Dresden 2006 – wissenschaftliches Programm

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O: Oberflächenphysik

O 29: Poster session II (Nanostructures, Magnetism, Particles and clusters, Scanning probe techniques, Time-resolved spectroscopy, Structure and dynamics, Semiconductor surfaces and interfaces, Oxides and insulators, Solid-liquid interfaces)

O 29.15: Poster

Mittwoch, 29. März 2006, 14:30–17:30, P2

Optical Effects of Surface Plasmons Confinement in Planar Nanoparticles — •Manuel Gonçalves, André Siegel, and Othmar Marti — Department of Exp. Physics, University of Ulm, D-89069 Ulm, Germany

The scattering of light by metallic nanoparticles and nanostructures is intimately related with the surface plasmon-polaritons (SPP). Material, shape and size of the particles influence the confinement of the SPPs and their resonances. When the k-vector of the SPPs and the k-vector of light match a radiative process occurs. Small particles of the size of the wavelength, with sharp corners and edges, generate scattered waves with large k-vector and, therefore, are appropriate to study the scattering of light by SPPs.

We have investigated arrays of planar metallic particles of triangular shape, with different thicknesses and of different materials. The optical far-field characterization was done using a Total-Internal-Reflection illumination setup and a confocal microscope. The near-field was investigated using a SNOM microscope in illumination mode. It was observed that the scattering of laser light is strongly dependent on the material of the particle, on its orientation and on the polarization of light. We present an overview of the optical effects observed.