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(Color online) The absorption spectra of CdSe cores and CdSe/CdS core/shell NCs. The insets show the TEM and HRTEM images of the CdSe cores (a) and CdSe/CdS NCs (4 MLs) (b).
Measured CA (a), OA (b), and CA/OA (c), Z-scans of toluene (△), CdSe cores (○), and CdSe/CdS NCs (3 MLs) (▽). The black solid lines are the fitting curves by the Z-scan theoretical formulae of Ref. 14.
The χ(3), Reχ(3), and Imχ(3) values of these six samples. The inset shows Reχ(3) alone to illustrate its variation clearly.
The theoretically calculated effective nonlinear susceptibility according to the local field theory. The solid dots are the experimentally data.
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