Optica Open
Browse

Higher-order exceptional points in loss-free waveguide arrays with negative-index materials

Download (5.58 kB)
preprint
posted on 2023-04-20, 16:00 authored by Xin-Zhe Zhang, Li-Ting Wu, Ru-Zhi Luo, Jing Chen
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-$\mathcal{PT}$ 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.

History

Disclaimer

This arXiv metadata record was not reviewed or approved by, nor does it necessarily express or reflect the policies or opinions of, arXiv.

Usage metrics

    Categories

    Licence

    Exports

    RefWorks
    BibTeX
    Ref. manager
    Endnote
    DataCite
    NLM
    DC