AUTHOR=Jalili Zahra , Koushki Ehsan , Ehsanian Amir Hossein , Tayebee Reza , Maleki Behrooz 

TITLE=Synthesis, band gap structure and third order non-linear optical properties of zinc tungsten oxide nanocomposite using a single CW laser beam

JOURNAL=Frontiers in Chemistry

VOLUME=Volume 11 - 2023

YEAR=2023

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2023.1152501

DOI=10.3389/fchem.2023.1152501

ISSN=2296-2646

ABSTRACT=In this study, a composite of zinc tungsten oxide nanoparticles (W-ZnO NPs) has been synthesized via mixing of Na2WO4 and zinc acetate in water, followed by dropwise addition of NaOH. The synthesized W-ZnO NPs were characterized using measurement methods such as XRD, DLS, SEM and UV-Vis. Also, results were compared with pure synthesized ZnO and WO3 NPs. Nonlinear optical properties of the synthesized composite were measured using the Z-scan technique with a continuous wave Nd-Yag laser. The nonlinear absorption coefficient of the components was obtained negatively and it indicates that the saturation absorption occurred in this composite. In comparison with pure ZnO NPs, nonlinear absorption decreases that can be attributed to the negligible optical response of WO3 structures. Also, the negative value of the close aperture Z-scan curve shows that the thermal lensing effect is the main reason for third-order nonlinear refraction.