The features of nonlinear absorption during resonance one- and two-photon excitation of the basic exciton transition in colloidal CdSe/ZnS quantum dots

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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.
刊名	MOSCOW UNIVERSITY PHYSICS BULLETIN
	2012
卷号	67 期号:2 页码:201-207
关键词	nonlinear absorption quantum dot exciton
ISSN号	0027-1349
英文摘要	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.
学科主题	Physics
收录类别	SCI
WOS记录号	WOS:000304457200011
公开日期	2012-11-29
内容类型	期刊论文
源URL	[http://ir.xjipc.cas.cn/handle/365002/1636]
专题	新疆理化技术研究所_材料物理与化学研究室
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
推荐引用方式 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.