Berlin 2012 – scientific programme

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O: Fachverband Oberflächenphysik

O 74: Plasmonics and nanooptics IV

O 74.7: Talk

Thursday, March 29, 2012, 17:30–17:45, MA 005

Transmission of Light through Magnetic Nanocavities — •Piotr Patoka, Michael Hilgendorff, and Michael Giersig — Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin

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.