Spectroscopic investigation of laser-induced processes in a series of azobenzene-containing side-chain polymers

Geminiano Martinez-Ponce; Tsveta Petrova; Natalia Tomova; Violeta Dragostinova; Todor Todorov; Ludmila Nikolova

doi:10.1117/12.563089

21 June 2004 Spectroscopic investigation of laser-induced processes in a series of azobenzene-containing side-chain polymers

Geminiano Martinez-Ponce, Tsveta Petrova, Natalia Tomova, Violeta Dragostinova, Todor Todorov, Ludmila Nikolova

Author Affiliations +

Proceedings Volume 5449, Eighth International Conference on Laser and Laser Information Technologies; (2004) https://doi.org/10.1117/12.563089
Event: Eighth International Conference on Laser and Laser Information Technologies, 2003, Smolyan, Bulgaria

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.

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Geminiano Martinez-Ponce, Tsveta Petrova, Natalia Tomova, Violeta Dragostinova, Todor Todorov, and Ludmila Nikolova "Spectroscopic investigation of laser-induced processes in a series of azobenzene-containing side-chain polymers", Proc. SPIE 5449, Eighth International Conference on Laser and Laser Information Technologies, (21 June 2004); https://doi.org/10.1117/12.563089

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