Plasmonic Moon: A Fano-Like Approach for Squeezing the Magnetic Field in the Infrared.
Outstanding results have been achieved in the localization of optical electric fields via ultrasmall plasmonic cavities, paving the way to the subdiffractive confinement of local electromagnetic fields. However, due to the intrinsic constraints related to conventional architectures, no comparable squeezing factors have been managed yet for the magnetic counterpart of radiation, practically hindering the detection and manipulation of magneto-optical effects at the nanoscale. Here, we observe a strong magnetic field nanofocusing in the infrared, promoted by the induction of a coil-type Fano resonance. By triggering the coil current via a quadrupole-like plasmonic mode, we straightforwardly boost the enhancement of the infrared magnetic field and perform its efficient squeezing in localized nanovolumes.
Istituto Italiano di Tecnologia , via Morego 30, Genova 16163, Italy.|Università degli Studi di Genova , Genova 16145, Italy.
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Panaro
Istituto Italiano di Tecnologia , via Morego 30, Genova 16163, Italy.|Università degli Studi di Genova , Genova 16145, Italy.
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Nazir
Istituto Italiano di Tecnologia , via Morego 30, Genova 16163, Italy.
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Proietti Zaccaria
INRS Énergie, Matériaux et Télécommunications, 1650 Blvd Lionel Boulet, J3X 1S2 Varennes, Québec, Canada.
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Razzari
Istituto Italiano di Tecnologia , via Morego 30, Genova 16163, Italy.
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Liberale
Istituto Italiano di Tecnologia , via Morego 30, Genova 16163, Italy.
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De Angelis
Istituto Italiano di Tecnologia , via Morego 30, Genova 16163, Italy.
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Toma
Fano resonances; artificial magnetism; dark plasmons; magnetic squeezing; plasmonic antennas