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Circular/linear dichroism and anisotropy based on tunable terahertz metasurfaces

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Abstract

We propose a chiral metasurface with tunable circular/linear dichroism based on graphene. When a circularly polarized (CP) wave is incident, the metasurface can achieve circular dichroism at two frequencies. Under the incidence of linearly polarized (LP) wave, the metasurface exhibits linear dichroism. At a frequency of 1.89 THz, the designed metasurface has an absorption rate of over 99% for right-handed circularly polarized (RCP) wave, and 11% for left-handed circularly polarized (LCP) wave. The circular dichroism equals 0.88. At 3.0 THz, while the absorptance of the metasurface for LCP and for RCP waves is 97% and 17%, respectively. The circular dichroism is 0.80. At 0.76 THz, and the absorption rate of the metasurface for x-polarized and y-polarized waves is 0.95 and 0.22, respectively. The linear dichroism is 0.73. The near-field imaging is realized by using the differential characteristics of the circular dichroism metasurface. In addition, imaging resolution, linear/Circular dichroism, and single-/dual-frequency terahertz absorption can be effectively adjusted by changing the Fermi level of graphene. This structure has good application prospects in tunable imaging and tunable dichroism.

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Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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Funding

Funding was provided by National Natural Science Foundation of China (62271460) and Zhejiang Key R & D Project of China (2021C03153, 2022C03166).

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Authors and Affiliations

  1. Centre for THz Research, China Jiliang University, Hangzhou, 310018, China

    Rou-Lan Wu & Jiu-Sheng Li

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  1. Rou-Lan Wu
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  2. Jiu-Sheng Li
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R. Wu prepared Figures 1-8, and J. Li wrote the main manuscript text. All authors reviewed the manuscript.

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Correspondence to Jiu-Sheng Li.

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Wu, RL., Li, JS. Circular/linear dichroism and anisotropy based on tunable terahertz metasurfaces. J Comput Electron (2024). https://doi.org/10.1007/s10825-024-02142-z

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