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

Autor: Zhang, Xin-Zhe, Wu, Li-Ting, Luo, Ru-Zhi, Chen, Jing

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

Externí odkaz: http://arxiv.org/abs/2304.07289

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Non-Hermitian guided modes and exceptional points using loss-free negative-index materials

Autor: Wu, Li-Ting, Zhang, Xin-Zhe, Luo, Ru-Zhi, Chen, Jing

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

Externí odkaz: http://arxiv.org/abs/2303.15668

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Revisit the Poynting vector in PT-symmetric coupled waveguides

Autor: Zhang, Xin-Zhe, Luo, Ru-Zhi, Chen, Jing

We show that the time-averaged Poynting vector in parity-time (PT ) symmetric coupled waveguides is always positive and cannot explain the stopped light at exceptional points (EPs). In order to solve this paradox, we must accept the fact that the fie

Externí odkaz: http://arxiv.org/abs/2210.00273

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