Nonlinear Optical Properties of CdS/ZnS Quantum Dots in a High-Molecular-Weight Polyvinylpyrrolidone Matrix
- Authors: Kulagina A.S.1,2, Evstropiev S.K.2,3, Rosanov N.N.2,3,4, Vlasov V.V.2
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Affiliations:
- St. Petersburg National Research Academic University
- St. Petersburg National Research University of Information Technologies, Mechanics, and Optics
- Joint-Stock Company “Vavilov GOI”
- Ioffe Institute
- Issue: Vol 52, No 8 (2018)
- Pages: 997-1003
- Section: Semiconductor Structures, Low-Dimensional Systems, and Quantum Phenomena
- URL: https://journals.rcsi.science/1063-7826/article/view/203817
- DOI: https://doi.org/10.1134/S1063782618080110
- ID: 203817
Cite item
Abstract
Sols containing core/shell CdS/ZnS semiconductor quantum dots are synthesized and their nonlinear properties, which are interesting for a large variety of applications in nanophotonics, are studied. The quantum dots produced are smaller in dimensions than the exciton Bohr radius and, therefore, exhibit a well-pronounced quantum-confinement effect. The nonlinear optical properties of low-concentration sols are studied upon exposure to laser pulses with an emission wavelength of 532 nm and a duration of 5 ns by the z-scan technique. The dependences of nonlinear optical coefficients on the concentration of CdS/ZnS quantum dots are obtained. The intensity dependence of two-photon absorption coefficients is presented. The dependence determines the boundary of the influence of high-order nonlinearities on the nonlinear transmittance of the samples. The mechanisms of optical limitation exhibited by sols, specifically, two-photon absorption, nonlinear refraction, and nonlinear scattering are discussed.
About the authors
A. S. Kulagina
St. Petersburg National Research Academic University; St. Petersburg National Research University of Information Technologies, Mechanics, and Optics
Author for correspondence.
Email: a.s.panfutova@gmail.com
Russian Federation, St. Petersburg, 194021; St. Petersburg, 197101
S. K. Evstropiev
St. Petersburg National Research University of Information Technologies, Mechanics, and Optics; Joint-Stock Company “Vavilov GOI”
Email: a.s.panfutova@gmail.com
Russian Federation, St. Petersburg, 197101; St. Petersburg, 199053
N. N. Rosanov
St. Petersburg National Research University of Information Technologies, Mechanics, and Optics; Joint-Stock Company “Vavilov GOI”; Ioffe Institute
Email: a.s.panfutova@gmail.com
Russian Federation, St. Petersburg, 197101; St. Petersburg, 199053; St. Petersburg, 194021
V. V. Vlasov
St. Petersburg National Research University of Information Technologies, Mechanics, and Optics
Email: a.s.panfutova@gmail.com
Russian Federation, St. Petersburg, 197101