A symmetry-protected exceptional ring in a photonic crystal with negative index media
arXiv:2212.11090 · doi:10.1515/nanoph-2022-0747
Abstract
Non-Hermitian topological band structures such as symmetry-protected exceptional rings (SPERs) can emerge for systems described by the generalized eigenvalue problem (GEVP) with Hermitian matrices. In this paper, we numerically analyze a photonic crystal with negative index media, which is described by the GEVP with Hermitian matrices. Our analysis using COMSOL Multiphysics demonstrates that a SPER emerges for photonic crystals composed of split-ring resonators and metal-wire structures. We expect that the above SPER can be observed in experiments as it emerges at a finite frequency.
11 pages, 7 figures
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- Exceptional rings in nonlinear non-Hermitian planar optical microcavities: implementation, signal enhancement, and topology