掺杂浓度与溶剂对偶氮聚合物薄膜全光开关特性的影响  

Effects of Doping Concentration and Solvent on All-Optical Switching Characteristics of Azo-Dye-Doped Polymer Films

作　　者：刘如军[1] 许棠[1] 张春平[2] 郝召锋[2] 

机构地区：[1]湛江师范学院测试中心,广东湛江524048 [2]南开大学物理科学学院光子学中心弱光非线性光子学材料先进技术及制备实验室,天津300071

出　　处：《光子学报》2008年第2期252-255,共4页Acta Photonica Sinica

基　　金：国家自然科学基金(60578020);广东省自然科学基金(04011427);湛江师范学院博士基金(ZL0510)资助

摘　　要：用重复旋转涂膜法制备了乙基红(ER)偶氮染料与聚甲基丙烯酸甲酯(PMMA)掺杂聚合物薄膜和乙基橙(EO)与聚乙烯醇(PVA)掺杂聚合物薄膜.测量了两种聚合物薄膜样品全光开关特性,比较分析了薄膜样品的掺杂浓度和溶剂对全光开关效应的影响,实验结果表明:增加掺杂浓度和溶剂,极性薄膜样品的全光开关效应增强且开关的本底信号增大,但对开关的响应速度影响很小;选择合适的掺杂浓度和强极性溶剂,在室温和几个mW的弱功率控制光条件下聚合物薄膜具有毫秒级开关响应时间和40%以上的开关调制深度,最大的调制深度达72%以上.Ethyl Red doped polymer （PMMA） films and Ethyl Orange doped polymer （PVA） films are prepared by the repeat-spin coating method, the all-optical switching characteristics of the azo dye doped film samples are measured, and the effects of the doping concentrations and the solvents on all-optical switching characteristics of the samples are investigated. The experimental results demonstrate that with the increasing doping concentration and the polarity of solvents,the samples will show stronger all optical switching effect and larger background signal of the switch, but the effect on the response speed of optical switch is trivial. In room temperature condition and with the control beam power of several milliwatts,the polymer films have the response time in millisecond magnitude and the depth of switch modulation above 40% by choosing the proper doping concentrations of the polymer films and the solvent with the strong polarity,and the maximal depth of switch modulation reaches 72%.

关 键 词：偶氮聚合物 全光开关 开关速度 调制深度 

分 类 号：O632.6[理学—高分子化学] TN252[理学—化学]