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A general model for taper coupling of multiple modes of whispering gallery resonators and application to analysis of coupling-induced Fano interference in a single cavity

A general model for taper coupling of multiple modes of whispering gallery resonators and application to analysis of coupling-induced Fano interference in a single cavity
A general model for taper coupling of multiple modes of whispering gallery resonators and application to analysis of coupling-induced Fano interference in a single cavity
In this paper, we give a general model for analysis of multimode Whispering Gallery Mode (WGM) resonators coupled to multimode tapered fibers based on the coupled-mode theory. Such formulation takes into account the asymmetry of the taper-resonator coupling. Simulations for a microsphere show that the tapered fiber coupling mechanism induces cross-coupling between coherent orthonormal WGMs. We show that the degree of such cross-coupling depends basically on the fiber diameter, air-gap between the taper and resonator, intrinsic losses and eccentricity. The WGM cross-coupling affects the total transmission and spectral line-shape of the internal powers resulting in a controllable transformation of the line-shape to non-Lorentzian spectra. This analysis can be utilized to precisely determine the output and intra-cavity intensity of multimode microresonators, which is important in lasers, nonlinear optical signal generation and realization of optical delays.
1094-4087
25493-2550
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) A general model for taper coupling of multiple modes of whispering gallery resonators and application to analysis of coupling-induced Fano interference in a single cavity. Optics Express, 27 (18), 25493-2550. (doi:10.1364/OE.27.025493).

Record type: Article

Abstract

In this paper, we give a general model for analysis of multimode Whispering Gallery Mode (WGM) resonators coupled to multimode tapered fibers based on the coupled-mode theory. Such formulation takes into account the asymmetry of the taper-resonator coupling. Simulations for a microsphere show that the tapered fiber coupling mechanism induces cross-coupling between coherent orthonormal WGMs. We show that the degree of such cross-coupling depends basically on the fiber diameter, air-gap between the taper and resonator, intrinsic losses and eccentricity. The WGM cross-coupling affects the total transmission and spectral line-shape of the internal powers resulting in a controllable transformation of the line-shape to non-Lorentzian spectra. This analysis can be utilized to precisely determine the output and intra-cavity intensity of multimode microresonators, which is important in lasers, nonlinear optical signal generation and realization of optical delays.

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Accepted/In Press date: 23 August 2019
Published date: 23 August 2019

Identifiers

Local EPrints ID: 433772
URI: http://eprints.soton.ac.uk/id/eprint/433772
ISSN: 1094-4087
PURE UUID: 0b7a2c33-8b0d-405c-87e1-470e4cf50192
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

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

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