Holographic studies on block copolymers

Michael Haeckel; Lothar Kador; Carsten Frenz; Hans-Werner Schmidt

doi:10.1117/12.563819

26 October 2004 Holographic studies on block copolymers

Michael Haeckel, Lothar Kador, Carsten Frenz, Hans-Werner Schmidt

Proceedings Volume 5521, Organic Holographic Materials and Applications II; (2004) https://doi.org/10.1117/12.563819
Event: Optical Science and Technology, the SPIE 49th Annual Meeting, 2004, Denver, Colorado, United States

Abstract

The optically induced birefringence in different azobenzene and mesogen containing block copolymers has been studied with holographic methods as well as with measurements between crossed polarizers. The influence of various parameters for possible applications as holographic data storage materials was investigated. In the block copolymers, the functionalized blocks are confined in a matrix of polystyrene. This has the advantage that no surface relief gratings appear when the chromophores are reoriented. Also liquid-crystalline stabilization due to cooperative reorientation occurs inside the functionalized blocks. These short-distance interactions in the blocks give rise to long-term stability of the inscribed gratings. So far injection-molded blends with azobenzene containing block copolymers were capable to store up to 200 holograms on one spot. On such a sample we could also demonstrate a fundamental physical effect which generally plays a role for light diffraction on thick gratings. According to the Kramers-Kronig relations, an attenuation of light is always coupled with a phase shift. In the case of a thick holographic grating, the intensity of the transmitted wave (of diffraction order zero) is a function of the angle of incidence, because part the light is diffracted into the first order when the Bragg condition is fulfilled. We measured the phase shift of the transmitted wave as function of the Bragg mismatch angle and found good agreement with analytical calculations.

Citation Download Citation

Michael Haeckel, Lothar Kador, Carsten Frenz, and Hans-Werner Schmidt "Holographic studies on block copolymers", Proc. SPIE 5521, Organic Holographic Materials and Applications II, (26 October 2004); https://doi.org/10.1117/12.563819

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