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Position-dependent coupling between a channel waveguide and a distorted microsphere resonator

Position-dependent coupling between a channel waveguide and a distorted microsphere resonator
Position-dependent coupling between a channel waveguide and a distorted microsphere resonator
Glass microsphere resonators have the potential to add significant functionality to planar lightwave circuits when coupled to waveguides where they can provide wavelength filtering, delay and low-power switching, and laser functions. Design of such photonic circuits requires precise coupling between spheres and waveguides to allow control of Q-factor and hence of stored energy and resonator bandwidth. In this paper an erbium-doped silicate glass microsphere is coupled to an ion-exchanged glass waveguide, and excitation spectra for the sphere whispering-gallery modes are determined as a function of spatial separation. Modal assignment allows extraction of the physical parameters of the microsphere and the dependence of Q-factor with separation is compared with theory. All practical microspheres exhibit a small degree of ellipticity and the effects of this upon whispering-gallery mode excitation and wavelength splitting are explored. It has been shown that appropriate displacement and orientation of slightly deformed microspheres with respect to the waveguide can be used to control the effective Q-factor and optimize the spectral shape of the optical devices. This can result in either single high-Q peaks or substantially broadened and spectrally flattened resonances.
0021-8979
053105-[9pp]
Murugan, Ganapathy Senthil
a867686e-0535-46cc-ad85-c2342086b25b
Panitchob, Yuwapat
4f0a194f-e533-4dda-88c2-6837a473c12e
Tull, Elizabeth J.
a5bc1534-4c85-400b-826d-2d9012442faa
Bartlett, Philip N.
d99446db-a59d-4f89-96eb-f64b5d8bb075
Hewak, Daniel W.
87c80070-c101-4f7a-914f-4cc3131e3db0
Zervas, Michalis
1840a474-dd50-4a55-ab74-6f086aa3f701
Wilkinson, James S.
73483cf3-d9f2-4688-9b09-1c84257884ca
Murugan, Ganapathy Senthil
a867686e-0535-46cc-ad85-c2342086b25b
Panitchob, Yuwapat
4f0a194f-e533-4dda-88c2-6837a473c12e
Tull, Elizabeth J.
a5bc1534-4c85-400b-826d-2d9012442faa
Bartlett, Philip N.
d99446db-a59d-4f89-96eb-f64b5d8bb075
Hewak, Daniel W.
87c80070-c101-4f7a-914f-4cc3131e3db0
Zervas, Michalis
1840a474-dd50-4a55-ab74-6f086aa3f701
Wilkinson, James S.
73483cf3-d9f2-4688-9b09-1c84257884ca

Murugan, Ganapathy Senthil, Panitchob, Yuwapat, Tull, Elizabeth J., Bartlett, Philip N., Hewak, Daniel W., Zervas, Michalis and Wilkinson, James S. (2010) Position-dependent coupling between a channel waveguide and a distorted microsphere resonator. Journal of Applied Physics, 107 (5), 053105-[9pp]. (doi:10.1063/1.3327418).

Record type: Article

Abstract

Glass microsphere resonators have the potential to add significant functionality to planar lightwave circuits when coupled to waveguides where they can provide wavelength filtering, delay and low-power switching, and laser functions. Design of such photonic circuits requires precise coupling between spheres and waveguides to allow control of Q-factor and hence of stored energy and resonator bandwidth. In this paper an erbium-doped silicate glass microsphere is coupled to an ion-exchanged glass waveguide, and excitation spectra for the sphere whispering-gallery modes are determined as a function of spatial separation. Modal assignment allows extraction of the physical parameters of the microsphere and the dependence of Q-factor with separation is compared with theory. All practical microspheres exhibit a small degree of ellipticity and the effects of this upon whispering-gallery mode excitation and wavelength splitting are explored. It has been shown that appropriate displacement and orientation of slightly deformed microspheres with respect to the waveguide can be used to control the effective Q-factor and optimize the spectral shape of the optical devices. This can result in either single high-Q peaks or substantially broadened and spectrally flattened resonances.

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Published date: 4 March 2010

Identifiers

Local EPrints ID: 144987
URI: https://eprints.soton.ac.uk/id/eprint/144987
ISSN: 0021-8979
PURE UUID: a931082b-f18e-4169-b3fc-e82288169253
ORCID for Ganapathy Senthil Murugan: ORCID iD orcid.org/0000-0002-2733-3273
ORCID for Philip N. Bartlett: ORCID iD orcid.org/0000-0002-7300-6900
ORCID for Daniel W. Hewak: ORCID iD orcid.org/0000-0002-2093-5773
ORCID for Michalis Zervas: ORCID iD orcid.org/0000-0002-0651-4059
ORCID for James S. Wilkinson: ORCID iD orcid.org/0000-0003-4712-1697

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Date deposited: 15 Apr 2010 14:03
Last modified: 15 Aug 2019 00:58

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Contributors

Author: Yuwapat Panitchob
Author: Elizabeth J. Tull
Author: Daniel W. Hewak ORCID iD
Author: Michalis Zervas ORCID iD

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