一种具有自取向极化效应的有机光折变体系  

Photorefractive Polymer with Self-orientated Polarization

作　　者：杨剑[1] 方方[1] 徐华华[2] 邢晓艳[1] 孙大林[1] 陈国荣[1] 李潞瑛[3] 赵有源[3] 

机构地区：[1]复旦大学材料科学系,上海200433 [2]复旦大学化学系,上海200433 [3]复旦大学光科学与工程系先进光子学材料与器件国家重点实验室,上海200433

出　　处：《真空科学与技术学报》2005年第6期435-438,共4页Chinese Journal of Vacuum Science and Technology

基　　金：上海市科委基金项目(No.0352nm012)

摘　　要：在用真空热压-饱和蒸汽扩散法制备的PVK-PBA/DR1/TNF有机聚合物体系中,观察到了无外电场作用下的较强的光折变效应。通过对样品的双波耦合、四波混频实验中,改变电场强度、电场方向或不加外电场而只改变光强,观察到的衍射效率的变化情况以及测量样品在单纯光照诱导下的光学非线性系数等一系列实验,可以认为光照时在该有机聚合物体系中由DR1分子两端的推、吸电子基团与光生分离的正负电荷相互作用而引发了“自极化”,从而产生周期性空间电场,最终产生自增强光折变效应。另外进行了图象存储实验,获得了理想的结果。本研究对发展零外场聚合物光折变体系有重要的参考意义。Fairly strong photo-refraction was observed of the PVK-PBA/DRI/INF composite polymer, prepqred by vacuum hot-pressing plus vapor dispersion, in the two-beam coupling and four-wave mixing diffraction measurement with no external electric field applied. Secondharmonic generation induced by laser in-adiation was also observed. To account for our observations, we propose a serf-orientated polarization mechanism,in which charge separation induced by laser irradiation results in formation of the push-electron and pull-electron radicals at the two ends of a DRI molecule. And interaction of these radicals and the traps leads to polarization of a DRI molecule and the build-up of an internal periodic eleetric field, which is responsible for the photo-refraction. The holography storage with the composite polymer was also performed with good results.

关 键 词：光电子学 光折变效应 有机聚合物 全息储存 二波耦合 四波混频 

分 类 号：O484.1[理学—固体物理]