4-硝基-4-二甲基氨基偶氮苯薄膜的制备及光学性质  

Synthesis and Optical Properties of 4-Nitro-4-Dimethylaminoazobenzene Coatings

作　　者：董宏基 陈姝帆[2] 曹林洪[1] 吴卫东[1,2] Dong Hongji;Chen Shufan;Cao Linhong;Wu Weidong(School of Materials Science and Engineering,Southwest University of Science and Technology,Mianyang,Mianyang 621900,China;Research Center of Laser Fusion,China Academy of Engineering Physics,Mianyang 621900,China)

机构地区：[1]西南科技大学材料科学与工程学院,绵阳621900 [2]中国工程物理研究院激光聚变研究中心,绵阳621900

出　　处：《真空科学与技术学报》2019年第5期401-405,共5页Chinese Journal of Vacuum Science and Technology

基　　金：国家自然科学基金青年科学基金项目(61805221)

摘　　要：采用真空蒸发法制备了4-硝基-4-二甲基氨基偶氮苯(Azo)薄膜,研究了蒸发温度和薄膜厚度的关系。分别通过紫外-可见光谱和Z-扫描的方法研究了Azo薄膜的线性光学性质以及薄膜的三阶非线性光学性质。结果表明:Azo薄膜的紫外-可见光谱比Azo溶液紫外可见光谱蓝移了61 nm,该化合物薄膜的光学带隙(Eg)为2.71 eV;Azo薄膜呈现明显饱和吸收和自聚焦的非线性现象,其三阶非线性极化系数达到10^-7(esu)数量级,这表明该类Azo化合物材料可以作为全光开关的候选材料。4-nitro-4-dimethylaminoazobenzene(Azo) coatings were synthesized by physical vapor deposition(PVD) on sapphire substrate.The influence of the growth conditions,including the evaporation temperature,deposition rate and film thickness,on the linear/nonlinear optical properties of the Azo dye films was investigated with ultra-violet visible(UV-Vis) absorption spectroscopy and Z-scan of single pico-second laser beam.The preliminary results show that the solid azobenzene compound materials,such as Azo coatings,could be a promising candidate for fabrication of all-optical switch.To be specific,the UV-Vis spectrum of the Azo dye coating,with an optical gap of 2.71 eV,had a blue-shift of 61 nm with respect to that of Azo solution.In addition,Azo thin film exhibits the well-defined non-linear properties,including the saturated absorption and self-focusing;and the 3rd order nonlinear susceptibility reached a magnitude order of 10-7(esu).

关 键 词：偶氮染料 薄膜 Z扫描 三阶非线性 全光开关 

分 类 号：TQ613.11[化学工程—精细化工]