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formation TiO 2 nanorods. The structure of the sample was studied by X-ray diffraction and it revealed that the prepared TiO 2 exhibit a pure anatase phase. While the Fourier transform infrared spectroscopy (FTIR) was showing the vibration patterns in the spectrum of the sample. The morphology of sample was studied by scanning electron microscopy (SEM) and it showed that the synthesised TiO 2 made of nanorods with length about (698 nm) and a diameter (220 nm). IntroductionTitanium dioxide (TiO 2 ) is a semiconductor material that has a wide energy gap (3.2 eV) [1, 2]. Many studies have been focused in the present time on TiO 2 , due to its large surface area and characteristic electrical properties such as physical and chemical stability, high refractive index, low cost, non-toxicity and high photo-catalytic activities…etc. TiO 2 can be found in three crystalline phases: anatase, rutile both tetragonal structure and brookite with orthorhombic structure. Each of these phases have various chemical and physical properties depending on the composition of the atoms, thus leads to a varied performance in its application [3,4]. Anatase and brookite are metastable, while rutile phase is stable under certain conditions [5]. The anatase and brookite phases are easily turned to rutile phase during a high temperature [6,7]. Different morphologies of TiO 2 have been synthesized such as nanorods, nanowires, nanotubes, nanoparticles and nanobelts…etc. One dimension (1D) structures of TiO 2 especially nanorods, nanowires and nanotubes have been attracted a lot of attention due to the unique properties and great applications comparison nanoparticles. TiO 2 with (1D) structures have exhibited the faster process of generating electron-hole and a lower recombination rate comparison TiO 2 nanoparticle [8,9]

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In this paper, We prepared nanoparticles using the Turkevich process. The characterization of gold nanoparticles is carried out using a Scanning Electron Microscope (SEM). Linear optical properties studied by UV-visible Spectroscopy. Investigation of the optical limiting properties (OL) of nanocomposite (AuNPs / Epoxy resin) at different thicknesses (2.5, 9, 10.5, 14.3, 20.5, and 34) μm is performed. The threshold and optical clamping were calculated from optical limiting operation implemented by the Z-scan technique using CW Nd: YAG laser at (532 nm). The samples showed low optical limiting thresholds, which can be demonstrated by the strong absorption of the two photons in these samples. The nanocomposite displays the lowest optical limiting threshold (66 mW) at a thickness (2.5) μm. We notice that the nonlinear light-induced absorption results in an optical limited.

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