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O: Oberflächenphysik

O 28: Postersitzung (Elektronische Struktur, Grenzfläche fest-flüssig, Halbleiteroberflächen und -grenzflächen, Magnetismus und Symposium SYXM, Methodisches, Nanostrukturen, Oberflächenreaktionen, Teilchen und Cluster, Zeitaufgelöste Spektroskopie)

O 28.46: Poster

Mittwoch, 10. März 2004, 16:00–19:00, Bereich C

Dependency of the scattering of light by small planar particles on the direction of incidence and polarization — •Manuel Gonçalves and Othmar Marti — Department of Experimental Physics, University of Ulm, D-89069 Ulm, Germany

The scattering of light by small particles has been intensively researched in the last decades. The well known dependencies of the scattering of light on the size, shape, material and environment of the particles reveals the complexity of the problem. Several publications have shown numerical simulations and experimental results demonstrating resonances and local field-enhancements on sub-wavelength particles.

Particles of size comparable to the wavelength and of sub-wavelength size, of planar geometry i.e. where the thickness is much smaller than their linear dimensions, are of great interest in photonics.

We have investigated planar particles of different shapes by confocal and SNOM microscopy. These particles show interesting dependencies on the direction of the incidence of light, on polarization and on the dielectric constant of the material.

We have observed important differences in the scattering patterns for each material, and each relative orientation of the particles with the direction of incidence of the light.