Silicon nanoparticles were produced by sequential use of techniques of electrochemical etching and picosecond laser ablation in distilled water, ethanol and liquid nitrogen. Ensembles of the nanoparticles formed in two last cases exhibit effective photoluminescence with a peak get into the diagnostic window of biotissue transparency (700–1300 nm). Optical characteristics of the obtained silicon nanoparticle suspensions were studied by the spectrophotometry technique. It was shown that the examined suspensions possess the light scattering coefficients which are sufficient for their use as contrast agents in the optical coherence tomography.
68.37.Ps Atomic force microscopy
78.55.-m Photoluminescence, properties and materials
61.46.-w Structure of nanoscale materials
$^1$Moscow State University, Physics Faculty, Department of General Physics and Molecular Electronics, chair of General Physics and Molecular Electronics.\
$^2$Department of General Physics, Faculty of Physics, M.V.Lomonosov Moscow State University, chair of General Physics .\
$^3$Institute of Applied Physics RAS\
$^4$Lobachevsky Nizhni Novgorod National Research University
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