Optical characterization of thin layers of an azo di-block copolymer

S. Macko; Rafael Meinhardt; Ansgar Draude; Yue Zhao; Hilmar Franke

doi:10.1117/12.778926

30 October 2007 Optical characterization of thin layers of an azo di-block copolymer

S. Macko, Rafael Meinhardt, Ansgar Draude, Yue Zhao, Hilmar Franke

Proceedings Volume 6796, Photonics North 2007; 67961L (2007) https://doi.org/10.1117/12.778926
Event: Photonics North 2007, 2007, Ottawa, Canada

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.

Citation Download Citation

S. Macko, Rafael Meinhardt, Ansgar Draude, Yue Zhao, and Hilmar Franke "Optical characterization of thin layers of an azo di-block copolymer", Proc. SPIE 6796, Photonics North 2007, 67961L (30 October 2007); https://doi.org/10.1117/12.778926

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