Nonlinear refractive index of the gold nanoparticle/silicon quantum dot hybrid structure

The nonlinear refractive index n(2) of hybrid structure composed of metal nanoparticle, Au, and a silicon quantum dot is measured and calculated by means of experimental and theoretical methods, respectively. Experimentally, gold nanoparticles are prepared by laser ablation in liquid method and Si quantum dot by liquid jet method. By using Z-scan technique, the mixture of them is exposed by 532 nm pump light, in close aperture configuration, to obtain the nonlinear refractive index. Moreover, hybrid structure is modeled, and the third-order nonlinear susceptibility chi(3) is calculated by the local field theory. Our results show enhanced third-order nonlinear susceptibility chi(3) and as a result nonlinear refractive index of the sample in the presence of the gold nanoparticles theoretically by the extracted nonlinearity experimentally.

Automated summary

The nonlinear refractive index of a hybrid structure composed of metal nanoparticles (Au) and silicon quantum dots was measured and calculated using experimental and theoretical methods. Gold nanoparticles were prepared by laser ablation in liquid, and Si quantum dots were prepared by liquid jet method. The mixture of them was exposed to 532 nm pump light using the Z-scan technique to obtain the nonlinear refractive index. Additionally, the hybrid structure was modeled and the third-order nonlinear susceptibility was calculated. The results showed an enhancement in the third-order nonlinear susceptibility and consequently the nonlinear refractive index of the sample in the presence of gold nanoparticles.