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Thermoassisted Photorecording in Chiral Smectic Azodye Copolymers

Published online by Cambridge University Press:  15 March 2011

Mikhail V. Kozlovsky ,
Wolfgang Haase  and
Matthias Rehahn
Mikhail V. Kozlovsky
Affiliation:
Inst. of Physical Chemistry, Darmstadt University of Technology, Petersenstr. 20, 64287 Darmstadt, Germany
Wolfgang Haase
Affiliation:
Inst. of Physical Chemistry, Darmstadt University of Technology, Petersenstr. 20, 64287 Darmstadt, Germany
Matthias Rehahn
Affiliation:
German Plastics Institute, Schlossgartenstrasse 6, 64289 Darmstadt, Germany
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Abstract

Illumination of photochromic liquid-crystalline (PCLC) copolymer films with polarized light during the mesophase formation has been studied. Both thick pressed and thin spin-coated, the films show prominent increase in photoinduced orientation, as compared with conventional isothermal photorecording. Two methods of the thermoassisted recording have been suggested, one of those with simultaneous cooling of the film and another one after a shock heating and quenching. The photoinduced birefringence, Δnind, and the order parameter of photochromic groups, Sazo, have been measured. The thermally assisted recording produces holographic gratings with high diffraction efficiency, η, up to 20-30%.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 709: Symposium CC – Advances in Liquid Crystalline Materials and Technologies , 2001 , CC1.8.1
Copyright
Copyright © Materials Research Society 2002

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References

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