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- W2783408444 abstract "This paper introduces a self-biased broadband magnet-free and linear isolator based on one-way space-time coherency. The incident wave and the space-time-modulated medium share the same temporal frequency and are hence temporally coherent. However, thanks to the unidirectionally of the space-time modulation, the space-time-modulated medium and the incident wave are spatially coherent only in the forward direction and not in the opposite direction. As a consequence, the energy of the medium strongly couples to the propagating wave in the forward direction, while it conflicts with the propagating wave in the opposite direction, yielding strong isolation. We first derive a closed-form solution for the wave scattering from a spatiotemporally coherent medium and then show that a perfectly coherent space-time-modulated medium provides a moderate isolation level which is also subject to one-way transmission gain. To overcome this issue, we next investigate the effect of space-coherency imperfection between the medium and the wave, while they are still perfectly temporally coherent. Leveraging the spatial-coherency imperfection, the medium exhibits a quasiarbitrary and strong nonreciprocal transmission. Finally, we present the experimental demonstration of the self-biased version of the proposed broadband isolator, exhibiting more than $122%$ fractional operation bandwidth." @default.
- W2783408444 created "2018-01-26" @default.
- W2783408444 creator A5076990803 @default.
- W2783408444 date "2017-12-29" @default.
- W2783408444 modified "2023-10-10" @default.
- W2783408444 title "Self-biased broadband magnet-free linear isolator based on one-way space-time coherency" @default.
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- W2783408444 doi "https://doi.org/10.1103/physrevb.96.235150" @default.
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