Surface lattice resonances and magneto-optical response in magnetic nanoparticle arrays

• DOI: 10.1038/ncomms8072
• Publication Date: 2015-05-07T10:57:36Z
• Authors: M. Kataja; T. K. Hakala; A. Julku; M. J. Huttunen; S. van Dijken; P. Törmä
• Keywords: Fano resonance; Lattice (music); Nanophotonics

Abstract Structuring metallic and magnetic materials on subwavelength scales allows for extreme confinement a versatile design of electromagnetic field modes. This may be used, example, to enhance magneto-optical responses, control plasmonic systems using field, or tailor properties individual nanostructures. Here we show that periodic rectangular arrays nanoparticles display surface plasmon modes in which the two directions lattice are coupled by field-controllable spin–orbit coupling nanoparticles. When breaking symmetry lattice, find optical response shows Fano-type resonances whose frequency is determined periodicity orthogonal polarization incident field. In striking contrast, Kerr controlled period parallel direction. The spectral separation longitudinal excitations provides tuning narrow intense resonances.