Authors: D.M. Popovic
Affilation: Faculty of Physics, University of Belgrade, Serbia
Pages: 208 - 210
Keywords: silicon nanoparticles, laser ablation in liquid, picosecond laser, continuous laser, photoluminescence (PL)
Silicon nanoparticle (Si-NPs) is attracting attention of authors in numerous fields of science. The photoluminescence properties of Si-NPs make them a candidate for biomaging applications. The one of the most promising and the simplest method for the producing of Si-NPs is the laser ablation of solid target in liquid (LAL). The Nd:YAG laser at wavelengths of 1064 nm was employed for 15 minutes and the additional green continuous (CW) laser was applied during the LAL process and for 15 minutes immediately prior to the application of the pulse laser. Single crystalline silicon plates were placed in a container filled with 5ml of de-ionized water. We demonstrated that the size distribution of NPs prepared by LAL is shifting the distribution maximum to smaller values due to the application of the CW laser The photoluminescence spectra of produced silicon NPs in de-ionized water were recorded for excitation at 270 nm and 300 nm. We demonstrated that the applying of the CW laser during LAL induce the change of shape and intensity of the PL spectra.