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Fabrication and characterisation of a CdS-doped silica-on-silicon planar waveguide

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7 Author(s)
Fardad, M.A. ; Dept. of Electr. & Electron. Eng., Imperial Coll. of Sci., Technol. & Med., London, UK ; Yeatman, E.M. ; Dawnay, E.J.C. ; Green, M.
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A planar silica-titania waveguide doped with CdS nanocrystallites has been fabricated on a silicon substrate. A passive nanoporous host layer and a pure silica buffer layer, of thickness 2.2 and 7.5 μm, respectively, were deposited by the sol-gel technique. Crystallites were then precipitated in the porous matrix by soaking in a CdF2 solution followed by reaction in H2S gas, and a sputtered layer of silica was used to seal the structure. The absorption spectrum of an equivalent film indicates crystallites with radii up to ~26 Å, while energy dispersion spectroscopy indicates a dopant concentration of ~0.5 volume%. The third order optical nonlinearity (Kerr effect) was measured using an m-line technique, yielding a value of ~5×10-9 cm2/kW

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Optoelectronics, IEE Proceedings -  (Volume:143 ,  Issue: 5 )