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连续域束缚态最初是在量子力学中被发现的，它是一种可保持局域化的波动现象。这种效应已在各种材料系统中得到广泛研究，包括压电材料、石墨烯和光子晶体。在这项工作中，我们提出了一种由中断的环形槽组成的四重旋转对称硅超表面。通过同时打破晶胞的面内反转对称性，我们实现了具有高品质因子和显著手性的准连续域束缚态。通过对动量空间中拓扑荷的研究，我们揭示了由超表面的内部共振机制产生的准连续域束缚态的独特拓扑特征。在合适的对称破坏下，具有平面内对称破坏的四重旋转对称超表面表现出-0.93的强圆二色性，并且它显示出了在对称破坏较大时的强圆二色性。这项工作中的发现对手性生物传感器和低阈值激光器等潜在应用有着广阔的前景。Bound states in the continuum (BIC) were initially observed in quantum mechanics as a phenomenon capable of maintaining localized wave behavior. This effect has been extensively studied across various material systems, including piezoelectric materials, graphene, and photonic crystals. Recently, the BIC mode has employed to achieve strong optical chirality in metamaterials with symmetry breaking. In this work, we propose a silicon metasurface with an interrupted ring groove, which has a fourfold rotationally symmetry. By breaking the in-plane inversion symmetry of the unit cell, we achieve quasi-BICs with the high quality factor and conspicuous chirality. Moreover, with the analysis of topological charges in momentum space, we reveal that the unique topological characteristics of quasi-BIC was generated by the internal resonance of metasurface. With an appropriate degree of symmetry breaking, our proposed symmetry-broken metasurface exhibits a strong circular dichroism with value of -0.93, which demonstrates the quasi-BIC mode enables a strong chiral selectivity. For chiral sensing applications, the chiral metasurface exhibits a spectral resolution of approximately 0.003. The findings presented in this work are of great promise for applications in chiral sensing, nonlinear chiral optics, low-threshold lasers, and other related fields.
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Keywords:
- bound state in the continuum /
- metasurface /
- chirality /
- circular dichroism
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