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We propose using a single magneto-dielectric microsphere as a device forenhancing the transverse Faraday effect at multiple wavelengths at the sametime. Although the diameter of the sphere can be $<1$ $\mu$m, the numericallypredicted strength of its magneto-optical (MO) response can be an order ofmagnitude stronger than in MO devices based on thick magnetic plates. The MOresponse of a microsphere is also comparable with that of subwavelengthmagneto-dielectric gratings which, however, operate at a single wavelength andoccupy a large area. In contrast to gratings and thick plates, the compact sizeof the microsphere and its capability to support spin-wave excitations make itsuitable for applications in nanophotonics, imaging systems, and magnonics.

Multifrequency transverse Faraday effect in single magneto-dielectric microspheres