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中文摘要：
为了提高全息聚合物分散液晶光栅的衍射效率并降低其驱动电压,改善光栅的电光特性,研究了表面平行摩擦取向对全息聚合物分散液晶光栅电光特性的影响.理论分析认为,改善相分离结构和降低液晶微滴之间的有序度差异是优化光栅电光特性的根本所在.由于进行表面取向处理后的液晶和单体之间达到扩散匹配,使得相分离的程度大幅提高,在衍射能力增强的同时驱动电压也实现了大幅下降,而且,表面取向作用也使光栅内的液晶分子均匀排列,降低了液晶微滴之间的有序度差异,从而减少了光栅的散射损失.实验结果表明：进行取向处理后的光栅其衍射效率由传统光栅的75.6%提高到了98.1%,驱动电压也由9.2V/μm降到了4.8V/μm,而且只有在表面摩擦强度适中的条件下,形成的全息聚合物分散液晶光栅才具有高衍射效率、低动电压等良好的电光特性.
英文摘要：
In order to obtain holographic polymer dispersed liquid crystal（HPDLC） grating with high diffraction efficiency and low threshold,the effect of parallel rubbing alignment on electro-optical properties of HPDLC grating is investigated.According to the theoretical analysis,the improvement of phase separation structure and the lower order difference of the liquid crystal droplets are essential for perfect electro-optical properties of the grating.The phase separation is significantly improved due to the diffusion match between monomers and liquid crystals in the case of parallel alignment treatment.So the diffraction capability is enhanced while the driven voltage is reduced obviously.Moreover,the order difference of liquid crystal droplets is reduced because of the uniform liquid crystal alignments and consequently the scattering loss is reduced greatly.Experimental results indicate that the diffraction efficiency of grating with rubbing alignment increases from 75.6%（traditional HPDLC grating） to 98.1% and the driving voltage is lowered from 9.2 V /μm to 4.8 V /μm.And also,only in the case of certain surface rubbing strength,the HPDLC with high diffraction efficiency and low threshold will be realized.
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