[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.
Disciplines :
Physics
Author, co-author :
Lopez-Ortega, Alberto; Universidad de Castilla-La Mancha
Zapata-Herrera, Mario; CIC nanoGUNE
Maccaferri, Nicolò ; 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
External co-authors :
yes
Language :
English
Title :
Enhanced magnetic modulation of light polarization exploiting hybridization with multipolar dark plasmons in magnetoplasmonic nanocavities