7 October 2014 Molecular dynamics in azobenzene liquid crystal polymer films studied by transient grating technique
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Abstract
We studied the effect of the ratio between the monomer and cross-linker molecules in the azobenene included liquid crystal polymer films by using the heterodyne transient grating (HD-TG) technique, which is one of the time-resolved measurement techniques. Depending on the ratio, the magnitude of the refractive index change, its anisotropy, and the lifetime of the cis isomer of azobenzene, generated by a UV pulse irradiation. By increasing the cross-linker ratio, the refractive index change and its anisotropy was reduced, indicating less ability for the motion, while slower lifetime was observed by increasing the monomer ratio, indicating that the film is difficult to return the original shape by a visiblelight irradiation. The obtained dynamics was consistent with the functionality of the films.
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Kenji Katayama, Tomomi Fujii, Shota Kuwahara, Kiyohide Takado, Tomiki Ikeda, "Molecular dynamics in azobenzene liquid crystal polymer films studied by transient grating technique", Proc. SPIE 9182, Liquid Crystals XVIII, 918209 (7 October 2014); doi: 10.1117/12.2059740; https://doi.org/10.1117/12.2059740
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