Document Type : Research
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Abstract
In this experimental work optical nonlinear properties of aqueous solution of oxazine 1 dye and solutions containing of Ag nanoparticles were studied. For this purpose four samples as 0.2 mM aqueous solution of dye and solutions of dye containing 200, 300 and 400 ppm of colloidal Ag nanoparticles were prepared. All the aqueous samples showed a negative nonlinear refractive index of the order of 10-8 cm2/W. It was found that adding nano-particles decreases nonlinear refractive index of solutions. Also, nonlinear absorption of the samples were studied using open z-scan method. It was obsorved that in the pure aqueous solution of dye reverse saturation absorption is dominant mechanism of nonlinear absorption and adding silver nanoparticles decreases reverse saturation absorption of samples and increases saturation absorption of them. It seems that these differences in nonlinear properties were due to reduction of molecular aggregation of dye in water in presnce of silver nanoparticles.
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