Higher-order exceptional points in loss-free waveguide arrays with negative-index materials
Classical Physics
2023-04-19 v2 Optics
Abstract
Negative-index materials (NIMs) are shown to support optical anti-parity-time (anti-PT) symmetry even when they are lossless. Here we prove the feasibility in achieving higher-order exceptional points (EPs) in loss-free waveguide arrays by utilizing the anti- symmetry induced by NIM. Numerical simulation about a third-order EP fits well with the coupled-mode theory. A scheme of achieving fourth-order EPs is also discussed. This work highlights the potential of loss-free NIMs in the study of non-Hermitian optics.
Keywords
Cite
@article{arxiv.2304.07289,
title = {Higher-order exceptional points in loss-free waveguide arrays with negative-index materials},
author = {Xin-Zhe Zhang and Li-Ting Wu and Ru-Zhi Luo and Jing Chen},
journal= {arXiv preprint arXiv:2304.07289},
year = {2023}
}