Controllable oscillatory lateral coupling in a waveguide-microdisk-resonator system

Abstract We report a theoretical and experimental study of coupling between a whispering-gallery-mode (WGM) microdisk resonator and a fiber taper which exchange energies at two distinct regions. We observe an oscillatory behavior in the coupling strength as a function of the distance between the two...

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Autores principales:	Fang Bo, Şahin Kaya Özdemir, Faraz Monifi, Jing Zhang, Guoquan Zhang, Jingjun Xu, Lan Yang
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/d689614618cf4bc8ba27b24310ba0c8b
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spelling	oai:doaj.org-article:d689614618cf4bc8ba27b24310ba0c8b2021-12-02T15:05:41ZControllable oscillatory lateral coupling in a waveguide-microdisk-resonator system10.1038/s41598-017-08656-w2045-2322https://doaj.org/article/d689614618cf4bc8ba27b24310ba0c8b2017-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-08656-whttps://doaj.org/toc/2045-2322Abstract We report a theoretical and experimental study of coupling between a whispering-gallery-mode (WGM) microdisk resonator and a fiber taper which exchange energies at two distinct regions. We observe an oscillatory behavior in the coupling strength as a function of the distance between the two coupling regions when a fiber taper is moved laterally above the resonator at fixed vertical distance. This oscillation is clearly seen in the linewidth of the resonance as well as in the on-resonance transmission. A theoretical model considering for two-point coupling successfully explains the experimental observations as being a result of the interference between the light fields coupled into and out of the resonator at two distinct regions and the light transmitted through the waveguide. Critical coupling in two-region coupling is a collective result of the coupling at two different coupling regions, and does not require critical coupling at both or at any one of the two coupling regions. This relaxes the conditions for achieving critical coupling in waveguide-resonator systems. The discovery of this previously unnoticed oscillatory behavior in two-region coupling between a WGM resonator and a waveguide will benefit both fundamental studies and practical applications based on WGM resonators.Fang BoŞahin Kaya ÖzdemirFaraz MonifiJing ZhangGuoquan ZhangJingjun XuLan YangNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-7 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Fang Bo Şahin Kaya Özdemir Faraz Monifi Jing Zhang Guoquan Zhang Jingjun Xu Lan Yang Controllable oscillatory lateral coupling in a waveguide-microdisk-resonator system
description	Abstract We report a theoretical and experimental study of coupling between a whispering-gallery-mode (WGM) microdisk resonator and a fiber taper which exchange energies at two distinct regions. We observe an oscillatory behavior in the coupling strength as a function of the distance between the two coupling regions when a fiber taper is moved laterally above the resonator at fixed vertical distance. This oscillation is clearly seen in the linewidth of the resonance as well as in the on-resonance transmission. A theoretical model considering for two-point coupling successfully explains the experimental observations as being a result of the interference between the light fields coupled into and out of the resonator at two distinct regions and the light transmitted through the waveguide. Critical coupling in two-region coupling is a collective result of the coupling at two different coupling regions, and does not require critical coupling at both or at any one of the two coupling regions. This relaxes the conditions for achieving critical coupling in waveguide-resonator systems. The discovery of this previously unnoticed oscillatory behavior in two-region coupling between a WGM resonator and a waveguide will benefit both fundamental studies and practical applications based on WGM resonators.
format	article
author	Fang Bo Şahin Kaya Özdemir Faraz Monifi Jing Zhang Guoquan Zhang Jingjun Xu Lan Yang
author_facet	Fang Bo Şahin Kaya Özdemir Faraz Monifi Jing Zhang Guoquan Zhang Jingjun Xu Lan Yang
author_sort	Fang Bo
title	Controllable oscillatory lateral coupling in a waveguide-microdisk-resonator system
title_short	Controllable oscillatory lateral coupling in a waveguide-microdisk-resonator system
title_full	Controllable oscillatory lateral coupling in a waveguide-microdisk-resonator system
title_fullStr	Controllable oscillatory lateral coupling in a waveguide-microdisk-resonator system
title_full_unstemmed	Controllable oscillatory lateral coupling in a waveguide-microdisk-resonator system
title_sort	controllable oscillatory lateral coupling in a waveguide-microdisk-resonator system
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/d689614618cf4bc8ba27b24310ba0c8b
work_keys_str_mv	AT fangbo controllableoscillatorylateralcouplinginawaveguidemicrodiskresonatorsystem AT sahinkayaozdemir controllableoscillatorylateralcouplinginawaveguidemicrodiskresonatorsystem AT farazmonifi controllableoscillatorylateralcouplinginawaveguidemicrodiskresonatorsystem AT jingzhang controllableoscillatorylateralcouplinginawaveguidemicrodiskresonatorsystem AT guoquanzhang controllableoscillatorylateralcouplinginawaveguidemicrodiskresonatorsystem AT jingjunxu controllableoscillatorylateralcouplinginawaveguidemicrodiskresonatorsystem AT lanyang controllableoscillatorylateralcouplinginawaveguidemicrodiskresonatorsystem
_version_	1718388735717933056

Controllable oscillatory lateral coupling in a waveguide-microdisk-resonator system

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