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运用超瑞利散射 (HRS)技术 ,对由KNO3诱导聚集的银纳米粒子的二阶光学非线性特性进行了实验研究 .通过粒子尺寸测量和透射电镜观察 ,表明银纳米粒子的聚集方式为链状聚集 .当聚集体平均尺寸为 12 0nm时 ,银纳米粒子聚集体的HRS信号强度比聚集前增大了约 15倍 .分析表明 ,聚集导致银纳米粒子表面电场极化强度的增强和极化分布的改变 ,并通过表面和体贡献机理对二阶非线性极化过程产生影响
The second-order optical nonlinearity of silver nanoparticles induced by KNO3 was investigated by using super-Rayleigh scattering (HRS) technique. The particle size measurement and transmission electron microscopy showed that silver nanoparticles were aggregated in the form of chains Aggregation.When the average size of the aggregates was 12 0nm, the HRS signal intensity of aggregates of silver nanoparticles was increased by about 15 times than that before aggregation.The analysis showed that the aggregation resulted in enhanced polarization and polarization distribution on the surface of the silver nanoparticle , And influence the second-order nonlinear polarization process by means of surface and body contributions