Low-Dimensional Systems and Surface Physics

Physics of the Solid State

, Volume 49, Issue 2, pp 366-370

First online:

Nonlinear absorption and refraction of light in a colloidal solution of CdSe/ZnS quantum dots upon two-photon resonant excitation

  • V. S. DneprovskiĭAffiliated withMoscow State University
  • , E. A. ZhukovAffiliated withMoscow State University
  • , D. A. KabaninAffiliated withMoscow State University
  • , V. L. LyaskovskiĭAffiliated withMoscow State University
  • , A. V. RakovaAffiliated withMoscow State University
  • , T. WumaierAffiliated withMoscow State University

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This paper reports on the results of an investigation into the nonlinear transmission of individual ultrashort pulses of a train generated by a mode-locked laser through a colloidal solution of CdSe/ZnS quantum dots in toluene upon two-photon resonant excitation of the fundamental optical transition. The specific features of the nonlinear transmission are explained in terms of the two-photon absorption and self-defocusing processes. Analysis of the experimental results makes it possible to separate the self-defocusing processes that are governed by the inertialess change in the refractive index due to the interaction of high-power optical pulses with bound electrons and those determined by the nonlinear change in the refractive index under the action of two-photon-excited carriers in a quantum dot.

PACS numbers

73.21.La 42.65.-k