Good Nonlinear Figures Of Merit Of Au/Ag2se Core/Shell Nanostructures With Small Size

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 beta and nonlinear refractive index gamma show regular changes from Auto 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.