  We report the fabrication of diverse light guiding structures embedded in
oxidised porous silicon (OPS) by means of patterned pore filling through a
single photoresist mask. The pores of OPS were filled with KDP salt from
unsaturated solution applied on the sample's surface. Photolithography was used
to create the mask. The created structures include straight, bent and tapered
waveguides of different widths, and Y-splitters. Light guiding was demonstrated
and characterised at wavelength of 1.064 microns.
