Open AccessThe optical and nonlinear optical properties of Au:TiO2 and Au:Al2O3 composite films
Author(s) -
Bo Zhu,
Fangfang Wang,
Zhang Kun,
Guohong Ma,
Yuzong Gu,
Lijun Guo,
Shixiong Qian
Publication year - 2008
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.57.3085
Subject(s) - surface plasmon resonance , materials science , nanoparticle , composite number , permittivity , wavelength , resonance (particle physics) , substrate (aquarium) , plasmon , spectroscopy , surface plasmon , optoelectronics , nanotechnology , dielectric , composite material , physics , atomic physics , oceanography , quantum mechanics , geology
On the basis of measurement and theoretical analysisoptical and nonlinear optical properties of the AuTiO2 and AuAl2O3 composite films with different Au nanoparticle size and different substrates were investigated. The relationship between the Au nanoparticle size and substrates and the surface plasmon resonance (SPR) of Au composite films were characterized by UV-VIS-NIR spectroscopyand the dependence of third-order nonlinear susceptibility of the composite films on Au nanoparticle size and substrates was investigated by picosecond Z-scan technique with different exciting wavelengths (532nm and 1064nm). The analysis of optical properties of these films was carried out using the theories of surface plasmon resonance and localized field enhancementrespectively. The experimental and theoretical results revealed the dependence of third-order nonlinear susceptibilities χ(3) on Au nanoparticle size and substrates. For Au nanoparticle of size around 35nm embedded in TiO2 substrate with larger permittivity and the exciting wavelength at 532nm close to the surface plasmon resonance (618nm—632nm)the third-order nonlinear susceptibility χ(3) showed a maximum value of 25×10-9esu.