Cross-polarization coupling of whispering-gallery modes due to the spin-orbit interaction of light

A. T. Rosenberger

doi:10.1117/12.2508013

4 March 2019 Cross-polarization coupling of whispering-gallery modes due to the spin-orbit interaction of light

A. T. Rosenberger

Proceedings Volume 10904, Laser Resonators, Microresonators, and Beam Control XXI; 109041C (2019) https://doi.org/10.1117/12.2508013
Event: SPIE LASE, 2019, San Francisco, California, United States

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.

Citation Download Citation

A. T. Rosenberger "Cross-polarization coupling of whispering-gallery modes due to the spin-orbit interaction of light", Proc. SPIE 10904, Laser Resonators, Microresonators, and Beam Control XXI, 109041C (4 March 2019); https://doi.org/10.1117/12.2508013

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KEYWORDS

Resonators

Polarization

Microresonators

Capillaries

Refractive index

Silica

Transparency

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