Abstract
Metallic microstructures were effectively precipitated by femtosecond laser irradiation into silver nitrate solution with TiO_2 nanoparticles. Femtosecond laser irradiation can induce nonlinear optical absorption, which enables to photo-reduction via multi-photon process only near the focal volume. The surfaces of the precipitated structures were relatively smooth, and the structurer had hemicircle-like cross-section. It was found that the cross-section area was as large as approximately 25 times compared to that of the solution without the nanoparticles. Additionally, maximum scanning speed was achieved to be 900 μm/s, which corresponds to 15 times higher than that of conventional solution. Such high photosensitivity, achieved even by small amount of TiO_2 nanoparticles, offer opportunities for further integration of hybrid micro-/nanodevices in nanophotonics.
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