This article is cited in 11 papers

Semiconductor structures, low-dimensional systems, quantum phenomena

Nonlinear optical properties of CdS/ZnS quantum dots in a high-molecular-weight polyvinylpyrrolidone matrix

A. S. Kulagina^ab, S. K. Evstropiev^bc, N. N. Rosanov^bcd, V. V. Vlasov<sup>b

a</sup> Federal State Budgetary Institution of Higher Education and Science Saint Petersburg National Research Academic University of the Russian Academy of Sciences, St. Petersburg
^b St. Petersburg National Research University of Information Technologies, Mechanics and Optics
^c All-Russian Research Center "S. I. Vavilov State Optical Institute", St. Petersburg
^d Ioffe Institute, St. Petersburg

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.

Received: 12.09.2017
Accepted: 26.09.2017

DOI: 10.21883/FTP.2018.08.46211.8724

 English version: Semiconductors, 2018, 52:8, 997–1003

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