Regensburg 2007 – wissenschaftliches Programm

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DF: Fachverband Dielektrische Festkörper

DF 11: Poster Session

DF 11.29: Poster

Donnerstag, 29. März 2007, 14:30–18:00, Poster C

3D-Laue diffraction of thin micrometer scaled crystals with visible light — •Marcel Roth and Ullrich Pietsch — Institute of solid state physics, University of Siegen, 57072 Siegen, Germany

The interaction of crystals with lattice constants in the micrometer range - such as photonic crystals or colloidal crystals - with visible light shows a plenty of faszinating effects and useful applications. For example light can be strongly manipulated when using quantum optical effects that occur for photonic crystals.

On the other hand the 3D-Laue diffraction of visible light on photonic and colloidal crystals is promising for a selection of various optical wavelengths out of a white beam. This effect is a part of the basic functionality of the human vision.

There is a similarity to the Laue diffraction know for x-rays, but essential differences exit as well. The latter one is due the fact that the refraction index for optical light is far from unity. Therefore simple 1.Born approximation is not valid and one has to consider multiple scattering effects. In this presentation we show first light diffraction experiments from artificial crystals with lattice parameters of about 1 µm. The 3D structure of the crystal is analysed by ω scans and results are interpreted in terms of an extended scattering theory.