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.
Department of Electronics and Systems, Biomedical Engineering, Universidade Federal de Pernambuco, Recife-PE 50740-530, Brazil.
Diego
D
Rativa
R E
RE
de Araujo
A S L
AS
Gomes
D003102:Colloids; D053768:Metal Nanoparticles / Q000737:chemistry*; D017711:Nonlinear Dynamics; D012031:Refractometry; D012834:Silver / Q000737:chemistry*; D013057:Spectrum Analysis; D013696:Temperature; D014867:Water
D003102:Colloids; D014867:Water; D012834:Silver