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Optical Engineering

Effect of concentration on the plasmonic absorption and optical nonlinearity of gold nanoparticles
Author(s): Morvarid Rashidian; Davoud Dorranian
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Paper Abstract

The effect of concentration on the optical nonlinearity of gold nanoparticles is investigated. Gold nanoparticles were synthesized by nanosecond-pulsed laser ablation of a high-purity gold plate in distilled water. The size of nanoparticles was measured using dynamic light scattering (DLS) method and was calculated from full width half maximum of their plasmonic absorption peak using Mie theory. Different nonlinear characteristics of gold nanoparticles are observed by considering their effects under irradiation with a second harmonic beam of a continuous-wave low power Nd-YAG laser at 532 nm. Low-power optical limiting with low limiting threshold is obtained in the sample using different apertures at different points of the laser beam path. The nonlinear optical responses are characterized by measuring the intensity dependent refractive index of medium using the z-scan technique. Results show that the linear absorption coefficient and nonlinear refractive index of samples are increased with increasing the concentration of gold nanoparticles in distilled water. Increasing the intensity of the probe beam leads to increasing the magnitude of nonlinear refractive index.

Paper Details

Date Published: 2 August 2012
PDF: 8 pages
Opt. Eng. 51(8) 089001 doi: 10.1117/1.OE.51.8.089001
Published in: Optical Engineering Volume 51, Issue 8
Show Author Affiliations
Morvarid Rashidian, Islamic Azad Univ. (Iran, Islamic Republic of)
Davoud Dorranian, Islamic Azad Univ. (Iran, Islamic Republic of)

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