【作者】 杨修春； 董志伟； 李志会； 钱士雄； 黄文旵；

【Author】 YANG Xiu-chun, DONG Zhi-wei, LI Zhi-hui, QIANG Shi-xiong, HUANG Wen-chan ( School of Materials Science and Engineering, Tongji University, Shanghai 200092, China; Department of Physics, Fudan University, Shanghai 200433, China)

【机构】 同济大学材料科学与工程学院； 复旦大学物理学系；

【摘要】 采用离子交换结合热处理方法,制备出银纳米颗粒-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。更多还原

【Abstract】 Ag nanoparticle-glass composite films were prepared by ion-exchange and subsequently thermal treatment method. Optical absorption spectrascopy 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 nanopartides and increase of volume fraction of Ag nanopartides 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 nanoparticle size and an increase of the volume fraction of Ag nanopartides in the composite film, however, the third-order optical nonlinearity of the corresponding film reduces.更多还原