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利用几种含不同生色团和具有不同生色团密度的偶氮聚合物刻写了表面起伏光栅(SRGs),研究了偶氮聚合物结构、不同起伏深度、周期和写入偏振态的表面起伏光栅对液晶取向性能的影响.对线偏振p+p干涉激光在BP-AZ-CN膜上刻写的表面起伏光栅,随着表面起伏深度增加,对5CB液晶的取向能力逐渐增强.在BP-AZ-CA和PA-AZ-CA薄膜上刻写的周期为800和1200 nm的光栅,在光栅深度从16~100 nm都能诱导液晶均一取向排列.对起伏深度接近的BP-AZ-CA膜SRGs,周期为800 nm的SRGs诱导液晶的取向的能力明显优于周期1200 nm的SRGs.对周期同样为1200 nm,PA-AZ-CA表面光栅比BP-AZ-CA光栅具有更好的液晶取向能力.对于用圆偏振RCP+LCP干涉激光在PA-AZ-CA膜上刻录的SRGs,则观察不到液晶在SRGs表面的单轴取向.基于上述结果,对不同偶氮聚合物的分子结构及其SRGs的表面沟槽和膜内分子取向等因素对液晶取向的影响进行了讨论.
Surface-relief gratings (SRGs) were written using several azo-polymers with different chromophores and with different chromophore densities. The azo polymer structure, surface relief at different depths of relief, periodic and written polarization The effect of the gratings on the orientation performance of the liquid crystal was studied.The orientation ability of 5CB liquid crystal on the BP-AZ-CN film was gradually enhanced as the surface undulation grating was engraved by the linearly polarized p + p interference laser.Furthermore, The gratings with 800 and 1200 nm periods written on -CA and PA-AZ-CA films, respectively, can induce uniform alignment of the liquid crystal at depths from 16 to 100 nm. For BP-AZ-CA film SRGs with close- The SRGs with a period of 800 nm have better ability of orienting the liquid crystal than those with a period of 1200 nm. For the same period of 1200 nm, the PA-AZ-CA surface gratings have better liquid crystal orientation than the BP-AZ-CA gratings. For the SRGs recorded on the PA-AZ-CA film by a circularly polarized RCP + LCP interference laser, no uniaxial orientation of the liquid crystals on the surface of the SRGs was observed.Based on the above results, the molecular structures of different azo polymers and their SRGs Of the surface groove and molecular orientation within the film and other factors on the liquid crystal orientation Line discussions.