Dresden 2011 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 11: Plasmonics and Nanooptics I
O 11.5: Vortrag
Montag, 14. März 2011, 16:00–16:15, PHY C213
Experimental observation of decoupled plasmon resonances in metallic nanoparticles — •Reto Giannini1, Yasin Ekinci1,2, and Jörg F. Löffler1 — 1Laboratory of Metal Physics and Technology, Department of Materials, ETH Zurich, 8093 Zurich, Switzerland — 2Laboratory for Micro and Nanotechnology, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland
The optical response of designed metallic nanostructures is of high interest due to its importance in sensing applications, nanoantennas and nanooptics. With the aim to analyze the optical response of metallic nanostructures in the visible wavelength range, we produced metallic nanoparticles with the simple geometry of cylinders standing on a glass substrate by e-beam lithography. Additionally, a measurement set-up was established that allows the directional excitation of nanoparticles in three dimensions. Based on the analysis of the nanocylinders, we show experimental evidence that the overall optical response of such a system is the superposition of individually tunable plasmon resonances, i.e. normal modes. In the case of the cylinder, three normal modes associated with the main axes and therefore excitable by a polarization along these axes have been observed. Finally, these results are compared with FEM-based simulations.