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.
Silver nanostructures were fabricated by laser direct writing technique using 796-nm Ti:Sapphire femtosecond laser pulses in polymer matrix containing silver ions that has been spin coated on a silicon substrate. Silver nanostructures that resulted inside the polymer matrix were obtained by the nonlinear optical interaction between femtosecond laser pulses and polymer films containing silver ions. We report here the characterization of the silver nanostructures using UV-Vis extinction spectra, field emission scanning electron, and atomic force microscope images. Formation of silver nanoparticles inside the laser written microstructures is confirmed by the appearance of surface plasmon absorption band at 448 nm in the UV-Vis extinction spectrum. Nanoparticles formed were spherical in shape with average particle size <20 nm . This technique is a cost-effective approach and has potential applications in the fabrication of fine metallic micro/nanostructures for microelectromechanical systems, nanoelectronics, and nanophotonics.
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