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Efficient excitation and phase matching of fiber-coupled degenerate whispering gallery modes

Efficient excitation and phase matching of fiber-coupled degenerate whispering gallery modes
Efficient excitation and phase matching of fiber-coupled degenerate whispering gallery modes
The ability of optical whispering gallery mode (WGM) resonators to store energy in a very small volume for a long time enables their use in practical applications as low-threshold lasers, high-sensitivity sensors, and tunable add-drop filters. In this paper, we express in detail the tapered fiber asymmetric coupling mechanism to multimode microsphere resonators in order to selectively excite or collect WGMs. It is shown that due to the close effective refractive indices of degenerate spherical WGMs, depending on the amount of phase matching and overlap of fiber and resonator modes, a combination of WGMs with certain intrinsic losses is excited. By precisely designing the taper dimensions, critical coupling to one or a group of modes can be satisfied. This paper provides a general figure of merit for designing taper-coupled microresonators that can be employed in nonlinear optics and lasers in which the intra-cavity field distribution determines the characteristics of the device.
0740-3224
2452-2460
Bakhtiari Gorajoobi, Shahab
ba37e5f9-6a5e-4beb-82eb-b932613fba55
Murugan, Ganapathy Senthil
a867686e-0535-46cc-ad85-c2342086b25b
Zervas, Michael
1840a474-dd50-4a55-ab74-6f086aa3f701
Bakhtiari Gorajoobi, Shahab
ba37e5f9-6a5e-4beb-82eb-b932613fba55
Murugan, Ganapathy Senthil
a867686e-0535-46cc-ad85-c2342086b25b
Zervas, Michael
1840a474-dd50-4a55-ab74-6f086aa3f701

Bakhtiari Gorajoobi, Shahab, Murugan, Ganapathy Senthil and Zervas, Michael (2019) Efficient excitation and phase matching of fiber-coupled degenerate whispering gallery modes. Journal of the Optical Society of America B, 36 (9), 2452-2460. (doi:10.1364/JOSAB.36.002452).

Record type: Article

Abstract

The ability of optical whispering gallery mode (WGM) resonators to store energy in a very small volume for a long time enables their use in practical applications as low-threshold lasers, high-sensitivity sensors, and tunable add-drop filters. In this paper, we express in detail the tapered fiber asymmetric coupling mechanism to multimode microsphere resonators in order to selectively excite or collect WGMs. It is shown that due to the close effective refractive indices of degenerate spherical WGMs, depending on the amount of phase matching and overlap of fiber and resonator modes, a combination of WGMs with certain intrinsic losses is excited. By precisely designing the taper dimensions, critical coupling to one or a group of modes can be satisfied. This paper provides a general figure of merit for designing taper-coupled microresonators that can be employed in nonlinear optics and lasers in which the intra-cavity field distribution determines the characteristics of the device.

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Phase_MatchingJOSAB - Accepted Manuscript
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More information

Accepted/In Press date: 24 July 2019
e-pub ahead of print date: 13 August 2019
Published date: September 2019

Identifiers

Local EPrints ID: 434624
URI: http://eprints.soton.ac.uk/id/eprint/434624
ISSN: 0740-3224
PURE UUID: 5a590ecf-510a-4dcb-88d5-d52878466abd
ORCID for Ganapathy Senthil Murugan: ORCID iD orcid.org/0000-0002-2733-3273
ORCID for Michael Zervas: ORCID iD orcid.org/0000-0002-0651-4059

Catalogue record

Date deposited: 03 Oct 2019 16:30
Last modified: 18 Feb 2021 17:05

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