Zhou Jian, Collard David M, Srinivasarao Mohan
School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332, USA.
Opt Lett. 2006 Mar 1;31(5):652-4. doi: 10.1364/ol.31.000652.
Spatially periodic patterning of the anchoring condition of a nematic liquid crystal (NLC) within a polymer matrix via a patterned photopolymerization affords a novel and facile method to prepare electrically switchable diffraction gratings. UV irradiation through a photomask of two comonomers, with opposite tendencies to align the NLC and also with different reactivity ratios, leads to definition of areas with either homeotropic or planar alignment of the NLC. Photopolymerization-induced diffusion of the monomers accounts for the spatial distribution of the concentration of these monomers. The resulting diffraction gratings are switchable under low electric fields and possess structural stability offered by the polymer matrix.
通过图案化光聚合作用在聚合物基质内对向列型液晶（NLC）的锚定条件进行空间周期性图案化，提供了一种新颖且简便的方法来制备电可切换衍射光栅。通过具有使NLC排列方向相反且反应活性比不同的两种共聚单体的光掩膜进行紫外线照射，可确定NLC呈垂直排列或平面排列的区域。单体的光聚合诱导扩散决定了这些单体浓度的空间分布。所得的衍射光栅在低电场下可切换，并且具有聚合物基质提供的结构稳定性。
