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The small sized Au/Ag2Se core/shell nanoparticles are synthesized in the organic environment. This nanostructure has a good nonlinear figures of merit. The changes of the plasmon absorption peak of the samples are obtained by UV-Vis spectrophotometer. The Au/Ag2Se core/shell nanoparticles exhibit fascinating nonlinear optical properties which are studied by using Z-scan technology. The nonlinear absorption coefficient β and nonlinear refractive index γ show regular changes from Au to Au/Ag2Se core/shell nanoparticles. This also caused that their one-photon figures of merit W increase and the two-photon figures of merit T decrease. Finally, the figures of merit W = 4.15 and T = 0.58 of the Au/Ag2Se core/shell nanoparticles satisfy the demand of the application of all-optical switch.

Good Nonlinear Figures of Merit of Au/Ag2Se Core/Shell Nanostructures with Small Size