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Proceedings Article

State-filling and self-action processes at resonant excitation of excitons in colloidal quantum dots

[+] Author Affiliations
V. Dneprovskii, M. Kozlova, T. Wumaier, E. Zhukov, Sy Hieu Dau, A. Smirnov

M.V. Lomonosov Moscow State Univ. (Russian Federation)

Proc. SPIE 7993, ICONO 2010: International Conference on Coherent and Nonlinear Optics, 79931R (January 11, 2011); doi:10.1117/12.881197
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From Conference Volume 7993

  • ICONO 2010: International Conference on Coherent and Nonlinear Optics
  • Kazan, Russian Federation | August 23, 2010

abstract

The anomalous nonlinear absorption of colloidal CdSe/ZnS quantum dots has been revealed in the case of resonant excitation of the basic exciton transition by powerful picosecond light pulses: bleaching at moderate input intensities is substituted by retardation of bleaching rate and even by increasing of absorption. The latter has been explained by saturation (state-filling) effect of two-level system with decreasing lifetime of the excited state at high excitation because of Auger recombination. The observed changes of output intensity cross-section profile versus exciting intensity were attributed to the creation of transparency channel in the cell with highly absorbing colloidal solution of quantum dots by laser beam due to state-filling, strip-effect and finally self-diffraction of Fresnel or Fraunhofer type by induced aperture.

© (2010) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

V. Dneprovskii ; M. Kozlova ; T. Wumaier ; E. Zhukov ; Sy Hieu Dau, et al.
"State-filling and self-action processes at resonant excitation of excitons in colloidal quantum dots", Proc. SPIE 7993, ICONO 2010: International Conference on Coherent and Nonlinear Optics, 79931R (January 11, 2011); doi:10.1117/12.881197; http://dx.doi.org/10.1117/12.881197


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