Please use this identifier to cite or link to this item: https://hdl.handle.net/2440/92396
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Type: Conference item
Title: Predicting the whispering gallery mode spectra of microresonators
Author: Hall, J.M.M.
Afshar, S.
Henderson, M.R.
Francois, A.
Reynolds, T.
Riesen, N.
Monro, T.M.
Citation: Proceedings of SPIE, 2015 / Kudryashov, A.V., Paxton, A.H., Ilchenko, V.S., Aschke, L., Washio, K. (ed./s), vol.9343, pp.93431Y-1-93431Y-7
Publisher: Society of Photo-Optical Instrumentation Engineers (SPIE)
Issue Date: 2015
Series/Report no.: Proceedings of SPIE
ISBN: 9781628414332
ISSN: 0277-786X
1996-756X
Conference Name: Laser Resonators, Microresonators, and Beam Control XVII (9 Feb 2015 - 12 Feb 2015 : San Francisco, CA)
Editor: Kudryashov, A.V.
Paxton, A.H.
Ilchenko, V.S.
Aschke, L.
Washio, K.
Statement of
Responsibility: 
Jonathan M. M. Hall, Shahraam Afshar V., Matthew R. Henderson, Alexandre François, Tess Reynolds, Nicolas Riesen and Tanya M. Monro
Abstract: The whispering gallery modes (WGMs) of optical resonators have prompted intensive research efforts due to their usefulness in the field of biological sensing, and their employment in nonlinear optics. While much infor- mation is available in the literature on numerical modeling of WGMs in microspheres, it remains a challenging task to be able to predict the emitted spectra of spherical microresonators. Here, we establish a customizable Finite-Difference Time-Domain (FDTD)-based approach to investigate the electromagnetic WGM spectrum of microspheres. The simulations are carried out in the vicinity of a dipole source rather than a typical plane-wave beam excitation, thus providing an effective analogue of the fluorescent dye or nanoparticle coatings used in experiment. The analysis of a single dipole source at different positions on the surface or inside a microsphere, serves to assess the relative efficiency of nearby radiating TE and TM modes, characterizing the profile of the spectrum. By varying the number, positions and alignments of the dipole sources, different excitation scenarios can be compared to analytic models, and to experimental results. The energy flux is collected via a nearby disk-shaped region. The resultant spectral profile shows a dependence on the configuration of the dipole sources. The power outcoupling can then be optimized for specific modes and wavelength regions. The development of such a computational tool can aid the preparation of optical sensors prior to fabrication, by preselecting desired the optical properties of the resonator.
Keywords: Whispering gallery modes; Microresonators; Resonators; Optical devices; Microcavities; Computational optics; Optics modeling; Spectroscopy
Rights: © (2015) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE).
DOI: 10.1117/12.2078526
Published version: http://dx.doi.org/10.1117/12.2078526
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Physics publications

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