Berlin 2005 – wissenschaftliches Programm

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O: Oberflächenphysik

O 36: Postersitzung (Elektronische Struktur, Grenzfl
äche fest-flüssig, Halbleiteroberfl
ächen und -grenzfl
ächen, Nanostrukturen, Oberfl
ächenreaktionen, Teilchen und Cluster, Struktur und Dynamik reiner Oberfl
ächen)

O 36.36: Poster

Montag, 7. März 2005, 15:00–18:00, Poster TU F

Light scattering by thin planar nanostructures on surfaces — •Manuel Gonçalves and Othmar Marti — University of Ulm - Dept. of Experimental Physics, Albert-Einstein-Allee 11, D-89069 Ulm, Germany

The scattering of light by small metallic structures depends strongly on the dielectric constant of the material and on the geometry. Unlike in dielectric structures the scattered radiation is mainly produced by surface plasmons confined in the metallic structures. These plasmons can be excited by an evanescent wave produced by total-internal-reflection. The intensity and location of the scattering centers have been investigated using a confocal microscope. For some materials the scattering patterns depend strongly on the polarization direction. The location of the scattering centers is also dependent on the geometry of the structures and on their relative orientation relative to the direction of incidence. SNOM images of the same metallic particles and structures obtained in illumination mode do not reveal a particular dependency on the geometry or particle orientation.