摘要Au-TiO2 dis-conductive composite films with Au atom concentrate as high as 82% are prepared by using reactive co-sputtering technique. The annealing effect on the nanostructures and optical nonlinearities of the composite films are investigated. Au nanoparticles aggregated to semi-continuum network structures during the annealing processes. As the annealing temperature increases from 25°C to 400°C, the surface plasmon absorption band is shifted and its strength is increased, consequently, the nonlinear absorption coefficient β decreases from 5.6×104cm/GW to -1.7×104cm/GW, while the nonlinear refractive index γ increases from -0.95cm2/GW to 1.3cm2/GW.
Abstract：Au-TiO2 dis-conductive composite films with Au atom concentrate as high as 82% are prepared by using reactive co-sputtering technique. The annealing effect on the nanostructures and optical nonlinearities of the composite films are investigated. Au nanoparticles aggregated to semi-continuum network structures during the annealing processes. As the annealing temperature increases from 25°C to 400°C, the surface plasmon absorption band is shifted and its strength is increased, consequently, the nonlinear absorption coefficient β decreases from 5.6×104cm/GW to -1.7×104cm/GW, while the nonlinear refractive index γ increases from -0.95cm2/GW to 1.3cm2/GW.
PENG Xiao-Niu;LI Min;YU Liao;ZHANG Xian;ZHOU Li. Annealing Induced Aggregations and Sign Alterations of Nonlinear Absorption and Refraction of Dense Au Nanoparticles in TiO2 Films[J]. 中国物理快报, 2008, 25(11): 4171-4173.
PENG Xiao-Niu, LI Min, YU Liao, ZHANG Xian, ZHOU Li. Annealing Induced Aggregations and Sign Alterations of Nonlinear Absorption and Refraction of Dense Au Nanoparticles in TiO2 Films. Chin. Phys. Lett., 2008, 25(11): 4171-4173.
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