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Light localization and magneto-optic enhancement in Ni antidot arrays

AuthorsRollinger, Markus; Thielen, Philip; Melander, Emil; Östman, Erik; Kapaklis, Vassilios; Obry, Björn; Cinchetti, Mirko; García-Martín, Antonio ; Aeschlimann, Martin; Papaioannou, E. Th.
KeywordsMagnetooptical effects
Collective excitations
Surface plasmons polaritons
Photoemission electron microscopy
Magneto-plasmonic crystals
Issue Date28-Mar-2016
PublisherAmerican Chemical Society
CitationNano Letters 16(4): 2432–2438 (2016)
AbstractWe reveal an explicit strategy to design the magneto-optic response of a magneto-plasmonic crystal by correlating near- and far-fields effects. We use photoemission electron microscopy to map the spatial distribution of the electric near-field on a nanopatterned magnetic surface that supports plasmon polaritons. By using different photon energies and polarization states of the incident light we reveal that the electric near-field is either concentrated in spots forming a hexagonal lattice with the same symmetry as the Ni nanopattern or in stripes oriented along the Γ−K direction of the lattice and perpendicular to the polarization direction. We show that the polarization-dependent near-field enhancement on the patterned surface is directly correlated to both the excitation of surface plasmon polaritons on the patterned surface as well as the enhancement of the polar magneto-optical Kerr effect. We obtain a relationship between the size of the enhanced magnetooptical behavior and the polarization and wavelength of optical excitation. The engineering of the magneto-optic response based on the plasmon-induced modification of the optical properties introduces the concept of a magneto-plasmonic meta-structure.
Publisher version (URL)http://dx.doi.org/10.1021/acs.nanolett.5b05279
Appears in Collections:(IMN-CNM) Artículos
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