Second- harmonic generation improved of hybrid nanostructures

Abstract

We provide the synthesis and characterization of semiconductor nanowire attached with metallic nanoparticles. The wires consist of zinc sulfide (ZnS) attached with gold nanoparticles (Au NPs). The nonlinear optical properties of the semiconductor nanowires are combined with the plasmonic of metallic nanoparticles (Au NPs) and offer an improved optical signal in the near infrared spectral range. The plasmonic of a metallic (Au NPs) offers the effect of locally improving the electric field of the incident light on the nanowire and consequently inducing a much stronger second harmonic generation (SHG) signal. By comparing SHG signals measured from bare ZnS NWs  and  ZnS –Au hybrid nanostructures we obtain  6 time improvement of the SHG intensity It is demonstrated that is ZnS NWs is an ideal candidate for nanolasers, nanoprobes especially for the ultraviolet region, nonlinear optical microscopy and nanophotonic.

Keywords: plasmonic nanostructures. Chemical synthesis, ZnS NWs,  Second - Harmonic generation (SHG).