Nanosecond nonlinear absorption in Au and Ag nanoparticles precipitated glasses induced by a femtosecond laser
Nanosecond nonlinear absorption in Au and Ag nanoparticles precipitated glasses induced by a femtosecond laser
复制标题
DOI：
10.1016/j.optmat.2005.01.011
复制
发表时间：
2006-02
影响因子：
3.9
通讯作者：
S. Qu;Yawen Zhang;Huajun Li;J. Qiu;Congshan Zhu
中科院分区：
文献类型：
--
作者：
S. Qu;Yawen Zhang;Huajun Li;J. Qiu;Congshan Zhu
利用聚焦飞秒脉冲辐照获得了在玻璃中析出的Au和Ag纳米粒子，并利用532nm波长的ns脉冲z扫描技术研究了玻璃的非线性吸收。我们观察了金纳米颗粒沉淀玻璃的饱和吸收行为和银纳米颗粒的反饱和吸收行为。通过拟合在离表面等离子体共振近和远的局部场效应下的实验结果，我们得到Au和Ag纳米粒子的三阶磁化率的虚部分别为χm(3)=4.5×10-7and 5.9×10−8esu。Au纳米粒子在玻璃样品中的非线性响应主要来自热电子贡献和表面等离子体共振附近带间跃迁的饱和，而Ag纳米粒子在玻璃样品中的非线性响应主要来自带间跃迁。这表明所制备的玻璃可以作为光电器件，满足不同的要求。
We obtain Au and Ag nanoparticles precipitated in glasses by irradiation of focused femtosecond pulses, and investigate the nonlinear absorptions of the glasses by using Z-scan technique with ns pulses at 532nm. We observe the saturable absorption behavior for Au nanoparticles precipitated glasses and the reverse saturable ones for Ag ones. We also obtain, by fitting to the experimental results in the light of the local field effect near and away from the surface plasmon resonance, χm(3)=4.5×10-7and 5.9×10−8esu for the imaginary parts of the third-order susceptibilities for Au and Ag nanoparticles, respectively. The nonlinear response of Au nanoparticles in the glass samples arises mainly from the hot-electron contribution and the saturation of the interband transitions near the surface plasmon resonance, whereas that of Ag nanoparticles in the glass samples from the interband transitions. These show that the obtained glasses can be used as optoelectronic devices suiting for different demands.