LICRYL (Liquid Crystals Laboratory, Institute for Chemical Physics Processes-CNR), Centre of Excellence for the Study of Innovative Functional Materials and Department of Physics, University of Calabria, 87036 Arcavacata di Rende, Italy.
Opt Lett. 2010 Aug 15;35(16):2759-61. doi: 10.1364/OL.35.002759.
We report on the realization of a 2D refractive structure consisting of a polymer-liquid-crystal polymer slice grid. Nematic liquid crystal microdomains are confined inside well-sculptured elliptical cavities; experimental investigation shows that the liquid crystal director lies in the plane of the structure and its orientation follows a preferred direction. The sample exhibits both an electro-optical and an all-optical response owing to a small percentage of photosensitive azo dye included in the structure. A double external control of the two-dimensional grating efficiency can indeed be operated either by an optical pump beam or by the standard technique of applying a suitable external voltage to the sample.
我们报告了一种由聚合物-液晶聚合物片栅组成的二维折射结构的实现。向列液晶微畴被限制在精心制作的椭圆形腔内；实验研究表明，液晶指向矢位于结构平面内，其取向遵循一个优选方向。由于结构中包含少量光敏偶氮染料，因此该样品具有电光和全光响应。通过光学泵浦光束或通过向样品施加适当外部电压的标准技术，可以对二维光栅效率进行双重外部控制。
