新型聚合物网络稳定液晶光栅的制备

Preparation of New Type Polymer Network Stabilized Liquid Crystal Grating

将具有光敏特性的预聚物与向列相液晶按一定比例混合,注入液晶盒,以紫外灯为光源,通过光掩模法使混合物在紫外光的引发下产生相分离,形成聚合物网络稳定液晶光栅。采用光学显微镜和He Ne激光器进行测试,结果表明该光栅获得了周期性的栅结构,且衍射效率具有电场调谐性。

Photosensitive pre polymer monomers are mixed together with nematic liquid crystal in certain ratio. Then the mixture is injected into cells. Phase separation between liquid crystal and pre polymer monomers takes place when ultraviolet light is applied by the pattern photomask covering on the cells, which results in the formation of polymer network stabilized liquid crystal grating. The samples are checked up by optical microscope and He Ne laser. The results indicate that the gratings have periodic grating structure and the diffraction efficiencies can be modulated by electric field.