We report the experimental study of changes in optical properties of oxidised porous silicon induced by pore filling with salts from aqueous solutions. Our experiments demonstrate that pore filling is a simple and effective method for tuning the refractive index of porous silicon, which can be applied locally. This method can be used for creation of waveguides and other planar optical components. Our results correlate with previously reported works on the subject and provide information, which can be useful for the future investigation of porous materials.
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