论文标题
连续性的手性准结合状态
Chiral Quasi-Bound States in the Continuum
论文作者
论文摘要
连续体（Q-BICS）中的准结合状态是适当量身定制的纳米结构的共振状态，其光学寿命很长，受对称性破坏的扰动控制。尽管在平面化的超薄设备中，所得的Fano共振仅限于线性极化，但我们在这里表明手性扰动将Q-BIC概念扩展到任意椭圆极化。使用几何相工程，我们实现具有超纯FANO光谱特征的元时间，这些特征可以以近乎义务的效率来影响撞击波前，同时又可以精确地过滤其频谱含量。
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.
