PACS: 78.30.Jw, 78.67.Bf, 81.05.Rm Mesoporous silicon layers, realised by electrochemical anodisation of p + silicon substrates were completely oxidised and then impregnated by Disperse Red 1 (referred to as DR1) molecules dissolved in various solvents: butanol, propanol and THF. The formed composite materials were characterised by the "m-lines", micro-Raman spectrometry and optical reflectivity measurements. Raman investigations show that DR1 is uniformly distributed inside the porous layer and that the DR1 quantity is the highest when THF solvent is used. The refractive index evolution is in agreement with the DR1 quantities detected by Raman analysis.

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PACS Single porous silicon layers (60%, 70% and 80% porosity) and double porous silicon layers with two different porosities (80%-73% and 73%-80%) were completely oxidised and then filled by Disperse Red One molecules (referred to as DR1). The formed composite materials were characterised by optical reflectivity measurements and micro-Raman spectrometry in order to probe the DR1 relative concentration profile along the porous layers. In the single layers, the Raman signals linearly increase with porosity starting from a critical value (estimated at 40% before oxidation). On the contrary, in the case of double layer systems, the DR1 filling was always higher in the low porosity layer.