论文标题
平面光子晶体结构中连续体的意外和对称保护的结合状态，由共振状态扩展研究
Accidental and symmetry-protected bound states in the continuum in planar photonic-crystal structures, studied by the resonant-state expansion
论文作者
论文摘要
共振状态扩展（RSE）提供了一种精确且计算上的便宜工具，可以使用更简单系统的光学模式在复杂系统中找到共振状态。我们将RSE应用于光子晶体平板，以识别和分析其连续体（BICS）中的结合状态。我们表明，RSE是一种有用且可靠的方法，它不仅可以找到BIC，还可以区分意外和对称性保护的BIC，以及通过系统的结构和材料参数从基础模式和进化中理解它们的形成。 RSE的高效率使我们能够跟踪BIC和其他高质量光学模式的属性，从而在合理的时间范围内涵盖了系统的完整参数空间。
The resonant-state expansion (RSE) provides a precise and computationally cheap tool to find resonant states in complex systems using the optical modes of a simpler system as a basis. We apply the RSE to a photonic crystal slab in order to identify and analyze its bound states in the continuum (BICs). We show that the RSE is a useful and reliable method for not only finding the BICs but also for differentiating between accidental and symmetry-protected BICs, as well as for understanding their formation from the basis modes and evolution with structural and material parameters of the system. The high efficiency of the RSE allows us to track the properties of BICs and other high-quality optical modes, covering the full parameter space of the system in a reasonable time frame.
