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UV-visible absorption (thick solid line:—) spectrum together with the Gaussian fitting bands (dotted lines:⋯) of the ZnS QDs. The inset show the PL (dashed line:---) spectrum of the ZnS QDs.
Typical open-aperture Z scan measured at for the ZnS QDs. The symbols denote the experimental data while the solid line is the theoretically fitted curve employing the 3PA Z-scan theory in Ref. 18. The inset shows the plot of vs . The solid line represents the linear fit to the data.
(a) The intrinsic 3PA coefficients (solid squares) together with linear absorption (solid line:—) plotted as a function of wavelength for the ZnS QDs. (b) 2PA coefficients (solid circles) and 3PA coefficients (solid diamonds) plotted as a function of wavelength for the ZnS bulk, while the dashed (---) and dotted lines (⋯) are calculated from the 2PA theory of Sheik-Bahae et al. (Ref. 25) and 3PA theory of Brandi and de Araujo (Ref. 26), respectively. For comparison, the experimental results of our previous measurement (solid stars) (Ref. 18) and Catalano et al. (empty stars) (Ref. 20) are also displayed.
3PA of water-soluble ZnS QDs and ZnS bulk crystal. The relative errors are estimated as .
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