Coupling of light from a microresonator TE mode to a coresonant TM mode will have a different strength than that of coupling from the TM mode to the TE mode. This coupling nonreciprocity, deriving from the optical spin-orbit interaction, is modeled numerically and confirmed experimentally by observing coupled-mode induced transparency and AutlerTownes splitting. By measuring the throughput spectrum in both polarizations when the input directly excites modes of only one polarization, the coupling strengths in both directions can be determined simultaneously by fitting to the numerical model. Some examples and implications are discussed here.
Theoretical calculation of the cross-polarization coupling between whispering-gallery modes in a microresonator shows that this coupling is, in general, asymmetric. The spin-orbit induced coupling of light from a TE mode to a coresonant TM mode will have a different strength than that of the coupling from the TM mode to the TE mode. This coupling asymmetry is confirmed in coupled-mode induced transparency experiments. By monitoring the throughput spectrum in both polarizations when the input directly excites only modes of one polarization, the coupling strengths in both directions are determined simultaneously by fitting to a model. Some examples and implications are discussed here.
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