Photodynamics of Nonlinear Effects of Picosecond Laser Action on CdSe/ZnS QDs Colloidal Solutions

The intensity of incident radiation on photodynamics of nonlinear processes in colloidal solutions of CdSe/ZnS quantum dots is investigated. The difference between nonlinear processes that occur during and after the action of a laser pulse is established and studied experimentally. Analysis of lumin...

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Bibliographic Details
Published inOptics and spectroscopy Vol. 125; no. 5; pp. 716 - 721
Main Authors Danilov, V. V., Kulagina, A. S., Sibirev, N. V., Khrebtov, A. I., Shilov, V. B.
Format Journal Article
LanguageEnglish
Published Moscow Pleiades Publishing 01.11.2018
Springer Nature B.V
Subjects
Cadmium selenides
Colloiding
Deactivation
Incident radiation
Lasers
Nanophotonics
Optical Devices
Optics
Photonics
Physics
Physics and Astronomy
Quantum dots
Zinc sulfide
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Summary:The intensity of incident radiation on photodynamics of nonlinear processes in colloidal solutions of CdSe/ZnS quantum dots is investigated. The difference between nonlinear processes that occur during and after the action of a laser pulse is established and studied experimentally. Analysis of luminescence kinetics during the laser action showed that an increase in intensity leads not only to the effect of optical limiting but also to the appearance of superradiance for quantum dots of different diameters. The pump−probe experiments revealed the effect of a “dynamic valve” caused by an interference of two processes, relaxation via dimensionally quantized levels and phononless relaxation via surface or dark states, at the stage following laser excitation. Mathematical model of deactivation of the highly excited states formulated in the form of Riccati equations showed good agreement with the experiment of Picosecond Laser Action on CdSe/ZnS QDs Colloidal Solutions.
ISSN:0030-400X
1562-6911
DOI:10.1134/S0030400X18110097