Dielectric tuning and coupling of whispering gallery modes using an anisotropic prism

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Title: Dielectric tuning and coupling of whispering gallery modes using an anisotropic prism
Authors: Foreman, MR
Sedlmeir, F
Schwefel, HGL
Leuchs, G
Item Type: Journal Article
Abstract: Optical whispering gallery mode (WGM) resonators are a powerful and versatile tool in many branches of science. Fine-tuning of the central frequency and linewidth of individual resonances is, however, desirable in a number of applications, including frequency conversion, optical communications, and efficient light–matter coupling. To this end we present a detailed theoretical analysis of dielectric tuning of WGMs supported in axisymmetric resonators. Using the Bethe–Schwinger equation and adopting an angular spectrum field representation, we study the resonance shift and mode broadening of high-Q WGMs when a planar dielectric substrate is brought close to the resonator. Particular focus is given to use of a uniaxial substrate with an arbitrarily aligned optic axis. Competing red and blue resonance shifts (~30  MHz), deriving from generation of a near-field material polarization and back action from the radiation continuum, respectively, are found. Anomalous resonance shifts can hence be observed depending on the substrate material, whereas mode broadening on the order of ∼50  MHz can also be realized. Furthermore, polarization-selective coupling with extinction ratios of >10^4 can be achieved when the resonator and substrate are of the same composition and their optic axes are chosen correctly. Double refraction and properties of outcoupled beams are also discussed.
Issue Date: 30-Sep-2016
Date of Acceptance: 26-Aug-2016
ISSN: 0740-3224
Publisher: Optical Society of America
Start Page: 2177
End Page: 2195
Journal / Book Title: Journal of the Optical Society of America B - Optical Physics
Volume: 33
Copyright Statement: © 2016 Optical Society of America. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modifications of the content of this paper are prohibited.
Keywords: Optics
0205 Optical Physics
0906 Electrical And Electronic Engineering
0102 Applied Mathematics
Publication Status: Published
Appears in Collections:Photonics
Faculty of Natural Sciences

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