Non-Hermitian guided modes and exceptional points using loss-free negative-index materials
Optics
2023-04-26 v1 Classical Physics
Abstract
We analyze the guided modes in coupled waveguides made of negative-index materials without gain or loss. We show that it supports non-Hermitian phenomenon on the existence of guided mode versus geometric parameters of the structure. The non-Hermitian effect is different from parity-time (PT) symmetry, and can be explained by a simple coupled-mode theory with an anti-PT symmetry. The existence of exceptional points and slow-light effect are discussed. This work highlights the potential of loss-free negative-index materials in the study of non-Hermitian optics.
Cite
@article{arxiv.2303.15668,
title = {Non-Hermitian guided modes and exceptional points using loss-free negative-index materials},
author = {Li-Ting Wu and Xin-Zhe Zhang and Ru-Zhi Luo and Jing Chen},
journal= {arXiv preprint arXiv:2303.15668},
year = {2023}
}