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physics.optics2023★ 5 cited
Non-Hermitian guided modes and exceptional points using loss-free negative-index materials
Li-Ting Wu, Xin-Zhe Zhang, Ru-Zhi Luo +1
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 guide…
physics.optics2022★ 7 cited
Revisit the Poynting vector in PT-symmetric coupled waveguides
Xin-Zhe Zhang, Ru-Zhi Luo, Jing Chen
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)…