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The features of nonlinear absorption during resonance one- and two-photon excitation of the basic exciton transition in colloidal CdSe/ZnS quantum dots
Dneprovskii V. S.; Zhukov E. A.; Kozlova M. V.; Smirnov A. M.; Wumaier T.
2012
Source PublicationMOSCOW UNIVERSITY PHYSICS BULLETIN
ISSN0027-1349
Volume67Issue:2Pages:201-207
AbstractThe features of the nonlinear absorption of CdSe/ZnS quantum dots (colloidal solution) in the case of resonant one- and two-photon excitation of the basic exciton transition by powerful ultra-short laser pulses were determined. In one-photon excitation, with an increasing intensity of impulses, a decrease in absorption (bleaching) is relayed by an increase in absorption, which is associated with the process of the filling of the states (saturation) of a two-level system with the lifetime of the excited state depending on the light intensity. The arising Fresnel or Fraunhofer diffraction of the laser ray that pass through a colloidal solution with a high concentration of quantum dots is associated with the formation of the transparency channel and self-diffraction of laser ray on an induced diaphragm. In two-photon excitation, the features of the nonlinear absorption and luminescence tracks (the dependence of luminescence intensity on distance) were explained by the influence, in addition to the two-photon absorption, of the processes that are responsible for the slower growth of nonlinear absorption and luminescence quenching at high intensities of laser pulses.
KeywordNonlinear Absorption Quantum Dot Exciton
Subject AreaPhysics
DOI10.3103/S0027134912020099
Indexed BySCI
WOS IDWOS:000304457200011
Citation statistics
Cited Times:6[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.xjipc.cas.cn/handle/365002/1636
Collection材料物理与化学研究室
AffiliationMoscow MV Lomonosov State Univ, Dept Phys, Moscow 119991, Russia;Chinese Acad Sci, Xinjiang Tech Inst Phys & Chem, Beijing 100864, Peoples R China
Recommended Citation
GB/T 7714
Dneprovskii V. S.,Zhukov E. A.,Kozlova M. V.,et al. The features of nonlinear absorption during resonance one- and two-photon excitation of the basic exciton transition in colloidal CdSe/ZnS quantum dots[J]. MOSCOW UNIVERSITY PHYSICS BULLETIN,2012,67(2):201-207.
APA Dneprovskii V. S.,Zhukov E. A.,Kozlova M. V.,Smirnov A. M.,&Wumaier T..(2012).The features of nonlinear absorption during resonance one- and two-photon excitation of the basic exciton transition in colloidal CdSe/ZnS quantum dots.MOSCOW UNIVERSITY PHYSICS BULLETIN,67(2),201-207.
MLA Dneprovskii V. S.,et al."The features of nonlinear absorption during resonance one- and two-photon excitation of the basic exciton transition in colloidal CdSe/ZnS quantum dots".MOSCOW UNIVERSITY PHYSICS BULLETIN 67.2(2012):201-207.
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