Abstract

The nonlinear (NL) optical properties of silver nanoparticles (NPs) colloids stabilized using sodium citrate, poly(N-vinylpyrrolidone), and polyvinyl alcohol in aqueous solutions were investigated. The characterization of the colloids was made through linear absorption, transmission electron microscopy, and the Z-scan technique at 532nm. Changes in the NL optical response of the samples were observed due to different molecules adsorbed on the NPs’ surface. The third-order nonlinearity of the silver NPs with different stabilizers is discussed, and the results are associated with the scattering parameter A, which is related to the shift and broadening of the NPs’ surface plasmon resonance. The NL susceptibility of the NPs was determined for each colloid, and from the results the influence of the stabilizing agents on the NPs’ susceptibility is clear.

© 2007 Optical Society of America

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