Broadband NIR Emission in Sol–Gel Er3+-Activated SiO2–Ta2O5 Glass Ceramic Planar and Channel Waveguides for Optical Application
Abstract:An Er3+-doped SiO2:Ta2O5 optical channel waveguide and nanocomposite were prepared by the sol–gel route at a Si:Ta 50:50 molar ratio. Channels with an excellent surface profile were easily and quickly fabricated by focusing a femtosecond laser onto the surface of multilayered films deposited on SiO2/Si substrates. In parallel, the same sol used to prepare the film was annealed at 900, 1000, and 1100 °C for 2 h, to get the nanocomposite materials. A broadband NIR emission around 1538 nm, assigned to the 4I13/2 → 4I15/2 transition of the Er3+ ions was observed in the nanocomposites of amorphous SiO2 containing dispersed Ta2O5 nanocrystals. The 4I13/2 lifetime and emission bandwidth depend on the annealing temperature. In conclusion, Er3+-doped SiO2:Ta2O5 channel waveguides and nanocomposites are promising materials for photonic applications.
Document Type: Short Communication
Publication date: March 1, 2011
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