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Journal of Sol-Gel Science and Technology

, Volume 26, Issue 1–3, pp 891–896 | Cite as

Optical Nanocomposite Planar Waveguides Doped with Rare-Earth and Noble Metal Elements

  • Rui M. Almeida
  • Ana C. Marques
  • Maurizio Ferrari
Article

Abstract

The present paper is focused on multilayer Er3+-doped silica-titania planar waveguides, co-doped with silver, which were prepared by spin-coating on silica glass, or buffered single crystal silicon substrates. The single layer thickness (∼0.4 μm) and refractive index (∼1.60–1.63) were measured by spectroscopic ellipsometry at 715 nm. The thickness of the waveguides (measured by mechanical profilometry) was ∼1 μm and their optical propagation losses were measured at different laser wavelengths (488 nm, 514 nm and 633 nm), exhibiting an approximately Rayleigh-like behavior. The thermal precipitation of silver nanocrystallites was achieved, both in air and under a controlled atmosphere (dry nitrogen) and these were characterized by visible absorption spectroscopy, which clearly showed the development of a plasmon absorption band near 415 nm, by X-ray diffraction (XRD) and Transmission Electron Microscopy (TEM). The Er3+ metastable level lifetimes for the emission at ca. 1.54 μm were found to be ca. 4–6 ms, for Er3+ concentrations varying between 0.2–2.0 mol% (or ∼(0.4–4.4) × 1020 ions/cm3), but no significant variation was observed with the Ag concentration added (up to 2.5 mol%).

sol-gel planar waveguides silver nanoparticles Er doping fluorescence lifetime 

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Copyright information

© Kluwer Academic Publishers 2003

Authors and Affiliations

  • Rui M. Almeida
  • Ana C. Marques
  • Maurizio Ferrari

There are no affiliations available

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