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Ultrahigh-Q and Polarization-Independent Terahertz Metamaterial Perfect Absorber

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Abstract

Ensuring a good trade-off between high-quality factor (Q-factor) and polarization independency is a key challenge for designing practicable terahertz metamaterial devices. We propose a symmetric composite aluminum-structured metamaterial absorber to achieve high Q-factor beyond 80 and near-unity absorbance of arbitrary polarization waves in the terahertz regime. Ultrahigh Q-factor reaches 84, and polarization-independent absorption is as high as 99% for resonant frequency tuning from 7.58 to 8.97 THz, covering 14% of the standard THz gap. The geometric effect of the symmetric sublattice on resonant frequency tuning is analyzed. The large Q-factor and strong absorption by oblique incidence is discussed. Designed high-Q metamaterial perfect absorber has various applications, including terahertz hyperspectral imaging, filtering, and sensing.

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Funding

This work was supported by the National Natural Science Foundation of China (NSFC) (1167040679, 50902034).

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Authors and Affiliations

  1. Department of Physics, Harbin Institute of Technology, Harbin, 150001, China

    Jing Wang, Chengpeng Hu, Qi Tian, Wenxiu Yu, Hao Tian, Jianlong Liu & Zhongxiang Zhou

  2. Key Lab of In-fiber Integrated Optics of Ministry of Education, Harbin Engineering University, Harbin, 150009, China

    Li Li

Authors
  1. Jing Wang
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  2. Chengpeng Hu
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  3. Qi Tian
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  4. Wenxiu Yu
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  5. Hao Tian
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  6. Li Li
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  7. Jianlong Liu
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  8. Zhongxiang Zhou
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Correspondence to Chengpeng Hu.

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Wang, J., Hu, C., Tian, Q. et al. Ultrahigh-Q and Polarization-Independent Terahertz Metamaterial Perfect Absorber. Plasmonics 15, 1943–1947 (2020). https://doi.org/10.1007/s11468-020-01221-8

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  • DOI: https://doi.org/10.1007/s11468-020-01221-8

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