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TEM and HRTEM (inset) representative micrographs of CdSe QDs from chloroform solution showing the size uniformity and crystallinity of the dots.
(Color online) Representative OA and CA raw Z-Scans traces at 800 nm (black symbols) and the theoretical fits (red lines) for CdSe QDs with 3.2 and 4.2 nm size, respectively.
(Color online) Dispersion of the real and imaginary parts of the complex hyperpolarizability γ of CdSe QDs with 3.2 and 4.2 nm size determined from Z-scan measurements in chloroform solutions containing 1.5% w/w of the NPs.
(Color online) Dispersion of the effective two-photon absorption cross section (taken per an individual NP) and comparison to one-photon absorption spectra (right-hand blue scale) of CdSe QDs with size 3.2 and 4.2 nm, respectively.
Comparison of two-photon absorption coefficient β and effective two-photon absorption cross section σ2 for colloidal solution of CdSe QDs estimated by the use of femtosecond laser pulses.
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