2010
DOI: 10.1021/nl1018673
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Abstract: The influence of quantum confinement on the one- and two-photon absorption spectra (1PA and 2PA) of PbS and PbSe semiconductor quantum dots (QDs) is investigated. The results show 2PA peaks at energies where only 1PA transitions are predicted and 1PA peaks where only 2PA transitions are predicted by the often used isotropic k x p four-band envelope function formalism. The first experimentally identified two-photon absorption peak coincides with the energy of the first one photon allowed transition. This first … Show more

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Cited by 50 publications
(55 citation statements)
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“…1, and also seen in the second derivative) is attributed to the formally parity-forbidden 1P h →1S e and 1S h →1P e transitions, which have been shown to become increasingly allowed in smaller lead-salt QDs. 29 The temporal evolution of the depletion of the 1P h →1P e and 1S h →1S e transition is shown in Figs. 2(a) and 2(b) as a function of the QD size.…”
Section: A Carrier Dynamicsmentioning
confidence: 99%
“…1, and also seen in the second derivative) is attributed to the formally parity-forbidden 1P h →1S e and 1S h →1P e transitions, which have been shown to become increasingly allowed in smaller lead-salt QDs. 29 The temporal evolution of the depletion of the 1P h →1P e and 1S h →1S e transition is shown in Figs. 2(a) and 2(b) as a function of the QD size.…”
Section: A Carrier Dynamicsmentioning
confidence: 99%
“…Z-Scan curves of the Au NPs/glass sample recorded at 720 nm. a) and b) are representative CA and OA raw Z-Scans traces (Dots) and theoretical fits (Lines) respectively, where z represents the sample position along z axis and z0 is the Rayleigh diffraction length of laser beam40 The Z-scan measurement is a simple and widely applied technique used to measure both the sign and magnitude of the third-order nonlinear refraction index n 2 and absorption coefficient β via the "open" aperture (OA) and "closed" aperture 45 (CA) methods 24. It measures the optical nonlinearities through detecting the far-field sample transmittance of a focused Gaussian beam as a function of sample position.…”
mentioning
confidence: 99%
“…1S1P) increases due to an increase in the structural asymmetry. 34 As a result, the probability of excitation to the 1P state via a 1S1P transition should increase with decreasing NC size. Thus, the likelihood of photocharging may increase for smaller sized NCs.…”
Section: Resultsmentioning
confidence: 99%