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Proceedings Paper

Spectroscopic investigation of laser-induced processes in a series of azobenzene-containing side-chain polymers
Author(s): Geminiano Martinez-Ponce; Tsveta Petrova; Natalia Tomova; Violeta Dragostinova; Todor Todorov; Ludmila Nikolova
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Paper Abstract

We investigate the photoinduced processes in films of a series of three side-chain azobenzene-containing polymers, which differ only in the length of the spacers attaching the chromophores to the main chain. Two of them are amorphous and one is liquid-crystalline. Illumination of the polymer films with an Ar-laser beam results in changes in their absorption spectra and to the appearance of dichroism. In the polymer with shortest spacers the irradiation gives rise to a considerable photoequilibrium concentration of cis-azobenzenes resulting from the photoinduced reversible trans-cis isomerization. In the polymer with long spacers, which is liquid-crystalline, the main result from the irradiation is the reorientation of the trans-azobenzenes and the photodichroism in this film is much larger. The induced dichroism is stable in this liquid-crystalline film; it disappears with time in the amorphous films.

Paper Details

Date Published: 21 June 2004
PDF: 5 pages
Proc. SPIE 5449, Eighth International Conference on Laser and Laser Information Technologies, (21 June 2004); doi: 10.1117/12.563089
Show Author Affiliations
Geminiano Martinez-Ponce, Central Lab. of Optical Storage and Processing of Information (Bulgaria)
Tsveta Petrova, Central Lab. of Optical Storage and Processing of Information (Bulgaria)
Natalia Tomova, Central Lab. of Optical Storage and Processing of Information (Bulgaria)
Violeta Dragostinova, Central Lab. of Optical Storage and Processing of Information (Bulgaria)
Todor Todorov, Central Lab. of Optical Storage and Processing of Information (Bulgaria)
Ludmila Nikolova, Central Lab. of Optical Storage and Processing of Information (Bulgaria)


Published in SPIE Proceedings Vol. 5449:
Eighth International Conference on Laser and Laser Information Technologies

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