诺共振
物理
束缚态
法诺平面
波前
极化(电化学)
光学
超材料
几何相位
量子力学
等离子体子
几何学
数学
物理化学
化学
作者
Adam Overvig,Nanfang Yu,Andrea Alù
标识
DOI:10.1103/physrevlett.126.073001
摘要
Quasi-bound states in the continuum (q-BICs) are resonant states of suitably tailored nanostructures with long optical lifetimes controlled by symmetry-breaking perturbations. While in planarized ultrathin devices the resulting Fano resonance is limited to linear polarizations, we show here that chiral perturbations extend q-BIC concepts to arbitrary elliptical polarizations. Using geometric phase engineering, we realize metasurfaces with ultrasharp Fano spectral features that can shape the impinging wavefront with near-unity efficiency, while at the same time precisely filtering their spectral content.
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