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Self-biased broadband magnet-free linear isolator based on one-way space-time coherency

Self-biased broadband magnet-free linear isolator based on one-way space-time coherency
Self-biased broadband magnet-free linear isolator based on one-way space-time coherency

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.

2469-9950
Taravati, Sajjad
0026f25d-c919-4273-b956-8fe9795b31ce
Taravati, Sajjad
0026f25d-c919-4273-b956-8fe9795b31ce

Taravati, Sajjad (2017) Self-biased broadband magnet-free linear isolator based on one-way space-time coherency. Physical Review B, 96 (23), [235150]. (doi:10.1103/PhysRevB.96.235150).

Record type: Article

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.

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More information

Published date: 29 December 2017
Additional Information: Publisher Copyright: © 2017 American Physical Society.

Identifiers

Local EPrints ID: 482625
URI: http://eprints.soton.ac.uk/id/eprint/482625
ISSN: 2469-9950
PURE UUID: adc51e17-0bef-4272-b913-c03fcc512939
ORCID for Sajjad Taravati: ORCID iD orcid.org/0000-0003-3992-0050

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Date deposited: 10 Oct 2023 17:01
Last modified: 03 May 2024 02:06

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Contributors

Author: Sajjad Taravati ORCID iD

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