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Proceedings Paper

State-filling and self-action processes at resonant excitation of excitons in colloidal quantum dots
Author(s): V. Dneprovskii; M. Kozlova; T. Wumaier; E. Zhukov; Sy Hieu Dau; A. Smirnov
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Paper 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.

Paper Details

Date Published: 12 January 2011
PDF: 8 pages
Proc. SPIE 7993, ICONO 2010: International Conference on Coherent and Nonlinear Optics, 79931R (12 January 2011); doi: 10.1117/12.881197
Show Author Affiliations
V. Dneprovskii, M.V. Lomonosov Moscow State Univ. (Russian Federation)
M. Kozlova, M.V. Lomonosov Moscow State Univ. (Russian Federation)
T. Wumaier, M.V. Lomonosov Moscow State Univ. (Russian Federation)
E. Zhukov, M.V. Lomonosov Moscow State Univ. (Russian Federation)
Sy Hieu Dau, M.V. Lomonosov Moscow State Univ. (Russian Federation)
A. Smirnov, M.V. Lomonosov Moscow State Univ. (Russian Federation)


Published in SPIE Proceedings Vol. 7993:
ICONO 2010: International Conference on Coherent and Nonlinear Optics

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