Blanche P A, Lemaire P C, Dumont M, Fischer M
Opt Lett. 1999 Oct 1;24(19):1349-51. doi: 10.1364/ol.24.001349.
Photoinduced dichroism in various polymers containing the same azo dye has been studied. "Angular hole burning" and molecular reorientation have been identified by analysis of dichroism dynamics at various probe wavelengths. The glass-transition temperature T(g) is of major relevance for the reorientation of optically active molecules. For low T(g) (below ambient temperature) thermal diffusion impedes anisotropy buildup. For higher T(g) the angular distribution induced by the polarized pump beam is frozen. We propose a simple model based on diffusion rates in trans and cis molecules.
对含有相同偶氮染料的各种聚合物中的光致二色性进行了研究。通过分析不同探测波长下的二色性动力学，确定了“角烧孔”和分子重排。玻璃化转变温度T(g)对旋光分子的重排具有重要意义。对于低T(g)（低于环境温度），热扩散会阻碍各向异性的形成。对于较高的T(g)，偏振泵浦光束诱导的角分布会被冻结。我们基于反式和顺式分子中的扩散速率提出了一个简单模型。
