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Dual-band and polarization-independent metamaterial terahertz narrowband absorber

机译：双频和偏振无关的超材料Terahertz窄带吸收器

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摘要

A dual-band terahertz metamaterial narrowband absorber is investigated based on a single simple windmill-shaped structure. The proposed metamaterial absorber achieves near-perfect absorption at 0.371 THz and 0.464 THz. The full width at half-maximum is 0.76% and 0.31% relative to absorption frequency. The multireflection interference theory is used for analyzing the absorption mechanism at low absorption frequency. The theoretical predictions of the decoupled model have excellent agreement with simulation results. By investigating the absorber's distribution of electric field and surface current density at high absorption frequency, the absorber's near-perfect absorption at the high absorption frequency originating from the magnetic resonance formed between the top metal structure and the bottom metal plane is explained. Besides, the absorber proposed is independent of the polarization angle. It is significant to various applications such as narrowband thermal radiation, photoelectric detection, biological sensing, and other fields. (C) 2021 Optical Society of America
机译：基于一个简单的风车形结构，研究了一种双频太赫兹超材料窄带吸收器。提出的超材料吸收体在0.371thz和0.464thz下实现了近乎完美的吸收。半最大值处的全宽相对于吸收频率分别为0.76%和0.31%。利用多反射干涉理论分析了低吸收频率下的吸收机理。解耦模型的理论预测与仿真结果吻合良好。通过研究吸收体在高吸收频率下的电场分布和表面电流密度，解释了吸收体在高吸收频率下的近完美吸收，该吸收源于顶部金属结构和底部金属平面之间形成的磁共振。此外，所提出的吸收体与偏振角无关。它在窄带热辐射、光电探测、生物传感等领域有着广泛的应用。（2021）美国光学学会

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  • 来源
    《Applied optics》 |2021年第8期|共7页
  • 作者

    Pan Wu; Shen Tao; Ma Yong; Zhang Zhen; Yang Huan; Wang Xi; Zhang Xuewen; Li Yi; Yang Lihao;

  • 作者单位

    Chongqing Univ Posts &

    Telecommun Coll Photoelect Engn Chongqing 400065 Peoples R China;

    Chongqing Univ Posts &

    Telecommun Coll Photoelect Engn Chongqing 400065 Peoples R China;

    Chongqing Univ Posts &

    Telecommun Coll Photoelect Engn Chongqing 400065 Peoples R China;

    Chongqing Univ Posts &

    Telecommun Coll Photoelect Engn Chongqing 400065 Peoples R China;

    Chongqing Univ Posts &

    Telecommun Coll Photoelect Engn Chongqing 400065 Peoples R China;

    Chongqing Univ Posts &

    Telecommun Coll Photoelect Engn Chongqing 400065 Peoples R China;

    Chongqing Univ Posts &

    Telecommun Coll Photoelect Engn Chongqing 400065 Peoples R China;

    Chongqing Univ Posts &

    Telecommun Coll Photoelect Engn Chongqing 400065 Peoples R China;

    Chongqing Univ Posts &

    Telecommun Coll Photoelect Engn Chongqing 400065 Peoples R China;

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