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<p>In this work, we design and numerically investigate a chiral metasurface based on two-layer distorted silicon resonators on the silicon dioxide substrate. This distorted metasurface can support a chiral quasi-bound state in the continuum (quasi-BIC) with an ultrahigh Q-factor (exceeding 10<sup>5</sup>) and strong circular dichroism (CD = 0.887) by breaking the in-plane inversion symmetry. The sharply chiral quasi-BIC realized in this metasurface can generate high local field enhancement and be used in strong CD nonlinear responses. Numerical results show that the third-harmonic generation (THG) efficiency of 9.24 × 10<sup>−5</sup> for a peak amplitude of the pump of 1.55 × 10<sup>8</sup> V/m can be achieved, and the THG-CD reaches up to 0.94. Meanwhile, we have theoretically demonstrated that this metasurface shows potential for applications in chiral sensing with high sensitivities.</p>

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Chiral Quasi-Bound State in the Continuum in Dielectric Metasurface for Third Harmonic Generation with Strong Circular Dichroism

  • 期刊论文

  • 发表日期：

    2025年6月5日

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  • Wudeng Wang,
  • Yingjie Ju,
  • Zhaojun Han,
  • Jiaheng Liu,
  • Yujie Zhang

摘要

In this work, we design and numerically investigate a chiral metasurface based on two-layer distorted silicon resonators on the silicon dioxide substrate. This distorted metasurface can support a chiral quasi-bound state in the continuum (quasi-BIC) with an ultrahigh Q-factor (exceeding 105) and strong circular dichroism (CD = 0.887) by breaking the in-plane inversion symmetry. The sharply chiral quasi-BIC realized in this metasurface can generate high local field enhancement and be used in strong CD nonlinear responses. Numerical results show that the third-harmonic generation (THG) efficiency of 9.24 × 10−5 for a peak amplitude of the pump of 1.55 × 108 V/m can be achieved, and the THG-CD reaches up to 0.94. Meanwhile, we have theoretically demonstrated that this metasurface shows potential for applications in chiral sensing with high sensitivities.