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This paper reports that single-layer and graded Au-TiO 2 granular composite films with Au atom content 15%- 66% were prepared by using reactive co-sputtering technique. The third-order optical nonlinearity of single-layer and graded composite films was investigated by using sand p-polarized Z-scans in femtosecond time scale. The nonlinear absorption coefficient β eff of single-layer Au-TiO 2 films is measured to be -2.3×10 3 0.76×10 3 cm/GW with Au atom content 15%-66%. The β eff value of the 10-layer Au-TiO 2 graded film is enhanced to be -2.1×10 4 cm/GW calculated from p-polarized Z-scans, which is about ten times the maximum β eff of single-layer films. Broadened response in the wavelength region 730-860 nm of the enhanced optical nonlinearity of graded Au-TiO 2 composite films was also investigated.
This paper reports that single-layer and graded Au-TiO 2 granular composite films with Au atom content 15% -66% were prepared by using reactive co-sputtering technique. The third-order optical nonlinearity of single-layer and graded composite films was investigated by using sand p-polarized Z-scans in femtosecond time scale. The nonlinear absorption coefficient β eff of single-layer Au-TiO 2 films was measured to be -2.3 × 10 3 0.76 × 10 3 cm / GW with Au atom content 15% -66%. The β eff value of the 10-layer Au-TiO 2 graded film is enhanced to be -2.1 × 10 4 cm / GW calculated from p-polarized Z-scans, which is about ten times the maximum β eff of single-layer films. Broadened response in the wavelength region 730-860 nm of the enhanced optical nonlinearity of graded Au-TiO 2 composite films was also investigated.