Nonlinear Optical Response of colloidal and films gold nanoparticles synthesized by Chitosan

Abstract

In this work Z-scan curves were obtained for colloidal and film samples of gold nanoparticles synthesized with chitosan. Under similar conditions the film samples showed a bigger response than the colloids. The results were reproduced and compared with a phenomenological model which takes into account the nonlocal character of the interaction, in order to estimate the refractive index change. Films were obtained adding hydroxypropyl methyl cellulose (HPMC) and sorbitol to the solution. Measures were done with an Argon-ion cw laser at a wavelength of 514 nm and powers ofmW.