Morphological Changes of Silver Nanoparticle Distributions in Glass Induced by Ultrashort Laser Pulses
Morphological Changes of Silver Nanoparticle Distributions in Glass Induced by Ultrashort Laser Pulses
复制标题
超短激光脉冲诱导玻璃中银纳米粒子分布的形态变化
DOI：
10.1021/jp002039w
复制
发表时间：
2000
影响因子：
3.3
通讯作者：
H. Graener
中科院分区：
文献类型：
--
作者：
M. Kaempfe;H. Hofmeister;S. Hopfe;†. A. G. Seifert;H. Graener
利用高分辨电子显微镜和空间分辨光学透射光谱研究了银纳米粒子在玻璃中的持久形态变化以及由此产生的飞秒强激光脉冲辐照引起的二色性颜色变化。电子显微镜显示了银颗粒的各种形态变化，特别是被由非常小的银簇组成的晕状结构包围的不规则形状的颗粒。光谱分析表明，在较低的强度下，优选地发生银解吸到玻璃基质中，产生各向同性光谱变化，而在较高的强度下，观察到由颗粒变形引起的各向异性光谱。对不同激光波长产生的影响进行分析，可以将这些发现与颗粒大小的变化（取决于其穿透深度）相关联。
Persistent form modifications of silver nanoparticles in glass and the resulting dichroitic color changes induced by irradiation of a single intense femtosecond laser pulse were studied by means of high-resolution electron microscopy and spatially resolved optical transmission spectroscopy. Electron microscopy reveals a variety of morphological changes of the silver particles, in particular irregularly shaped particles surrounded by halolike structures consisting of very small silver clusters. The spectral analysis suggests that at lower intensities preferably desorption of silver into the glass matrix occurs producing isotropic spectral changes, while at higher intensities anisotropic spectra caused by particle deformation are observed. An analysis of the effects produced by different laser wavelengths allows one to correlate these findings with the variations of particle sizes depending on their penetration depth.