Regensburg 2007 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 20: POSTER: Biological Systems + New Materials

CPP 20.9: Poster

Wednesday, March 28, 2007, 16:00–18:30, Poster B

Azo-dye/ polymer composite - a novel class of materials for optical coatings — Sven Macko, •Rafael Meinhardt, Ansgar Draude, and Hilmar Franke — Department of applied physics, university of Duisburg-Essen, Lotharstr.1, 47057 Duisburg, Germany

Polymer films of dipolar and nondipolar materials with a thickness up to 1-2 microns have been prepared on glass substrates. Vapor deposition of azo-dyes (< 500 nm) and subsequent annealing leads to composite layers which are different from usual solution prepared guest-host systems. These composite layers can be prepared with high dye concentrations. Absorption spectra and metal film enhanced leaky mode spectroscopy have been applied prior and after the deposition of the dye layers. A strong interdiffusion has been observed. The obtained composite material is quite different from the well known guest-host systems.

Regarding their optical properties the composites behave more like organic glasses than guest-host systems. In comparison with the pure polycrystalline layers the scattering can be reduced with the composites and smooth surfaces may be obtained. Stable and efficient holographic gratings could be recorded in these layers.