Second harmonic generation from silver nanoparticles in aqueous solution with different protective agents
2014
Nanometer-sized metallic colloidal particles with plasmonic resonances in the visible range are widely investigated for
their attractive optical properties as sensors, for imaging and cancer treatment. Their second-order nonlinear optical
properties are remarkably high. In this work, silver colloidal solutions have been synthesized by a simple and quick
method in aqueous solutions with different protective agents (PVA, PVP). The first hyperpolarizability β values of Ag
per atom and per particle for nanospheres at 1064 nm have been measured. Silver nanoparticles, which possess intense
visible region surface plasmon absorption bands, prove to be excellent nonlinear scatterers.
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