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CPP: Chemische Physik und Polymerphysik

CPP 25: POSTER Electronic Structure and Spectroscopy

CPP 25.17: Poster

Thursday, March 30, 2006, 17:00–19:00, P2

Holographic Information Storage in Azobenzene-Containing Diblock Copolymers — •Michael Häckel¹, Lothar Kador¹, Daniela Kropp², Carsten Frenz², Roland Walker², Anja Greß², Klaus Kreger², and Hans-Werner Schmidt² — ¹Institute of Physics and BIMF, University of Bayreuth, 95440 Bayreuth, Germany — ²Macromolecular Chemistry I and BIMF, University of Bayreuth, 95440 Bayreuth, Germany

The optically induced birefringence in different azobenzene- and mesogen-containing block copolymers has been studied with holographic methods. In the block copolymers, the light-sensitive blocks containing the azobenzene moieties are embedded in a matrix of polystyrene. Angular multiplexing of holographic plane-wave gratings as well as of two-dimensional images has been performed in samples with thicknesses up to 1.1 mm. The achievable refractive-index modulation, the photo-sensitivity, and the stability of the inscribed gratings were compared for different materials. In contrast to photopolymers, our materials do not exhibit shrinkage upon illumination. Instead a weak light-induced volume expansion was detected and studied in detail.