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Energy level scheme of single- (left) and two- (right) photon excitation in a QD using photons with linear or circular polarization (a). Full range PL of the sample under investigation using 532 nm excitation (b).
Pump power dependent SHB spectra with excitation intensities spanning from 50 to . Inset: intensity dependence of spectral hole labeled .
SHB response for high pump intensities. Polarization of pump/probe: linear/linear (solid with visible peak), Circular/Linear (solid without visible peak) line). Pump pulse (dashed peak centered at ), TPA spectral hole (dashed dashed peak center at ). Fit of Lin/Lin spectrum with Circ/Lin and TPA spectral hole (dotted). are the transition energies of the . Inset: difference between black and red curve showing SE hole as well as hole.
PL recorded under pulsed two-photon excitation at energies above the single-photon resonance. Inset: power dependence of the QD luminescence under pulsed two-photon excitation.
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