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Cross-polarization coupling of whispering-gallery modes due to the spin-orbit interaction of light
Author(s): A. T. Rosenberger
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Paper Abstract

Light can couple between TE and TM whispering-gallery modes (WGMs) of a microresonator; the effect is easily observable when those modes are frequency-degenerate, and can result in coupled-mode induced transparency (CMIT). Fitting experimental observations of CMIT with a numerical model in which the cross-polarization coupling strength is a free parameter shows that the coupling strength is typically 10-8 – 10-7 per round trip. It is shown here that polarization rotation of this magnitude can result from optical spin-orbit interaction through the asymmetry of a WGM. Using the eikonal approximation to describe a WGM, along with asymmetry of the microresonator about its equator, the maximum possible polarization rotation per round trip can be calculated. Then accounting for spatial overlap and phase mismatch of the coresonant WGMs, using coupled-mode theory, gives coupling strengths in agreement with experiment.

Paper Details

Date Published: 4 March 2019
PDF: 7 pages
Proc. SPIE 10904, Laser Resonators, Microresonators, and Beam Control XXI, 109041C (4 March 2019); doi: 10.1117/12.2508013
Show Author Affiliations
A. T. Rosenberger, Oklahoma State Univ. (United States)

Published in SPIE Proceedings Vol. 10904:
Laser Resonators, Microresonators, and Beam Control XXI
Alexis V. Kudryashov; Alan H. Paxton; Vladimir S. Ilchenko, Editor(s)

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