Reference : Enhanced magnetic modulation of light polarization exploiting hybridization with mult...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
Physics and Materials Science
Enhanced magnetic modulation of light polarization exploiting hybridization with multipolar dark plasmons in magnetoplasmonic nanocavities
Lopez-Ortega, Alberto [Universidad de Castilla-La Mancha]
Zapata-Herrera, Mario [CIC nanoGUNE]
Maccaferri, Nicolò mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit >]
Pancaldi, Matteo [University of Stockholm]
Garcia, Mikel [CIC nanoGUNE]
Chuvilin, Andrey []
Vavassori, Paolo [CIC nanoGUNE]
Light: Science and Applications
Nature Publishing Group
Yes (verified by ORBilu)
United Kingdom
[en] Enhancing magneto-optical effects is crucial for size reduction of key photonic devices based on non-reciprocal propagation of light and to enable active nanophotonics. Here, we disclose a so far unexplored approach that exploits hybridization with multipolar dark modes in specially designed magnetoplasmonic nanocavities to achieve a large enhancement of the magneto-optically induced modulation of light polarization. The broken geometrical symmetry of the design enables coupling with free-space light and hybridization of multipolar dark modes of a plasmonic ring nanoresonator with the dipolar localized plasmon resonance of the ferromagnetic disk placed inside the ring. Such hybridization results in a low-radiant multipolar Fano resonance that drives a strongly enhanced magneto-optically induced localized plasmon. The large amplification of the magneto-optical response of the nanocavity is the result of the large magneto-optically induced change of light polarization produced by the strongly enhanced radiant magneto-optical dipole, which is achieved avoiding the simultaneous enhancement of re-emitted light with the incident polarization by the driving multipolar Fano resonance. The partial compensation of the magneto-optically induced polarization change caused by the large re-emission of light with the original polarization is a critical limitation of magnetoplasmonic designs explored so far.

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