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Proceedings Paper

Optical characterization of thin layers of an azo di-block copolymer
Author(s): S. Macko; Rafael Meinhardt; Ansgar Draude; Yue Zhao; Hilmar Franke
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Paper Abstract

A di-block copolymer composed of poly(ethylene oxide) and poly(azobenzene methacrylate) in the ratio of 45:55 has been synthesized. Thin films of about 400-700nm thickness have been prepared from solutions in trichloromethane by gravity settling. ATR-leaky mode spectroscopy has been used for the determination of the optical anisotropy. Homogeneous exposure caused a significant change in this anisotropy. Holographic gratings have been recorded in these films. The in-situ measurements of the diffraction efficiency exhibit a relative maximum after a recording time of about 30 min, followed by a relative minimum before increasing again to high values of up to 40%. Especially for circular polarization high efficiencies were obtained. Depositing this film on a foil of polyethylene the grating constant of a recorded grating could be tuned by the application of mechanical stress in a testing machine.

Paper Details

Date Published: 30 October 2007
PDF: 9 pages
Proc. SPIE 6796, Photonics North 2007, 67961L (30 October 2007); doi: 10.1117/12.778926
Show Author Affiliations
S. Macko, Univ. of Duisburg-Essen (Germany)
Rafael Meinhardt, Univ. of Duisburg-Essen (Germany)
Ansgar Draude, Univ. of Duisburg-Essen (Germany)
Yue Zhao, Univ. de Sherbrooke (Canada)
Hilmar Franke, Univ. of Duisburg-Essen (Germany)


Published in SPIE Proceedings Vol. 6796:
Photonics North 2007

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