全息聚合物弥散液晶材料衍射特性的优化

Optimization of diffraction properties for holographic polymer dispersed liquid crystal

研究了影响全息聚合物弥散液晶 (HPDLC)衍射效率的主要因素 ,分析了衍射效率与聚合物单体的选择、曝光强度、曝光时间、液晶含量及温度的依赖关系 ,从而找到最佳条件 ,使衍射特性得到优化 .目前测得的最大衍射效率为 80 2 % .实验中还研究了扫描电镜 (SEM)

Holographic polymer-dispersed liquid crystal. (HPDLC) is a kind of switchable volume holography. It can be manufactured according to the photo-initiated polymerization-induced phase separation. HPDLC is composed of parallel, periodic polymer-rich and liquid crystal-rich planes. The diffraction efficiency can be modulated by the application of electric field. HPDLC devices are potentially useful for optical communication, information storage and display. How to increase the diffraction efficiency is the key to application. We investigated the dependence of diffraction efficiency on the refractive index of the polymer, exposure intensity, liquid crystal loading and temperature. The best conditions were found to make the diffraction properties optimized. Now the highest diffraction efficiency was 80.2%. The HPDLC morphologies were also observed and analyzed by scanning electron microscope (SEM).