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Effect of concentration on the nonlinear optical response of gold poly(methyl methacrylate) nanocolloids

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Abstract

In this study, gold nanoparticles dispersed in poly(methyl methacrylate) were prepared by ablation with a 532 nm laser at different ablation times of 10, 20, and 30 min. The formation of gold nanoparticles in poly(methyl methacrylate) solution was confirmed using ultraviolet-visible spectroscopy, and their size and concentration were estimated using a dynamic light scattering method and atomic absorption spectroscopy, respectively. Linear optical studies indicated a slight blue shift in the surface resonance plasmon of the absorption wavelength with the increase of ablation time. The nonlinear optical properties of the nanocolloids were investigated by using a continuous wave of the 532 nm diode laser with a beam power of 40 mW in the Z-scan technique. All investigated samples showed negative and large thermally induced nonlinear refractive indices. The results confirm that the nonlinear refractive index increases with the increase in ablation time.

© 2019 Optical Society of America

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