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- W3132874273 abstract "Recently, several applications leveraging unconventional manipulation of electromagnetic radiation based on parity-time symmetry have been proposed in the literature. Typical examples include systems with unidirectional invisibility and asymmetric refraction. Such applications assume an inherent system stability and no occurrence of unbounded signal growth or unwanted self-oscillations. Here, a general instability issue of parity-time-symmetric systems is investigated, with particular emphasis on a recently proposed system based on resistive metasurfaces. Explicit closed-form stability criterion is derived, crosschecked and verified by both time-domain transient simulations and the measurements on an experimental demonstrator operating in a lower radiofrequency range. Results of this study lead to the conclusion that any parity-time-symmetric system is necessarily marginally stable. Finally, it is shown that such a marginally stable system may easily become unstable if not designed carefully." @default.
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- W3132874273 date "2021-02-18" @default.
- W3132874273 modified "2023-09-29" @default.
- W3132874273 title "Stability Constraints on Practical Implementation of Parity-Time-Symmetric Electromagnetic Systems" @default.
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- W3132874273 doi "https://doi.org/10.3390/photonics8020056" @default.
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