Abstract Nanometre-sized gold particles embedded in BaTiO3 composite thin films (Au/BaTiO3) were fabricated by the pulsed laser deposition technique. The films were grown on MgO (100) substrates at 700℃. The crystalline property of the films was studied with x-ray diffraction. X-ray photoelectron spectroscopy was used to check the Au composition and chemical nature for the deposited films. The absorption peak due to the surface plasmon resonance of Au particles was observed at the wavelength of about 570 nm, which increased as the metal particle size was increased. The nonlinear optical properties of the Au/BaTiO3 films were determined using the z-scan method at the wavelength of 532 nm, which was close to the resonant frequency. The real and imaginary parts of the third-order nonlinear susceptibility $\chi$(3) at an Au concentration of about 6.7 at.% were determined to be 6.62×10-7 esu and -6.24×10-8 esu, respectively. The films showed a very large absorption, masking the nonlinear refraction effect at high metal concentrations.
Received: 03 July 2002
Revised: 12 August 2002
Accepted manuscript online:
(Other nonlinear optical materials; photorefractive and semiconductor materials)
Fund: Project supported by the National Natural Science Foundation of China (Grant No 5001161952).
Cite this article:
Wang Wei-Tian (王伟田), Yang Guang (杨光), Chen Zheng-Hao (陈正豪), Zhou Yue-Liang (周岳亮), Lü Hui-Bin (吕惠宾), Yang Guo-Zhen (杨国桢) Large third-order optical nonlinearity in Au nanometre particle doped BaTiO3 composite films near the resonant frequency 2002 Chinese Physics 11 1324
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