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- W2894637063 abstract "The coupling strength between two parity-time (PT) symmetric resonators determines whether the PT phase is broken or not. Here we investigate the scenario that two optical waveguides are spatially curved so that they switch periodically between unbroken and broken PT phases. We show that the existence of locally broken PT phase does not necessarily render a broken phase to waves propagating inside. Criteria are proposed to characterize the collective dynamics of wave near the Brillouin zone (BZ) edge, toward the cases of a totally broken phase, a partially broken phase, or a totally unbroken phase. We also discuss the characteristics of two special kinds of exceptional points (EPs) at the BZ edge, and show that their field patterns are displaced by half a period with each other. Full-wave numerical simulation proves our analysis. Potential applications especially these associated with EPs are discussed. This study helps us to understand how the locally PT-symmetric related eigenstate influences the globally collective dynamics of wave in spatially periodic configuration." @default.
- W2894637063 created "2018-10-12" @default.
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- W2894637063 date "2018-10-03" @default.
- W2894637063 modified "2023-10-17" @default.
- W2894637063 title "Parity-time symmetry in periodically curved optical waveguides" @default.
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- W2894637063 doi "https://doi.org/10.1364/oe.26.027141" @default.
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