偶氮聚合物薄膜的吸收谱和二次谐波产生的温度特性  

Temperature properties of absorption spectra and second-harmonic generation in azo polymer thin films

作　　者：高学喜[1] 王文军[1] 刘云龙[1] 陶绪泉[2] 李淑红[1] 

机构地区：[1]聊城大学物理科学与信息工程学院,聊城252059 [2]聊城大学材料科学与工程学院,聊城252059

出　　处：《原子与分子物理学报》2008年第1期236-240,共5页Journal of Atomic and Molecular Physics

基　　金：国家863计划(2004AA32G090);山东省自然科学基金(Y2007A34);山东省教育厅科技发展(J07Y105);聊城大学校基金(X051049)

摘　　要：研究了一种偶氮聚合物薄膜的光谱和二阶非线性光学特性.研究结果表明,聚合体中的偶氮发色团以反式异构体形式存在.加热可使分子之间的相互作用减弱,聚集体的聚集程度降低;温度低于70℃时聚集体的结构不会发生变化,分子间相互作用的改变能够完全恢复;高于70℃降温后聚集体聚集程度的降低不能完全恢复.在一定温度下极化可使发色团偶极子定向有序排列,形成J-聚集体.偶氮聚合物薄膜的二阶非线性光学特性起源于偶极子模型,极化温度是影响极化膜二次谐波强度的重要因素之一,该偶氮聚合物薄膜的最佳极化温度约为90℃.The second-order nonlinear optical properties and spectra of an azo polymer thin films were investigated. The azo chromophore of the polymer exists in the formation of trans-isomer. The interaction of the intermolecular could be weakened and reduced the molecular aggregative degree by heating the polymer thin films. The structure of the polymer could not be changed when the temperature was under 70 ℃, and the change of the intermolecular interaction could completely recovery when the temperature resume to room temperature. The change of the molecular aggregative degree could not be completely resumed when the polymer film been heated higher than 70 ℃. The arrangement of azo chromophores could been turned into an ordering arrangement and formed J-aggregate by poling at some temperature. The second-order nonlinear optical properties of the azo polymer came from the dipole model. The poling temperature was an important factor of influencing the SHG intensity of the poling thin films. The best poling temperature of the azo polymer thin films was about 90 ℃.

关 键 词：偶氮聚合物 旋涂膜 电晕极化 二次谐波产生 

分 类 号：O484.4[理学—固体物理]