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Semiconductors

, Volume 52, Issue 8, pp 997–1003 | Cite as

Nonlinear Optical Properties of CdS/ZnS Quantum Dots in a High-Molecular-Weight Polyvinylpyrrolidone Matrix

  • A. S. Kulagina
  • S. K. Evstropiev
  • N. N. Rosanov
  • V. V. Vlasov
Semiconductor Structures, Low-Dimensional Systems, and Quantum Phenomena
  • 14 Downloads

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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Copyright information

© Pleiades Publishing, Ltd. 2018

Authors and Affiliations

  • A. S. Kulagina
    • 1
    • 2
  • S. K. Evstropiev
    • 2
    • 3
  • N. N. Rosanov
    • 2
    • 3
    • 4
  • V. V. Vlasov
    • 2
  1. 1.St. Petersburg National Research Academic UniversityRussian Academy of SciencesSt. PetersburgRussia
  2. 2.St. Petersburg National Research University of Information Technologies, Mechanics, and OpticsSt. PetersburgRussia
  3. 3.Joint-Stock Company “Vavilov GOI”St. PetersburgRussia
  4. 4.Ioffe InstituteSt. PetersburgRussia

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