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<p>In this paper, a dual-mode asymmetric terahertz (THz) metasurface with quadruple-function dynamic switching in full space assisted by graphene and vanadium dioxide (VO<sub>2</sub>) is proposed. For THz waves incident along the + <i>z</i>-axis, the metasurface operates in absorption mode. By modulating the phase transition of VO<sub>2</sub> between metallic and insulating states, dynamic switching between broadband and narrowband absorption functionalities is enabled. For THz waves incident along the -<i>z</i>-axis, the metasurface operates in polarization conversion mode. By toggling VO<sub>2</sub> between its metallic and insulating states, the metasurface can switch between linear-to-linear polarization conversion (LTL-PC) and linear-to-circular polarization conversion (LTC-PC). Compared with recently reported designs, the proposed metasurface exhibits enhanced multifunctional integration, agile mode-switching, dynamic tunability, and full-space adaptability.</p>

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Dual-mode asymmetric terahertz metasurface with quadruple-function dynamic switching capabilities in full space

  • 期刊论文

  • 发表日期：

    2026年3月22日

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  • Xingtong Zhou,
  • You Li,
  • Jieying Zhang,
  • Xunjun He,
  • Ying Zhang

摘要

In this paper, a dual-mode asymmetric terahertz (THz) metasurface with quadruple-function dynamic switching in full space assisted by graphene and vanadium dioxide (VO2) is proposed. For THz waves incident along the + z-axis, the metasurface operates in absorption mode. By modulating the phase transition of VO2 between metallic and insulating states, dynamic switching between broadband and narrowband absorption functionalities is enabled. For THz waves incident along the -z-axis, the metasurface operates in polarization conversion mode. By toggling VO2 between its metallic and insulating states, the metasurface can switch between linear-to-linear polarization conversion (LTL-PC) and linear-to-circular polarization conversion (LTC-PC). Compared with recently reported designs, the proposed metasurface exhibits enhanced multifunctional integration, agile mode-switching, dynamic tunability, and full-space adaptability.