Complete linear optical isolation at the microscale with ultralow loss

Low-loss optical isolators and circulators are critical nonreciprocal components for signal routing and protection, but their chip-scale integration is not yet practical using standard photonics foundry processes. The significant challenges that confront integration of magneto-optic nonreciprocal sy...

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Autores principales:	JunHwan Kim, Seunghwi Kim, Gaurav Bahl
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/6f6884182243441eafd11bdd2c0a362c
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spelling	oai:doaj.org-article:6f6884182243441eafd11bdd2c0a362c2021-12-02T15:05:59ZComplete linear optical isolation at the microscale with ultralow loss10.1038/s41598-017-01494-w2045-2322https://doaj.org/article/6f6884182243441eafd11bdd2c0a362c2017-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-01494-whttps://doaj.org/toc/2045-2322Low-loss optical isolators and circulators are critical nonreciprocal components for signal routing and protection, but their chip-scale integration is not yet practical using standard photonics foundry processes. The significant challenges that confront integration of magneto-optic nonreciprocal systems on chip have made imperative the exploration of magnet free alternatives. However, none of these approaches have yet demonstrated linear optical isolation with ideal characteristics over a microscale footprint – simultaneously incorporating large contrast with ultralow forward loss – having fundamental compatibility with photonic integration in standard waveguide materials. Here we demonstrate that complete linear optical isolation can be obtained within any dielectric waveguide using only a whispering-gallery microresonator pumped by a single-frequency laser. The isolation originates from a nonreciprocal induced transparency based on a coherent light-sound interaction, with the coupling originating from the traveling-wave Brillouin scattering interaction, that breaks time-reversal symmetry within the waveguide-resonator system. Our result demonstrates that material-agnostic and wavelength-agnostic optical isolation is far more accessible for chip-scale photonics than previously thought.JunHwan KimSeunghwi KimGaurav BahlNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-9 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q JunHwan Kim Seunghwi Kim Gaurav Bahl Complete linear optical isolation at the microscale with ultralow loss
description	Low-loss optical isolators and circulators are critical nonreciprocal components for signal routing and protection, but their chip-scale integration is not yet practical using standard photonics foundry processes. The significant challenges that confront integration of magneto-optic nonreciprocal systems on chip have made imperative the exploration of magnet free alternatives. However, none of these approaches have yet demonstrated linear optical isolation with ideal characteristics over a microscale footprint – simultaneously incorporating large contrast with ultralow forward loss – having fundamental compatibility with photonic integration in standard waveguide materials. Here we demonstrate that complete linear optical isolation can be obtained within any dielectric waveguide using only a whispering-gallery microresonator pumped by a single-frequency laser. The isolation originates from a nonreciprocal induced transparency based on a coherent light-sound interaction, with the coupling originating from the traveling-wave Brillouin scattering interaction, that breaks time-reversal symmetry within the waveguide-resonator system. Our result demonstrates that material-agnostic and wavelength-agnostic optical isolation is far more accessible for chip-scale photonics than previously thought.
format	article
author	JunHwan Kim Seunghwi Kim Gaurav Bahl
author_facet	JunHwan Kim Seunghwi Kim Gaurav Bahl
author_sort	JunHwan Kim
title	Complete linear optical isolation at the microscale with ultralow loss
title_short	Complete linear optical isolation at the microscale with ultralow loss
title_full	Complete linear optical isolation at the microscale with ultralow loss
title_fullStr	Complete linear optical isolation at the microscale with ultralow loss
title_full_unstemmed	Complete linear optical isolation at the microscale with ultralow loss
title_sort	complete linear optical isolation at the microscale with ultralow loss
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/6f6884182243441eafd11bdd2c0a362c
work_keys_str_mv	AT junhwankim completelinearopticalisolationatthemicroscalewithultralowloss AT seunghwikim completelinearopticalisolationatthemicroscalewithultralowloss AT gauravbahl completelinearopticalisolationatthemicroscalewithultralowloss
_version_	1718388649476751360

Complete linear optical isolation at the microscale with ultralow loss

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