Unconventional Weyl exceptional contours in non-Hermitian photonic continua
- 16 November 2021
- journal article
- research article
- Published by Optica Publishing Group in Photonics Research
- Vol. 9 (12), 2435-2442
- https://doi.org/10.1364/prj.438769
Abstract
Unconventional Weyl points with topological charges higher than 1 can transform into various complex unconventional Weyl exceptional contours under non-Hermitian perturbations. However, theoretical studies of these exceptional contours have been limited to tight-binding models. Here, we propose to realize unconventional Weyl exceptional contours in photonic continua—non-Hermitian anisotropic chiral plasma, based on ab initio calculation by Maxwell’s equations. By perturbing in-plane permittivity, an unconventional Weyl point can transform into a quadratic Weyl exceptional ring, a type I Weyl exceptional chain with one chain point, a type II Weyl exceptional chain with two chain points, or other forms. Realistic metamaterials with effective constitutive parameters are proposed to implement these unconventional Weyl exceptional contours. Our work paves a way toward exploration of exotic physics of unconventional Weyl exceptional contours in non-Hermitian topological photonic continua.Keywords
Funding Information
- Top-Notch Young Talents Program of China
- Fundamental Research Funds for the Central Universities
- National Natural Science Foundation of China (11961141010, 61625502, 61975176, U19A2054)
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