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Enhancing magneto-optical effects is crucial for size reduction of keyphotonic devices based on non-reciprocal propagation of light and to enableactive nanophotonics. We disclose a so far unexplored approach that exploitsdark plasmons to produce an unprecedented amplification of magneto-opticalactivity. We designed and fabricated non-concentricmagnetoplasmonic-disk/plasmonic-ring-resonator nanocavities supportingmultipolar dark modes. The broken geometrical symmetry of the design enablescoupling with free-space light and hybridization of dark modes of the ringnanoresonator with the dipolar localized plasmon resonance of themagnetoplasmonic disk. Such hybridization generates a multipolar resonance thatamplifies the magneto-optical response of the nanocavity by ~1-order ofmagnitude with respect to the maximum enhancement achievable by localizedplasmons in bare magnetoplasmonic nanoantennas. This large amplificationresults from the peculiar and enhanced electrodynamic response of thenanocavity, yielding an intense magnetically-activated radiant magneto-opticaldipole driven by the low-radiant multipolar resonance. The concept proposed isgeneral and, therefore, our results open a new path that can revitalizeresearch and applications of magnetoplasmonics to active nanophotonics and flatoptics.

Magnetoplasmonics in nanocavities: Dark plasmons enhance magneto-optics beyond the intrinsic limit of magnetoplasmonic nanoantennas