Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, 373-1, Guseong-dong, Yuseong-gu, Daejeon, 305-701, Korea.
Opt Lett. 2010 Sep 15;35(18):3141-3. doi: 10.1364/OL.35.003141.
The micropatterned poly(vinyl cinnamate) (PVCi) alignment layers are fabricated by a solvent-assisted micromolding method. Without UV irradiation, the alignment layer can induce the unidirectional liquid crystal (LC) orientation, which is influenced by topography-based anchoring energies. With photodimerization of PVCi by UV irradiation, we could modulate the anchoring energies caused by chemical interactions of the alignment layer. It is observed that these two different contributions compete against each other in determining LC rotation on the surface of the alignment layer. The rotation angle of LC directors could be controlled from 45° to 70° by simply changing the UV exposure dose.
微图案聚（肉桂酸乙烯酯）（PVCi）取向层通过溶剂辅助微成型方法制造。未经紫外光照射，该取向层可以诱导各向异性液晶（LC）取向，这受到基于形貌的锚定能的影响。通过紫外光使 PVCi 光二聚化，我们可以调节由取向层的化学相互作用引起的锚定能。可以观察到，在确定 LC 在取向层表面的旋转方面，这两种不同的贡献相互竞争。通过简单地改变紫外光曝光剂量，可以将 LC 取向的旋转角度从 45°控制到 70°。
