Solvent effect on the synthesis of cobalt nanoparticles by pulsed laser ablation: their linear and nonlinear optical properties

Abstract. We present our results on the linear and nonlinear optical properties of cobalt nanoparticles synthesized by laser ablation in different organic solvents. Transmission electron microscopy and UV-visible absorption were used for the characterization of morphology, size distribution, and optical properties, respectively. Nonlinear scattering and nonlinear absorption are regarded as the processes contributing to the observed optical-limiting behavior in these nanoparticles, which were investigated by performing Z-scan measurements. Due to strong two-photon absorption and nonlinear scattering, cobalt nanoparticles dispersed in chlorobenzene and chloroform exhibit superior optical-limiting threshold when compared with other solvents.

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