ZnO has been researched for its excellent properties for optoelectronic, sensing, piezoelectric
application, solar cells, light emitting diodes and laser diodes. Transparent oxide semiconductor (TOS) thin
films made of ZnO nanocomposites, which are used as transparent electrodes in optoelectronic devices, have
been widely reported. Among the TOSs, the thin films of a homologous compound, with a so-called
superlattice structure have attracted considerable interest. Because of the spatial confinement of conductive
electrons in the two dimensional layer, their interesting electronic, optical, and magnetic properties, along
with small size and chemical reactivity, have led to a wide range of applications in nano-optoelectronics,
medical diagnostics, catalysis, and chemical sensing. In this paper, the ultrafast dynamics and the nonlinear
optical response of metal nanocomposites were investigated. Heat treatment has been proven to be a feasible
way to improve the performance of ultrafast response for this kind of materials. Based on the experimental
results of In-doped ZnO materials excited by intense fs pulses near 800 nm, nonlinear optical effects that
may emerge under an intense field are attributed to be responsible for the efficient two-photon absorption
process under detuned excitation.
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