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Large third-order optical nonlinearity in Cu-doped SrBi2Nb2O9 thin films
Published online by Cambridge University Press: 08 August 2007
Abstract
Copper-doped SrBi2Nb2O9 (SBN) thin films
have been fabricated on fused quartz substrates at room temperature by RF
magnetron sputtering technique. The chemical composition and Cu
concentration in the deposited films were characterized by X-ray
fluorescence spectrometer. XRD analysis indicated that the films have a
single phase of layered perovskite structure and Cu doping in SBN films did
not degrade their crystallinity at the dopant concentration of 9.5%. The
nonlinear optical properties of the samples were determined using a single
beam z-scan technique at a laser wavelength of 532 nm with laser duration of
25 ps. The results showed that the value of $\chi ^{(3)}$ of Cu-doped SBN films is about twice larger than that of the undoped, which is comparable
with that of some representative nonlinear optical materials, indicating
that metal-doping in dielectric is effective to enhance their nonlinear
optical properties. This suggests that Cu-doped SBN films have great
potential in designing nonlinear optical devices.
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- © EDP Sciences, 2007
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