Anisotropic Nanoantenna-Based Magnetoplasmonic Crystals for Highly Enhanced and Tunable Magneto-Optical Activity

Nicolò Maccaferri*, Luca Bergamini, Matteo Pancaldi, Mikolaj K. Schmidt, Mikko Kataja, Sebastiaan Van Dijken, Nerea Zabala, Javier Aizpurua, Paolo Vavassori

*Corresponding author for this work

Research output: Contribution to journalArticle

33 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)2533-2542
Number of pages10
JournalNano Letters
Volume16
Issue number4
DOIs
Publication statusPublished - 13 Apr 2016
Externally publishedYes

Keywords

  • lattice surface modes
  • Magneto-optical Kerr effect
  • magnetoplasmonics
  • plasmonic anisotropy

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