Tyndall scattering in colloidal solution of quantum dots under the action of laser pulses

被引：0
|
作者：
Smirnov, A. M. [1 ]
Golinskaya, A. D. [2 ]
Ezhova, K. V. [3 ]
Dneprovskii, V. S. [2 ]
机构：
[1] RAS, Kotelnikov IRE, Mokhovaya 11-7, Moscow 125009, Russia
[2] Moscow MV Lomonosov State Univ, 1-2 Leninskie Gory, Moscow 119991, Russia
[3] St Petersburg Univ Informat Technol Mech & Opt, Kronverksky Pr 49, St Petersburg 197101, Russia
来源：
NONLINEAR OPTICS AND ITS APPLICATIONS 2018 | 2018年 / 10684卷
关键词：
quantum dots; Tyndall scattering; colloidal solution; saturation effect; excitons; nonlinear optical processes; ELECTRON RELAXATION; SELF-DIFFRACTION; EXCITATION; RESONANCE; EXCITONS; LIGHT; BEAM;
D O I：
10.1117/12.2306729
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
The high-intensity nanosecond laser pulses scattering in strongly absorbing colloidal solutions of CdSe/ZnS quantum dots has been investigated. Different types of nonlinear Tyndall scattering mechanism was revealed as a function of excitation radiation intensity. At the low laser pulses intensity (up to 15 MW/cm(2)) saturation of the basic exciton transition in strongly absorbing colloidal solution of CdSe/ZnS quantum dots was observed. In this case of average laser pulses intensity (15-200 MW/cm(2)) the dominant scattering mechanism is scattering on dipoles induced by the electric field and scattering on density fluctuations of the dispersed medium around bleached quantum dots. At the higher intensity (200-4000 MW/cm(2)), the predominant scattering mechanism is the scattering on bubbles of gas formed around local heating centers - colloidal quantum dots.
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页数：6
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