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<p>Active chiral metasurfaces are highly required for the applications in stereochemistry, molecular biology and polarization optics. In this paper, the giant and large-range multistate switchable circular dichroism (CD) is realized in a Ge<sub>2</sub>Sb<sub>2</sub>Te<sub>5</sub> (GST) based intrinsic chiral metasurface. The CD magnitude could be continually tuned from near zero to near unity by controlling the crystalline degree of GST. The near-unity CD originates from the polarization selective excitations of electric quadrupole (EQ), anapole and magnetic dipole (MD) resonances, which is simultaneously demonstrated by quantitative multipole decomposition and electromagnetic field distribution analysis. The GST-based intrinsic chiral metasurfaces with the capability of dynamic polarization control have great potentials in the next generation polarization nanodevices.</p>

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The giant and multistate switchable circular dichroism in a Ge2Sb2Te5-based intrinsic chiral metasurface

  • 期刊论文

  • 发表日期：

    2025年7月25日

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  • Huilin Mo,
  • Xin Li,
  • Jinrui Lin,
  • Huan Jiang,
  • Ping Tang,
  • Ying Cui

摘要

Active chiral metasurfaces are highly required for the applications in stereochemistry, molecular biology and polarization optics. In this paper, the giant and large-range multistate switchable circular dichroism (CD) is realized in a Ge2Sb2Te5 (GST) based intrinsic chiral metasurface. The CD magnitude could be continually tuned from near zero to near unity by controlling the crystalline degree of GST. The near-unity CD originates from the polarization selective excitations of electric quadrupole (EQ), anapole and magnetic dipole (MD) resonances, which is simultaneously demonstrated by quantitative multipole decomposition and electromagnetic field distribution analysis. The GST-based intrinsic chiral metasurfaces with the capability of dynamic polarization control have great potentials in the next generation polarization nanodevices.