Abstract
A method for oxidising porous silicon to obtain thick SiO2 as the cladding layer of silicon-based silica waveguides is presented. The experimental results of oxidation are given. The following conclusions are drawn: the oxidation rate of porous silicon is several orders higher than that of bulk silicon, the appropriate temperature variation rate during oxidation combined with proper porosity can prevent SiO2 on silicon substrates from cracking. and a 25 mu M thick silicon dioxide layer has been obtained.
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