Effect of Laser Ablation Parameters on Nonlinear Optical Properties of ZnO/Au Nanoparticles

Abstract

— In this study, ZnO as the group II-VI materials and Au noble metal synthesized by pulsed laser ablation (PLA) method in ethanol medium based on laser parameters. Laser ablation method applied on ZnO, Au and ZnO/Au high purity bulk materials to produce nanoparticles which have been carried out using Ti:Sapphire femtosecond (fs) laser system. Linear absorption spectra were recorded using Uv-Vis spectrometer and surface plasmon resonance have been observed between 520 nm and 540 nm wavelengths. The nonlinear optical properties for ZnO, Au and ZnO/Au nanoparticles have been determined by using a z-scan experimental system using an open&closed aperture results and third order susceptibilities have been calculated. The calculated results for nanoparticles produced in ethanol medium, the nonlinear absorption coefficient, β , (~10 -11 cm/W), the nonlinear refraction coefficient, n 2 (~ 10 -16 cm 2 /W) and third order susceptibilities , χ (3) , (~ 10 -14 esu) for each of ZnO, Au and ZnO/Au nanoparticles have been presented in this work and it has been concluded that the results obtained are all in agreement with data reported in literature .