Non-Resonant Third-Order Nonlinearity of Nanometric and Subnanometric Silver Particles in Aqueous Solution
We have measured and analyzed the behavior of the nonlinear refractive index of silver spheres in water in a non-resonant femtosecond excitation regime. Two different diameter silver nanosphere (0.65 and 9 nm) suspensions were used in the experiments. Thermal and nonthermal contributions
to the nonlinear properties of the samples were determined exploring a novel high sensitivity thermal managed eclipse Z-scan technique. The dependence of nonthermal third order nonlinear susceptibility of the colloid with the silver nanoparticles filling factor was described using the generalized
Maxwell-Garnett model. The nanoparticle size dependence of the colloid nonlinear refractive index was observed.
Keywords: REFRACTIVE INDEX; SILVER NANOPARTICLES; THIRD-ORDER NONLINEARITY
Document Type: Research Article
Publication date: 01 March 2009
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