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学科主题: Physics
题名: The features of nonlinear absorption during resonance one- and two-photon excitation of the basic exciton transition in colloidal CdSe/ZnS quantum dots
作者: Dneprovskii V. S.; Zhukov E. A.; Kozlova M. V.; Smirnov A. M.; Wumaier T.
关键词: nonlinear absorption ; quantum dot ; exciton
刊名: MOSCOW UNIVERSITY PHYSICS BULLETIN
发表日期: 2012
DOI: 10.3103/S0027134912020099
卷: 67, 期:2, 页:201-207
收录类别: SCI
资助者: RFBR
摘要: The 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.
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内容类型: 期刊论文
URI标识: http://ir.xjipc.cas.cn/handle/365002/1636
Appears in Collections:材料物理与化学研究室_期刊论文

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作者单位: Moscow MV Lomonosov State Univ, Dept Phys, Moscow 119991, Russia;Chinese Acad Sci, Xinjiang Tech Inst Phys & Chem, Beijing 100864, Peoples R China

Recommended Citation:
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.
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文件名: the features of nonlinear absorption during resonance one- and two-photon excitation of the basic exciton transition in colloidal cdse zns quantum dots.pdf
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