title: Light Localization and Magneto-Optic Enhancement in Ni Antidot Arrays.
abstract: We 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 magneto-optical 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.
authors.affiliation: Fachbereich Physik and Forschungszentrum OPTIMAS, Technische Universität Kaiserslautern , 67663 Kaiserslautern, Germany.
authors.forename: Markus
authors.initials: M
authors.lastname: Rollinger
authors.affiliation: Fachbereich Physik and Forschungszentrum OPTIMAS, Technische Universität Kaiserslautern , 67663 Kaiserslautern, Germany.|Graduate School of Excellence Materials Science in Mainz , Gottlieb-Daimler-Strasse 47, 67663 Kaiserslautern, Germany.
authors.forename: Philip
authors.initials: P
authors.lastname: Thielen
authors.affiliation: Department of Physics and Astronomy, Uppsala University , Box 516, SE-75120, Uppsala, Sweden.
authors.forename: Emil
authors.initials: E
authors.lastname: Melander
authors.affiliation: Department of Physics and Astronomy, Uppsala University , Box 516, SE-75120, Uppsala, Sweden.
authors.forename: Erik
authors.initials: E
authors.lastname: Östman
authors.affiliation: Department of Physics and Astronomy, Uppsala University , Box 516, SE-75120, Uppsala, Sweden.
authors.forename: Vassilios
authors.initials: V
authors.lastname: Kapaklis
authors.affiliation: Fachbereich Physik and Forschungszentrum OPTIMAS, Technische Universität Kaiserslautern , 67663 Kaiserslautern, Germany.
authors.forename: Björn
authors.initials: B
authors.lastname: Obry
authors.affiliation: Fachbereich Physik and Forschungszentrum OPTIMAS, Technische Universität Kaiserslautern , 67663 Kaiserslautern, Germany.
authors.forename: Mirko
authors.initials: M
authors.lastname: Cinchetti
authors.affiliation: IMM-Instituto de Microelectronica de Madrid (CNM-CSIC) , Isaac Newton 8, PTM, Tres Cantos, E-28760 Madrid, Spain.
authors.forename: Antonio
authors.initials: A
authors.lastname: García-Martín
authors.affiliation: Fachbereich Physik and Forschungszentrum OPTIMAS, Technische Universität Kaiserslautern , 67663 Kaiserslautern, Germany.
authors.forename: Martin
authors.initials: M
authors.lastname: Aeschlimann
authors.affiliation: Fachbereich Physik and Forschungszentrum OPTIMAS, Technische Universität Kaiserslautern , 67663 Kaiserslautern, Germany.
authors.forename: Evangelos Th
authors.initials: ET
authors.lastname: Papaioannou
keywords: Magnetooptical effects; collective excitations; magneto-plasmonic crystals; photoemission electron microscopy; surface plasmons polaritons