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.
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Original Russian Text © A.S. Kulagina, S.K. Evstropiev, N.N. Rosanov, V.V. Vlasov, 2018, published in Fizika i Tekhnika Poluprovodnikov, 2018, Vol. 52, No. 8, pp. 865–872.
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Kulagina, A.S., Evstropiev, S.K., Rosanov, N.N. et al. Nonlinear Optical Properties of CdS/ZnS Quantum Dots in a High-Molecular-Weight Polyvinylpyrrolidone Matrix. Semiconductors 52, 997–1003 (2018). https://doi.org/10.1134/S1063782618080110
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DOI: https://doi.org/10.1134/S1063782618080110