Magneto-plasmonic metamaterials

Collective oscillation of free-like electrons of a metallic nanostructure induced by resonant coupling with the electromagnetic radiation, namely a localized surface plasmon polariton, excited in hybrid structures , named magneto-plasmonic nanostructures, comprising noble metals and magneto-optical active ferromagnetic metals allows for the active tuning of light polarization via an external magnetic stimulus. The active tuning is further enhanced by arranging the magneto-plasmonic nanostructures in a specific motif on a dielectric substrate, thereby realizing a so-called magneto-plasmonic metamaterial or crystal. Magneto-plasmonic metamaterials have potential applications in nanophotonics and ultra-sensitive biosensing.

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References:

• “Plasmonic Phase Tuning of Magneto-Optics in Ferromagnetic Nanostructures”, N. Maccaferri, A. Berger S. Bonetti, V. Bonanni, M. V. Kataja, S. van Dijken, Z.Pirzadeh, A. Dmitriev, J. Åkerman, J. Nogués, and P. Vavassori, Phys. Rev. Lett. 111, 167401 (2013).

• “Ultrasensitive and label-free molecular-level detection enabled by light phase control in magnetoplasmonic nanoantennas”, N. Maccaferri, K. E. Gregorczyk, T. V.A.G. de Oliveira, M. Kataja, S. van Dijken, Z. Pirzadeh, A. Dmitriev, J. Åkerman, M. Knez, and P. Vavassori, Nat. Commun. 6, 6150 (2015).

• “Anisotropic Nanoantenna-Based Magnetoplasmonic Crystals for Highly Enhanced and Tunable Magneto-Optical Activity”, N. Maccaferri, L. Bergamini, M. Pancaldi, M. K. Schmidt, M. Kataja, S. van Dijken, N. Zabala, Javier Aizpurua, and P. Vavassori, Nano Lett. 16, 2533-2542 (2016).

• “Enhanced magnetic modulation of light polarization exploiting hybridization with multipolar dark plasmons in magnetoplasmonic nanocavities”, A. López-Ortega, M. Zapata-Herrera, N. Maccaferri, M. Pancaldi, M. Garcia, A. Chuvilin, and P. Vavassori, Light: Science&Applications 9, 49 (2020).