Perturbation theories for symmetry-protected bound states in the continuum on two-dimensional periodic structures

@article{Yuan2020PerturbationTF,
  title={Perturbation theories for symmetry-protected bound states in the continuum on two-dimensional periodic structures},
  author={Lijun Yuan and Ya Yan Lu},
  journal={Physical Review A},
  year={2020}
}
On dielectric periodic structures with a reflection symmetry in a periodic direction, there can be antisymmetric standing waves (ASWs) that are symmetry-protected bound states in the continuum (BICs). The BICs have found many applications, mainly because they give rise to resonant modes of extremely large quality-factors ($Q$-factors). The ASWs are robust to symmetric perturbations of the structure, but they become resonant modes if the perturbation is non-symmetric. The $Q$-factor of a… 

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