核壳结构偶氮聚合物的全光开关效应研究  

Study of All-Optical Switching Effect of Polymer Films Containing Azo-Dye in Core-Shell Structure

作　　者：罗锻斌[1] 佘卫龙[2] 吴水珠[3] 曾钫[3] 姚胜兰[3] 

机构地区：[1]华东理工大学理学院物理系,上海200237 [2]中山大学光电材料与技术国家重点实验室,广东广州510275 [3]华南理工大学高分子材料科学与工程系,广东广州510640

出　　处：《中国激光》2005年第12期1636-1640,共5页Chinese Journal of Lasers

基　　金：广东省科技计划项目(A1060201);广州市科技计划(2002J1-C0111)资助项目

摘　　要：分别用主客掺杂法和种子乳液聚合法制备了含相同浓度偶氮染料分散红4-(2-hydroxyethyl)ethylamino-2-chloro-4-nitroazobenzene(Disperse Red 13,DR13)的聚甲基丙烯酸甲酯poly(methyl methacrylate)(PMMA)均匀薄膜样品。用经斩波器调制的线偏振氩离子激光(514 nm,CW)作用于样品产生光致双折射。作为探测光的线偏振氦氖激光(633 nm,CW)经过样品,通过与原来偏振方向垂直的检偏器的透射光强强度的调制,实现了光控光的全光开关效应。研究比较了两种样品在控制不同光功率下的光致双折射效应和全光开关效应,比较发现用种子乳液聚合法制备的具有核壳结构的样品在控制光功率、开关时间及开关调制深度等方面均优于主客掺杂样品。Conventional guest-host doping sample and core-shell structure sample were synthesized through directly doping azo-dye 4- （2-hydroxyethyl） ethylamino-2-chloro-4-nitroazobenzene （Disperse Red 13, DR13 ） in poly （ methyl methacrylate） （PMMA） polymer matrices and seed emulsion polymerization, respectively. Based on the photoinduced isomerization and orientation of DR13 molecules, the photo-induced birefringence and all-optical switching effect of these two kinds of materials were studied and compared at different pumping power. It was found that at low control beam power, faster response and larger modulation depth could be obtained in core-shell structure samples comparing to the guest-host one.

关 键 词：非线性光学 全光开关 光致双折射效应 偶氮化合物 核壳结构 

分 类 号：TN929.11[电子电信—通信与信息系统] O437[电子电信—信息与通信工程]