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In-Situ Observation of Thermal Amplification of Photogenerated Optical Anisotropy of Films of Azobenzene Polymers

Published online by Cambridge University Press:  10 February 2011

Masatoshi Kidowaki ,
Takenori Fujiwara ,
Shin'ya Morino ,
Kunihiro Ichimura  and
Joachim Stumpe
Masatoshi Kidowaki
Affiliation:
Tokyo Institute of Technology, Research Laboratory and Resources Utilization, Yokohama, JAPAN, [email protected]
Takenori Fujiwara
Affiliation:
Tokyo Institute of Technology, Research Laboratory and Resources Utilization, Yokohama, JAPAN, [email protected]
Shin'ya Morino
Affiliation:
Tokyo Institute of Technology, Research Laboratory and Resources Utilization, Yokohama, JAPAN, [email protected]
Kunihiro Ichimura
Affiliation:
Tokyo Institute of Technology, Research Laboratory and Resources Utilization, Yokohama, JAPAN, [email protected]
Joachim Stumpe
Affiliation:
Institute for Thin Film Technology and Microsensorics, Erieseering 42, 10319 Berlin, Germany
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Abstract

Thin films of polymers containing p-cyanoazobenzene side chains were studied to reveal its applicability for optical storage media, surface grating optics and aligning films for liquid crystal (LC) display devices. We followed the generation of optical anisotropy of LPLirradiated films of three polymethacrylates with azobenzene side chains exhibiting amorphous, crystalline and liquid-crystalline natures during heat treatment by mean of an ellipsometry and polarized UV-visible spectroscopy. Whereas photogenerated optical anisotropy of amorphous polymer films disappeared above glass transition temperature, the photo-induced anisotropy of films of liquid crystalline and crystalline polymer films was significantly amplified by heat treatment. In case of crystalline polymers amplified optical anisotropy was maintained even at 300°C whereas partial decomposition was observed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 559: Symposium D – Liquid Crystals Materials and Devices , 1999 , 141
Copyright
Copyright © Materials Research Society 1999

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References

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