Перевод названия: State-filling and self-action processes at resonant excitation of excitons in colloidal quantum dots
Тип публикации: доклад, тезисы доклада, статья из сборника материалов конференций
Год издания: 2011
Идентификатор DOI: 10.1117/12.881197
Ключевые слова: Auger recombination, exciton, nonlinear absorption, quantum dot, Self-diffraction, State-filling effect, Strip-effect
Аннотация: 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 Показать полностьюbeen 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 SPIE.
Журнал: Proceedings of SPIE - The International Society for Optical Engineering
Выпуск журнала: 7993
Номера страниц: 79931
Место издания: Kazan