Diffraction patterns and nonlinear optical properties of Nanocomposite (Gold nanoparticles / Epoxy resin polymer)

Abstract

We observed and analyzed diffraction rings produced by CW Nd: YAG visible laser beam in a nanocomposite of gold nanoparticles doped by epoxy resin polymer. Change of refractive index, Δn, and nonlinear refractive index, n2 were calculated based on the number of rings observed. A thermal effect is due to this major nonlinearity. With rising input power and sample thickness the number of rings increases. Spot diameter of rings was calculated and noted it increase wih input power increasing and decreasing thickness of sample.