terahertz (THz) absorber based on vanadium dioxide (VO2) and graphene is proposed. The absorber, consisting of the VO2 square loop, polymethacrylimide (PMI) dielectric layer, and a layer of unpatterned graphene, can achieve absorption over 90% from 1.04 THz to 5.51 THz and relative bandwidth of up to 136.5% under normal incidence. Its absorption bandwidth and absorption peak can be adjusted by changing the conductivity of VO2 or the chemical potential of graphene. The physical mechanism of the absorber is analyzed in detail by the use of the impedance matching theory and the electric field distributions of the VO2 layer and graphene layer. The proposed absorber, with polarization insensitivity and incidence angle of 30 degrees for both TE andTMpolarizations, may have potential applications in tunable sensors, modulators, and imaging. (C) 2021 Optical Society of America
机译:提出了一种基于二氧化钒(VO2)和石墨烯的可调谐宽带太赫兹吸收材料。该吸收体由VO2方环、聚甲基丙烯酰亚胺(PMI)介电层和一层无图案石墨烯组成,在正常入射下可实现90%以上的吸收,从1.04太赫兹到5.51太赫兹,相对带宽高达136.5%。它的吸收带宽和吸收峰可以通过改变VO2的电导率或石墨烯的化学势来调节。利用阻抗匹配理论和VO2层和石墨烯层的电场分布,详细分析了吸收体的物理机制。所提出的吸收体对TE和TM偏振都具有偏振不敏感度和30度的入射角,可能在可调谐传感器、调制器和成像中有潜在的应用。(2021)美国光学学会

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  • 来源
    《Applied optics》 |2021年第16期|共6页
  • 作者单位

    Sichuan Univ Coll Elect &

    Informat Engn Chengdu 610064 Sichuan Peoples R China;

    Sichuan Univ Coll Elect &

    Informat Engn Chengdu 610064 Sichuan Peoples R China;

    Sichuan Univ Coll Elect &

    Informat Engn Chengdu 610064 Sichuan Peoples R China;

    Sichuan Univ Coll Elect &

    Informat Engn Chengdu 610064 Sichuan Peoples R China;

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  • 正文语种 eng
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