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<p>Bound states in the continuum (BICs) possess theoretically infinite quality factors (Q-factors) and robustness against system parameter variations, making them highly promising for applications in photonics, optical communication, biosensing, and photovoltaics. This study systematically investigates the modulation mechanisms of BICs in micro-nano polymorphic metasurfaces, explores their potential applications in polymorphic sensing materials. It is discovered that BICs can exist at both at-<i>Γ</i> and off-<i>Γ</i> points for appropriately sized polygons, with redshifted resonance spectral lines achieved by adjusting the spacing of symmetric micro-nano structures. Furtherly demonstrates in asymmetric bimodal metasurfaces, at-<i>Γ</i> BICs degrads into quasi BICs, while off-<i>Γ</i> BICs persist. Additionally, it is shown the number of layers and the unit size can effectively modulates the number and central wavelength of BICs. These findings provide new insights into flexible BIC modulation and optimization of related optical devices.</p>

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Tunable multiple bound states in the continuum via symmetry and layer modulation in metasurfaces

  • 期刊论文

  • 发表日期：

    2025年10月25日

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  • Zhaoyou Zeng,
  • Xin Guan,
  • Zeyang Chu,
  • Meidi Zhang,
  • Junwu Zhuo,
  • Jie Cui,
  • Man Gao,
  • Yue Shao,
  • Suxia Xie

摘要

Bound states in the continuum (BICs) possess theoretically infinite quality factors (Q-factors) and robustness against system parameter variations, making them highly promising for applications in photonics, optical communication, biosensing, and photovoltaics. This study systematically investigates the modulation mechanisms of BICs in micro-nano polymorphic metasurfaces, explores their potential applications in polymorphic sensing materials. It is discovered that BICs can exist at both at-Γ and off-Γ points for appropriately sized polygons, with redshifted resonance spectral lines achieved by adjusting the spacing of symmetric micro-nano structures. Furtherly demonstrates in asymmetric bimodal metasurfaces, at-Γ BICs degrads into quasi BICs, while off-Γ BICs persist. Additionally, it is shown the number of layers and the unit size can effectively modulates the number and central wavelength of BICs. These findings provide new insights into flexible BIC modulation and optimization of related optical devices.