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| - Study on the Behavior of Hyper-Rayleigh Scattering for Silver Nanoparticles withAggregation Effects
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| - The absorption spectra as well as the Hyper-Rayleigh scattering (HRS) signals of a highly monodisperse10.5-nm diameter silver colloids with the addition of KNO3 and pyridine have been measured. Stronglyenhanced HRS signals are observed by 15× and 6×, respectively. Through size distribution and TEMmeasurements, the morphology of aggregated silver nanoparticles has been observed as a chainlike aggregation.The dramatically enhanced second-order nonlinearity was explained by the enhanced electromagnetic (EM)field near the surface of the silver nanoparticles as they approached. The different enhancement betweenthese two kinds of aggregates was considered with the diversity of separated distance between silvernanoparticles. The experimental results reveal that there is an optimum size for the aggregates to yield themaximum HRS response.
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