title: Anisotropic Nanoantenna-Based Magnetoplasmonic Crystals for Highly Enhanced and Tunable Magneto-Optical Activity.
abstract: We present a novel concept of a magnetically tunable plasmonic crystal based on the excitation of Fano lattice surface modes in periodic arrays of magnetic and optically anisotropic nanoantennas. We show how coherent diffractive far-field coupling between elliptical nickel nanoantennas is governed by the two in-plane, orthogonal and spectrally detuned plasmonic responses of the individual building block, one directly induced by the incident radiation and the other induced by the application of an external magnetic field. The consequent excitation of magnetic field-induced Fano lattice surface modes leads to highly tunable and amplified magneto-optical effects as compared to a continuous film or metasurfaces made of disordered noninteracting magnetoplasmonic anisotropic nanoantennas. The concepts presented here can be exploited to design novel magnetoplasmonic sensors based on coupled localized plasmonic resonances, and nanoscale metamaterials for precise control and magnetically driven tunability of light polarization states.
authors.affiliation: CIC nanoGUNE , E-20018 Donostia-San Sebastian, Spain.
authors.forename: Nicolò
authors.initials: N
authors.lastname: Maccaferri
authors.affiliation: Department of Electricity and Electronics, Faculty of Science and Technology, UPV/EHU , E-48080 Bilbao, Spain.|Materials Physics Center CSIC-UPV/EHU and Donostia International Physics Center, DIPC , E-20018 Donostia-San Sebastian, Spain.
authors.forename: Luca
authors.initials: L
authors.lastname: Bergamini
authors.affiliation: CIC nanoGUNE , E-20018 Donostia-San Sebastian, Spain.
authors.forename: Matteo
authors.initials: M
authors.lastname: Pancaldi
authors.affiliation: Materials Physics Center CSIC-UPV/EHU and Donostia International Physics Center, DIPC , E-20018 Donostia-San Sebastian, Spain.
authors.forename: Mikolaj K
authors.initials: MK
authors.lastname: Schmidt
authors.affiliation: NanoSpin, Department of Applied Physics, Aalto University School of Science , FI-00076 Aalto, Finland.
authors.forename: Mikko
authors.initials: M
authors.lastname: Kataja
authors.affiliation: NanoSpin, Department of Applied Physics, Aalto University School of Science , FI-00076 Aalto, Finland.
authors.forename: Sebastiaan van
authors.initials: Sv
authors.lastname: Dijken
authors.affiliation: Department of Electricity and Electronics, Faculty of Science and Technology, UPV/EHU , E-48080 Bilbao, Spain.|Materials Physics Center CSIC-UPV/EHU and Donostia International Physics Center, DIPC , E-20018 Donostia-San Sebastian, Spain.
authors.forename: Nerea
authors.initials: N
authors.lastname: Zabala
authors.affiliation: Materials Physics Center CSIC-UPV/EHU and Donostia International Physics Center, DIPC , E-20018 Donostia-San Sebastian, Spain.
authors.forename: Javier
authors.initials: J
authors.lastname: Aizpurua
authors.affiliation: CIC nanoGUNE , E-20018 Donostia-San Sebastian, Spain.|Ikerbasque, Basque Foundation for Science , E-48013 Bilbao, Spain.
authors.forename: Paolo
authors.initials: P
authors.lastname: Vavassori
keywords: Magneto-optical Kerr effect; lattice surface modes; magnetoplasmonics; plasmonic anisotropy