A general electrodynamical theory of a high-Q optical microsphere resonator in an external alternating magnetic field is reported. We show that such a system can change a polarization state of the whispering-gallery-mode photons confined in the sphere due to the Faraday effect. This property can be used in all-optical switches and logical devices. The contribution of the Kerr nonlinearities is also discussed.
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Smirnov et al. (2002) studied this question.
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