title: Transmission of light through magnetic nanocavities.
abstract: The transmission of light through a metallic film stack on a transparent substrate, perforated with a periodic array of cylindrical holes/nanocavities, is studied. The structure is fabricated by using self-assembled nanosphere lithography. Since one layer in the film stack is made of a ferromagnetic metal (iron), exposure of the structure to a solution containing iron oxide nanoparticles causes nanoparticle accumulation inside the nanocavities. This changes the dielectric constant inside the nanocavities and thus affects the light transmission. Simulations are in good agreement with experiment, and show large sensitivity of the response to the amount of iron oxide nanoparticles deposited. This could be used in various sensor applications.
authors.affiliation: Institut für Experimentalphysik, Freie University Berlin, Arnimalle 14, 14195 Berlin, Germany.
authors.forename: Piotr
authors.initials: P
authors.lastname: Patoka
authors.forename: Tomas
authors.initials: T
authors.lastname: Skeren
authors.forename: Michael
authors.initials: M
authors.lastname: Hilgendorff
authors.forename: Linjie
authors.initials: L
authors.lastname: Zhi
authors.forename: Trilochan
authors.initials: T
authors.lastname: Paudel
authors.forename: Krzysztof
authors.initials: K
authors.lastname: Kempa
authors.forename: Michael
authors.initials: M
authors.lastname: Giersig
mesh_terms: D005290:Ferric Compounds / Q000737:chemistry*; D008027:Light; D008280:Magnetics; D053768:Metal Nanoparticles / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D020349:Surface Plasmon Resonance
chemical_list: D005290:Ferric Compounds; C000499:ferric oxide