Specific features of resonant nonlinear absorption in colloidal solutions of CdSe/ZnS quantum dots
В. В. ДаниловSt. Petersburg State Transport University, St. Petersburg, 191031, RussiaА. С. ПанфутоваVavilov State Optical Institute, St. Petersburg, 199034, RussiaА. И. ХребтовNanotechnology Research and Education Centre Russian Academy of Sciences, St. Petersburg Academic University, St. Petersburg, 194021, RussiaТ. С. ТитоваSt. Petersburg State Transport University, St. Petersburg, 191031, Russia
2015en
ABI
Abstract
Nonlinear refraction coefficients and nonlinear absorption coefficients of colloidal solutions of CdSe/ZnS quantum dots (QDs) have been measured by the z-scan method. Resonant excitation was carried out by a Nd:YAG laser (λ = 532 nm, τ ∼ 7 ns). QDs have been chosen to correspond to different positions of the peak of the fundamental exciton absorption band with respect to the laser wavelength. The z-scan data are compared with the optical-limitation photodynamics data on CdSe/ZnS QD solutions. The obtained values of nonlinear absorption coefficients and their dependence on the QD size are interpreted in terms of the two-step mechanism of optical limitation.
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