Femtosecond laser ablation of TiO2 films for two-dimensional photonic crystals
Femtosecond laser ablation of TiO2 thin films was studied as a function of laser pulse energy and number of pulses. The ablated holes were characterized by atomic force microscopy and the optimum irradiation conditions were chosen for producing a periodic structure of triangular lattice of air holes in the TiO2 films. A photonic structure with period of 1.5 μm was designed to show photonic band gap in the near-infrared, at the telecommunication
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