The Preparation And Thirdorder Nonlinear Optical Properties Of Ni、Cu Quantum Dots Doped In Glass

Nano metallic glass composites have attracted researchers’ great attention, not only because they can be applied to photochromic materials, colored glass circulation industry and three-dimensional color crafts, but also because of their potential applications in nonlinear optical materials. Such as optical data recording disks and storage devices, optical waveguide, and all-optical switch. In this paper, the integrated and transparent sodium borosilicate glasses that contain Ni, Cu and Cu3.8Ni nanoparticles were synthesized by combining the sol-gel process. And using a variety of characterization methods for sample analysis. The main contents of this paper are as follows:1. Ni nanoparticles have been successfully prepared from Ni(CH3COO)2·4H2O in sodium borosilicate(Na2O-B2O3-Si O2) glass matrix by sol-gel method, involving metallic sodium as sodium source, boric acid as boron source and Si O2 come from hydrolysis of tetraethoxysilane. The feasibility of process conditions were analyzed by using FT-IR, TG-DTA, and BET analysis of N2 adsorption aperture. XRD study revealed that the cubic structure of metal Ni have formed in the glass. The nonlinear optical properties were studied by using the Z-scan technique with a Ti:Sapphire laser at 800 nm. Results showed that the third-order optical nonlinear susceptibility χ(3) of the glass was determined to be 5.51×10-12 esu.2. The integrated and transparent sodium borosilicate glasses that contain copper exhibiting different colors, i.e. red, green and blue were synthesized by combining the sol–gel process and heat treatment in H2 gas. To reveal substantially the cause of different colors in the glass, Xray diffraction(XRD), transmission electron microscopy(TEM) and high resolution TEM(HRTEM) were applied to investigate the microstructure of the doped matter. The results showed three different crystals had formed in the red, green and blue glass, and the sizes of these crystals were range from 9-34 nm, 1-6 nm and 1-5 nm, respectively. The valence of copper was further determined by X-ray photoelectron spectroscopy(XPS) and electron energy loss spectroscopy(EELS). The third-order nonlinear optical properties of the glass were investigated by using Zscan technique at the wavelength of 800 nm with femtosecond Ti: sapphire laser radiation. The value of third-order optical nonlinear susceptibility χ(3) of the red, green and blue glass were estimated to be 3.48×10-11 esu, 2.17×10-10 esu and 1.62×10-10 esu, respectively.3. Cu3.8Ni quantum dots doped in sodium borosilicate glass were synthesized through sol-gel method and heat treatment in H2 gas. XRD analyses revealed that Cu3.8Ni quantum dots were in cubic phase; size and distribution of the quantum dots were measured by TEM, the results showed the size of these quantum dots ranged from 8.20 nm. The ultraviolet absorption spectrum confirmed the glass sample has a plasma resonance absorption peak at the wavelength of 584 nm. The surface plasmon resonance(SPR) of Sb nanoparticle was studied from the UV–Vis absorption; nonlinear optical properties of Cu3.8Ni quantum dots doped glass were investigated by using Z-scan technique at the wavelength of 800 nm, the value of nonlinear absorption coefficient β, nonlinear refraction index γ and the third-order nonlinear optical susceptibility χ(3) of the glass was estimated to be 3.73×10-10 m/W, 1.07×10-15 m2/W and 4.92×10-11 esu, respectively.