Masia, Francesco  ORCID: https://orcid.org/0000-0003-4958-410X, Moreels, Iwan, Hens, Zeger, Langbein, Wolfgang Werner ORCID: https://orcid.org/0000-0001-9786-1023 and Borri, Paola ORCID: https://orcid.org/0000-0002-7873-3314
2010.
Four-wave-mixing imaging and carrier dynamics of PbS colloidal quantum dots.
Physical Review B
82
(15)
, 155302.
10.1103/PhysRevB.82.155302
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Abstract
We demonstrate coherent multiphoton imaging of PbS colloidal quantum dots based on the detection of their transient resonant four-wave-mixing (FWM) emission under 150 fs pulsed laser excitation. Background-free imaging of PbS quantum dots in resonance with their ground-state excitonic absorption at 1.2 μm wavelength is shown, with intrinsic optical sectioning and a spatial resolution better than the one-photon diffraction limit, promising for deep tissue microscopy. The four-wave-mixing efficiency is found to be resonant to the ground-state absorption maximum, which is a prerequisite for spectral multiplexing. The measured FWM dynamics is consistent with the presence of charged exciton and biexiton Auger recombination in the 10–100 ps time scale, phonon-assisted exciton thermalization in the nanosecond time scale, and excitonic recombination in the microsecond time scale.
| Item Type: | Article |
|---|---|
| Date Type: | Publication |
| Status: | Published |
| Schools: | Schools > Biosciences Schools > Physics and Astronomy |
| Subjects: | Q Science > Q Science (General) Q Science > QC Physics |
| Uncontrolled Keywords: | 9 pp. |
| Publisher: | American Physical Society |
| ISSN: | 1098-0121 |
| Funders: | EPSRC |
| Last Modified: | 13 May 2023 01:44 |
| URI: | https://orca.cardiff.ac.uk/id/eprint/22815 |
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