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11 January 2011 State-filling and self-action processes at resonant excitation of excitons in colloidal quantum dots
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Proceedings Volume 7993, ICONO 2010: International Conference on Coherent and Nonlinear Optics; 79931R (2011) https://doi.org/10.1117/12.881197
Event: International Conference on Coherent and Nonlinear Optics (ICONO 2010) and International Conference on Lasers, Applications and Technologies (LAT 2010), 2010, Kazan, Russian Federation
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.
© (2011) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
V. Dneprovskii, M. Kozlova, T. Wumaier, E. Zhukov, Sy Hieu Dau, and A. Smirnov "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 (11 January 2011); https://doi.org/10.1117/12.881197
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