Effects of Laser Pulse Width and Solvent on the Optical Nonlinearities of ZnO Nanoparticles

Chang, Qing; Zhang, Dongshuai; Gao, Meiling; Zhen, Shengbin

doi:10.1142/9789814719391_0061

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“…The results revealed that ZnO thin films had reverse saturable absorption (RSA) and a negative nonlinear refractive index. However, due to the difficulty in creating colloids with high homogeneity and homogeneous sizes and shapes, only a few studies [ 52 , 53 ] have reported on the investigation of ZnO nonlinearity as nanocolloids. Due to thermal effects, the NLO properties of ZnONPs under ns laser pulses are stronger than those under ps laser pulses, according to [ 52 ].…”

Section: Introductionmentioning

confidence: 99%

“…However, due to the difficulty in creating colloids with high homogeneity and homogeneous sizes and shapes, only a few studies [ 52 , 53 ] have reported on the investigation of ZnO nonlinearity as nanocolloids. Due to thermal effects, the NLO properties of ZnONPs under ns laser pulses are stronger than those under ps laser pulses, according to [ 52 ]. On the other hand, [ 53 ] looked at the effects of ZnONPs’ shapes and solvents on the NLO properties.…”

Section: Introductionmentioning

confidence: 99%

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Nonlinear Optical Properties of Zinc Oxide Nanoparticle Colloids Prepared by Pulsed Laser Ablation in Distilled Water

et al. 2022

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The nonlinear optical properties of zinc oxide nanoparticles (ZnONPs) in distilled water were measured using a femtosecond laser and the Z-scan technique. The ZnONPs colloids were created by the ablation of zinc bulk in distilled water with a 532 nm Nd: YAG laser. Transmission electron microscopy, an ultraviolet-visible spectrophotometer, and atomic absorption spectrophotometry were used to determine the size, shape, absorption spectra, and concentration of the ZnONPs colloids. The nonlinear absorption coefficient and nonlinear refractive index were measured at different excitation wavelengths and intensities. The nonlinear absorption coefficient of the ZnONPs colloids was found to be positive, caused by reverse saturable absorption, whereas the nonlinear refractive index was found to be negative due to self-defocusing in the ZnONPs. Both laser parameters, such as excitation wavelength and input intensity, and nanoparticle features, such as concentration and size, were found to influence the nonlinear optical properties of the ZnONPs.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%