Light Localization and Magneto-Optic Enhancement in Ni Antidot Arrays
2016 (English)In: Nano letters (Print), ISSN 1530-6984, E-ISSN 1530-6992, Vol. 16, no 4, 2432-2438 p.Article in journal (Other academic) Published
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 Gamma-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.
Place, publisher, year, edition, pages
2016. Vol. 16, no 4, 2432-2438 p.
Magnetooptical effects; collective excitations; surface plasmons polaritons; photoemission electron microscopy; magneto-plasmonic crystals
Condensed Matter Physics
IdentifiersURN: urn:nbn:se:uu:diva-262659DOI: 10.1021/acs.nanolett.5b05279ISI: 000374274600045PubMedID: 27018661OAI: oai:DiVA.org:uu-262659DiVA: diva2:854743
FunderKnut and Alice Wallenberg FoundationGerman Research Foundation (DFG), SFB/TRR 173German Research Foundation (DFG), DFG/GSC 266