In the present work, we show the results of theoretical calculations of nonlinear optical properties of choline chloride – urea deep eutectic solvent mixture. Deep eutectic solvents are a novel kind of solvents with similar properties to classic ionic liquids but with advantages like been easy to prepare and biodegradable. We had obtained the most stable structure using DFT optimization with M06-2X/6-311G(d,p). Then their static and dynamic (at 477 nm) first and second order hyperpolarizabilities were obtained. These results were used to estimate the third order nonlinear susceptibility showing that this solvent is promising for nonlinear optics-related application.
In this work we present the synthesis of Au@Ag bimetallic nanoparticles via seed-mediated method and their nonlinear optical properties. For the synthesis of nanoparticles, 18 nm gold seeds were synthesized by Turkevich method followed by the silver ion reduction with ascorbic acid. The nanoparticles dispersion was analyzed by UV-Vis spectroscopy and the spectra suggest the formation of spherical core@shell bimetallic nanoparticles. SEM images were obtained in order to corroborate this. The nanoparticles dispersions present negative and positive nonlinear absorption coefficient and negative refraction index, according to z-scan measurements. The nonlinear optical properties can be tailor modifying the thickness of shell.