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Dielectric Mie nanoresonators showing strong light-matter interaction at thenanoscale may enable new functionality in photonic devices. Recently, strongmagneto-optical effects have been observed in magneto-optical nanophotonicdevices due to the electromagnetic field localization. However, most reports sofar have been focused on the enhancement of conventional magneto-opticaleffects. Here, we report the observation of circular displacement currentinduced anomalous magneto-optical effects in high-index-contrastSi/Ce:YIG/YIG/SiO2 Mie resonators. In particular, giant modulation of lightintensity in transverse magnetic configuration up to 6.4 % under s-polarizedincidence appears, which is non-existent in planar magneto-optical thin films.Apart from that, we observe a large rotation of transmitted light polarizationin the longitudinal magnetic configuration under near normal incidenceconditions, which is two orders of magnitude higher than for a planarmagneto-optical thin film. These phenomena are essentially originated from theunique circular displacement current when exciting the magnetic resonance modesin the Mie resonators, which changes the incident electric field directionlocally. Our work indicates an uncharted territory of light polarizationcontrol based on the complex modal profiles in all-dielectric magneto-opticalMie resonators and metasurfaces, which opens the door for versatile control oflight propagation by magnetization for a variety of applications in vectoralmagnetic field and biosensing, free space non-reciprocal photonic devices,magneto-optical imaging and optomagnetic memories.

Circular displacement current induced anomalous magneto-optical effects in high index Mie resonators