摘要：

Important factors controlling a polarized-light induced orientation of azo-dyes in a polymer matrix were studied by polarized spectroscopies, i.e., polarized FT-IR, polarized UV-vis, and surface plasmon spectroscopy. In polymer matrices dispersing azo-dyes, polar groups or free volume in polymers were found to contribute to the isomerization process of azo-molecules and the photoinduced anistropy ratio by the evaluation of orientation factors. In the polymer linked with an azo-dye, higher orientation was observed. This is due to the suppression of the rotational diffusion by linkage with a polymer chain, which causes gradual reorientation during frequent trans-cis-trans isomerization cycles. In thin polymer films, the reorientation was observed in the direction normal to the film plane.

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