Abstract
Mesoporous silica thin films loaded with gold nanoparticles are synthesized
in the presence of EO<sub>20</sub>PO<sub>70</sub>EO<sub>20</sub> (P123). Transmission electron microscope images show
that the matrix of the nanocomposite is an ordered porous structure with a
two-dimensional hexagonal phase. The wide-angle X-ray diffraction pattern implies
that the nanocomposite contains gold crystals. These metallic nanoparticle-embedded
solid thin films show some linear and nonlinear optical properties due to their
special structure and composition. Gold nanoparticles bring about surface plasmon
resonance, and an absorption peak stemming from this effect has been observed. The
linear absorption property is analyzed by a quantum mechanism, and the results show
that it is in°uenced by the size and volume fraction of gold nanoparticles.
Furthermore, it shows an obviously clear nonlinear optical property measured by the
<i>z</i> -scan technique. The magnitude of the nonlinear refractive index of the
nanocomposite is estimated to be about 10<sup>-10</sup> cm<sup>2</sup>/W.
© 2012 Chinese Optics Letters
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