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O: Fachverband Oberflächenphysik

O 17: Poster Session I (Nanostructures at Surfaces; Metal Substrates: Epitaxy and Growth; Methods: Scanning Probe Techniques; Phase Transitions)

O 17.12: Poster

Montag, 26. März 2007, 17:30–20:30, Poster C

Investigation of plasmon resonances and Bragg diffraction properties of metallic nanostructures — •André Siegel, Manuel Rodrigues Gonçalves, Ralf Ameling, and Othmar Marti — University of Ulm, Institute of Experimental Physics, Albert-Einstein-Allee 11, D-89069 Ulm, Germany

The excitation of surface plasmon polaritons (SPP) at metallic nanoparticles using total internal illumination and the associated local field enhancement are of special importance for surface enhanced Raman scattering. In order to understand the coupling of light with SPPs in nanoparticles of complex shape, it is important to investigate the scattering of light by these particles.

Therefore, we have built a setup to measure the scattering of light of arrays of identical nanoparticles. We found, that the diffraction patterns – besides their dependency on size, lattice constant and material – are very sensitive to the shape of the particles. The results are compared to models of Bragg diffraction using different form factors.

Moreover, by varying the angle of illumination, it is possible to measure the dispersion relation and plasmon resonances of the SPPs for these arrays of nanoparticles.