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

2023/03/28 by Zhang, Xin-Zhe, Wu, Li-Ting, Luo, Ru-Zhi +1
#Classical Physics (physics.class-ph) #FOS: Physical sciences #Optics (physics.optics)

paper · doi:10.48550/arxiv.2304.07289

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-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.

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