银纳米颗粒-玻璃复合薄膜的三阶非线性光学性能  

Third-order Optical Nonlinearities of Silver Nanoparticle-glass Composite Films

作　　者：杨修春[1] 董志伟[2] 李志会[1] 钱士雄[2] 黄文旵[1] 

机构地区：[1]同济大学材料科学与工程学院,上海200092 [2]复旦大学物理学系,上海200433

出　　处：《武汉理工大学学报》2007年第E01期305-310,共6页Journal of Wuhan University of Technology

基　　金：上海市科委基础研究重点项目（05JC14058）和国家自然科学基金（50672069）

摘　　要：采用离子交换结合热处理方法，制备出银纳米颗粒一玻璃复合薄膜。利用光学吸收谱和Z-扫描技术研究了该复合薄膜的线性和三阶非线性光学性能。研究结果表明，延长热处理时间有利于提高银纳米颗粒尺寸和银纳米颗粒在玻璃中的体积分数。导致复合薄膜的三阶非线性系数增大。当熔盐中AgNO3／NaNO3的质量分数由0.1％提高到0．5％时，相同条件热处理后玻璃中银纳米颗粒的尺寸和体积分数有较大增长，复合薄膜的三阶非线性系数增大；进一步提高熔盐中AgNO3／NaNO3的质量分数，热处理后玻璃中银纳米颗粒的尺寸反而降低，但银纳米颗粒在玻璃中的体积分数增大，材料的三阶非线性系数不增反降。Ag nanoparticle-glass composite films were prepared by ion-exchange and subsequently thermal treatment method. Optical absorption spectroscopy and Z-scan technique were used to measure linear absorption and third-order optical nonlinearity of the films, Results indicate that prolongation of annealing time favors growth of Ag nanoparticles and increase of volume fraction of Ag nanoparticles in the corresponding composite film, which induce an increase of third-order optical nonlinearity. When mass fraction of AgNO3 in melt AgNO3 ＋ NaNO3 mixture rises from 0.1% to 0.5 %, Ag nanoparticle size and volume fraction in the composite film increases, accordingly, the third-order optical nonlinearity of the film rises. Further increase of AgNO3 content in AgNO3 ＋ NaNO3 melt mixture make a decrease of Ag nanopartiele size and an increase of the volume fraction of Ag nanoparticles in the composite film, however, the third-order optical nonlinearity of the corresponding film reduces.

关 键 词：离子交换 银纳米颗粒-玻璃复合膜 Z-扫描技术 三阶光学非线性 

分 类 号：TB333[一般工业技术—材料科学与工程]