A Sign Alternation of Nonlinear Absorption in Gold Composite Films in Z-Scan
CHEN Dai-Jian1 , DING Sha1 , HAN Jun-Bo1 , ZHOU Hui-Jun1 , XIAO Si1 , XIONG Gui-Guang1 , WANG Qu-Quan1,2
1 Department of Physics, Wuhan University, Wuhan 430072
2 Center of Nanoscience and Nanotechnology Research, Wuhan University, Wuhan 430072
A Sign Alternation of Nonlinear Absorption in Gold Composite Films in Z-Scan
CHEN Dai-Jian1 ;DING Sha1 ;HAN Jun-Bo1 ;ZHOU Hui-Jun1 ;XIAO Si1 ;XIONG Gui-Guang1 ;WANG Qu-Quan1,2
1 Department of Physics, Wuhan University, Wuhan 430072
2 Center of Nanoscience and Nanotechnology Research, Wuhan University, Wuhan 430072
关键词 ：
42.65.An ,
42.70.Nq ,
81.15.Cd
Abstract ： Au--TiO2 composite films with Au atom content varying from about 15% to 82% are prepared by co-sputtering technique. Both open- and closed-aperture Z-scan of the samples are performed in the femtosecond time region. A conversion of the nonlinear absorption from negative to positive is observed as the Au atom content increases due to the saturation of reverse saturable absorption. The nonlinear refractive index γ and effective nonlinear absorption coefficient βeff at the Au atom content of 54% are measured to be 1.6×10-2 cm2 /GW and -2.6×103 cm/GW, respectively. The corresponding third-order optical nonlinearity x(3) is about 6.3×10-8 esu.
Key words ：
42.65.An
42.70.Nq
81.15.Cd
出版日期: 2005-09-01
:
42.65.An
(Optical susceptibility, hyperpolarizability)
42.70.Nq
(Other nonlinear optical materials; photorefractive and semiconductor materials)
81.15.Cd
(Deposition by sputtering)
引用本文:
CHEN Dai-Jian;DING Sha;HAN Jun-Bo;ZHOU Hui-Jun;XIAO Si;XIONG Gui-Guang;WANG Qu-Quan;. A Sign Alternation of Nonlinear Absorption in Gold Composite Films in Z-Scan[J]. 中国物理快报, 2005, 22(9): 2286-2289.
链接本文:
https://cpl.iphy.ac.cn/CN/
或
https://cpl.iphy.ac.cn/CN/Y2005/V22/I9/2286
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2005, Vol. 22 
