Photoisomerization of Azo-Dyes in Nematic Liquid Crystals

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Abstract
The photoisomerization of azo dyes in nematic liquid crystals is investigated. Using a pump-probe technique, the absorption coefficients of the trans and cis isomers are evaluated separately and the dye order parameters of both forms are determined. It is shown that as a consequence of the difference of the trans and cis orientational order, the trans-cis equilibrium can be controlled through the polarization direction of the pump beam.

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