We present a theoretical analysis of the closed-aperture Gaussian beam Z-scan for nonlinear optical materials
with both saturable absorption and simultaneous third- and fifth-order nonlinear refraction. We formulate a
theoretical expression for the Z-scan transmittance by means of the Adomian’s decomposition method and the
thin film approximation. It is applied to the experimental characterization of the nonlinear optical properties of a
semiconductor CdSe quantum dot-polymer nanocomposite film. We show that measured results of the open- and
closed-aperture Z-scan transmittances of the nanocomposite film are well explained by the theoretical model.
We describe an experimental investigation of the nonlinear optical properties of nanocomposites incorporating
organic (hyperbranched polymer)-metallic (Au or Pt) nanoparticle complex embedded in polymer films. Zscan
techniques are employed to measure the effective third-order nonlinear optical susceptibilities χ(3)
eff of the
composites with 35 ps pulses at 532 nm. The relative sign of the real and imaginary parts of χ(3)
eff could be
explained qualitatively by the Kramers-Kronig relation. The third-order nonlinear optical susceptibilities of Au
and Pt nanoparticles from the measured values for χ(3)
eff were also determined to be (-5.48 + 4.76i)×10-8 and
(4.43 - 0.65i)×10-6 esu, respectively, at 532 nm.
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