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<p>In this paper, we propose an all-dielectric chiral metasurface composed of phase-change material Ge<sub>2</sub>Sb<sub>2</sub>Te<sub>5</sub> (GST) square split-ring resonators (SRRs) with identical sizes but different orientations, sandwiched between magnesium fluoride (MgF<sub>2</sub>) dielectric layers. This metasurface exhibits strong chiral responses to both linearly and circularly polarized incident waves. Numerical simulations reveal that it operates in the near-infrared spectral range, achieving a maximum asymmetric transmission (AT) of 0.8 with a tuning range of 420&#xa0;nm under linearly polarized wave incidence, and a maximum circular dichroism (CD) of 0.81 with a tuning range of 275&#xa0;nm under circularly polarized wave incidence. Tunable characteristics induced by varied crystallization ratio have also been investigated. This study has significant implications for the research on tunable functional devices based on GST and potential applications in low-loss and multifunctional photonic devices.</p>

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All-dielectric tunable metasurface realizing dynamic chiroptical characteristics

  • 期刊论文

  • 发表日期：

    2026年3月4日

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  • Haoguang Jiang,
  • Zhuolin Shi,
  • Minhua Li,
  • Jianfeng Dong

摘要

In this paper, we propose an all-dielectric chiral metasurface composed of phase-change material Ge2Sb2Te5 (GST) square split-ring resonators (SRRs) with identical sizes but different orientations, sandwiched between magnesium fluoride (MgF2) dielectric layers. This metasurface exhibits strong chiral responses to both linearly and circularly polarized incident waves. Numerical simulations reveal that it operates in the near-infrared spectral range, achieving a maximum asymmetric transmission (AT) of 0.8 with a tuning range of 420 nm under linearly polarized wave incidence, and a maximum circular dichroism (CD) of 0.81 with a tuning range of 275 nm under circularly polarized wave incidence. Tunable characteristics induced by varied crystallization ratio have also been investigated. This study has significant implications for the research on tunable functional devices based on GST and potential applications in low-loss and multifunctional photonic devices.