Regensburg 2010 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 53: Plasmonics and Nanooptics IV
O 53.11: Vortrag
Mittwoch, 24. März 2010, 17:30–17:45, H32
Polarization dependence of the optical response of individual metallic nanostructures and arrays — •Reto Giannini1, Yasin Ekinci1,2, and Jörg F. Löffler1 — 1Laboratory of Metal Physics and Technology, Department of Materials, ETH Zurich, 8093 Zurich, Switzerland — 2Laboratory of Micro and Nanotechnology, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland
The optical response of designed metallic nanostructures depends strongly on the properties of the exciting light beam, and especially on the polarization relative to the characteristic axis of the nanostructures. To address this dependence, we established an experimental setup in the visible wavelength range that allows us to measure the optical response of individual metallic nanostructures and arrays with varying incident wave vectors and polarization. The possible excitation covers the whole range from normal excitation (relative to the surface of the substrate) to parallel excitation. The latter is realized using objective-based TIRF. In this presentation, we explain the principle of our setup and the optical response of various Au-nanostructures, such as pillars and dimers under varying wave vectors and polarization.