Four-wave-mixing imaging and carrier dynamics of PbS colloidal quantum dots

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:	Biosciences 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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