Abstract
We show that the laser ablation method can be efficiently employed for the synthesis of silicon nanoparticles (NP), which are characterized by a strong resonant optical response in the visible spectral range. A single layer composed of silicon NPs has been deposited from the colloidal solution generated by laser ablation. The formation of hybrid silicon-gold NPs as a result of the laser action on a mixed colloidal solution is observed. These hybrid NPs are characterized by broadening of the near-field photoluminescence spectra compared to pure silicon NPs. These results may be used for the realization of functional metasurfaces consisting of randomly distributed resonant NPs.
Highlights
Bulk silicon is an indirect gap semiconductor which is the rate of radiative recombination in silicon is orders of magnitude lower than in direct gap semiconductors, e.g. GaAs
In order to synthesize silicon NPs we have used the method of the CW-laser ablation[8, 9]
We have experimentally demonstrated that the CW-laser ablation can be used for the synthesis of silicon nanoparticles showing the resonant optical response features in the visible spectral range
Summary
Bulk silicon is an indirect gap semiconductor which is the rate of radiative recombination in silicon is orders of magnitude lower than in direct gap semiconductors, e.g. GaAs. Silicon NPs are characterised by remarkable photostability and allow for the wide-range tuning of the photoemission wavelength by altering the size of the nanoparticles For these reasons, silicon NPs have a very large application area in the visible and near IR ranges[1, 2]. The spontaneous ordering of NPs in the course of their deposition allows for the formation of thin films that may be used for creation of metasurfaces suitable for controllable manipulation of the transmission and reflectivity of light[6, 7] These results pave the way to applications of hybrid gold-silicon NPs in optical integrated circuits combining functions of generation, transmission and detection of optical signals
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