Hidden photoalignment of liquid crystals in the isotropic phase.
Hidden photoalignment of liquid crystals in the isotropic phase.
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各向同性相中液晶的隐藏光取向。
DOI：
10.1103/physreve.63.021701
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
F. Simoni
中科院分区：
文献类型：
--
作者：
E. Ouskova;D. Fedorenko;Y. Reznikov;S. Shiyanovskii;L. Su;J. West;O. Kuksenok;O. Francescangeli;F. Simoni
我们发现了一个隐藏的光致取向的染料掺杂的液晶（LC）的非光敏聚合物表面后，在各向同性相的细胞偏振照射的效果。我们观察到，照射导致在一个均匀的平面取向的LC冷却后的中间相。聚合物上的光诱导易轴的方向可以平行于或垂直于入射光的偏振，这取决于光强度。我们将这种行为归因于两种光致取向机制：光诱导染料分子在基底上的吸附，以及在先前吸附的染料层中的各向异性解吸。对染料薄膜上液晶光取向的实验结果证实了我们的模型。
We found the effect of a hidden photoalignment of a dye-doped nematic liquid crystal (LC) on a nonphotosensitive polymer surface after polarized irradiation of the cell in the isotropic phase. We observed that irradiation resulted in a uniform planar orientation of the LC after cooling to the mesophase. The direction of a light-induced easy axis on the polymer can be either parallel or perpendicular to the polarization of the incident light, depending on the light intensity. We attribute this behavior to two mechanisms of photoalignment: light-induced adsorption of dye molecules on the substrate, and anisotropic desorption in a previously adsorbed dye layer. The experimental results on photoalignment of a LC on a thin dye film confirm our model.