| Original Articles |
|
|
|
|
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 |
| 1Department of Physics, Wuhan University, Wuhan 430072
2Center of Nanoscience and Nanotechnology Research, Wuhan University, Wuhan 430072 |
|
| Cite this article: |
|
CHEN Dai-Jian, DING Sha, HAN Jun-Bo et al 2005 Chin. Phys. Lett. 22 2286-2289 |
|
|
|
|
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 1.6×10-2cm2/GW and -2.6×103cm/GW, respectively. The corresponding third-order optical nonlinearity x(3) is about 6.3×10-8esu.
|
| Keywords:
42.65.An
42.70.Nq
81.15.Cd
|
|
|
Published: 01 September 2005
|
|
| PACS: |
42.65.An
|
(Optical susceptibility, hyperpolarizability)
|
| |
42.70.Nq
|
(Other nonlinear optical materials; photorefractive and semiconductor materials)
|
| |
81.15.Cd
|
(Deposition by sputtering)
|
|
|
|
|
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
