Chiral Quasi-Bound States in the Continuum
Chiral Quasi-Bound States in the Continuum
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DOI：
10.1103/physrevlett.126.073001
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发表时间：
2021-02-17
影响因子：
8.6
通讯作者：
Alu, Andrea
中科院分区：
文献类型：
--
作者：
Overvig, Adam;Yu, Nanfang;Alu, Andrea
准束缚态是一类由破缺微扰控制的具有长光学寿命的Fano共振态。虽然传统的Fano响应仅限于线性偏振，不支持定制的相位控制，但在这里，我们引入了由手征扰动产生的QBIC，其编码任意椭圆偏振态并实现几何相位工程。因此，我们设计超尖锐的光谱特征，形状的冲击波前与近统一的效率。我们的研究结果将Fano共振扩展到传统极限之外，为纳米光子学，经典和量子光学和声学提供了机会。
Quasi-bound states in the continuum (QBICs) are Fano resonant states with long optical lifetimes controlled by symmetry-breaking perturbations. While conventional Fano responses are limited to linear polarizations and do not support tailored phase control, here we introduce QBICs born of chiral perturbations that encode arbitrary elliptical polarization states and enable geometric phase engineering. We thereby design metasurfaces with ultrasharp spectral features that shape the impinging wave front with near-unity efficiency. Our findings extend Fano resonances beyond their conventional limits, opening opportunities for nanophotonics, classical and quantum optics, and acoustics.