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Stark effect was applied to the evaluation of asymmetrical molecular orientation in second-order non1inear optical materials: an asymmetrical Langmuir-Blodgett (LB) film and a poled polymer film. In t...he case of the asymmetrical LB film, molecular orientation in three types of LB films, which were fabricated with hetero Y-type, Z-type and Y-type deposition, was determined from the analysis of the Stark effect spectra. Molecules in the hetero Y-type film was proved to align asymmetrically. However, molecular orientation in the Z-type film possessed very small asymmetry; the order parameter of the Z-the film was almost equal to that of the symmetric Y-type film. In the poled polymer film, we have succeeded in the in situ evaluation of molecular orientation behavior under poling field and relaxation behavior of the molecular orientation after the poling field was removed. Above Tg, polar molecules doped in a polymer film behaved as a noninteracting solution under the influence of poling field. The relaxation of the polar orientation in the absence of the poling field was observed even below Tg.続きを見る
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