We report the fabrication of nanoparticle gold thin films by DC magnetron sputtering and characterization of their
nonlinear optical properties. Nonlinear optical response was investigated by moiré deflectometery technique using
5mW He- Ne laser (632.8 nm) illumination. All prepared films were characterized by XRD and UV-VIS-NIR
spectrophotometry. The measured thermal Nonlinear refractive index (n2=-2.2×10-5 cm2 W-1) makes it promising for
applications in all-optical switching devices and optical data storage systems.
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