Multi-photon excitation properties of CdSe quantum dots solutions and optical limiting behavior in infrared range

被引：156

作者：

He, Guang S. ^{[1
]}

Yong, Ken-Tye ^{[1
]}

Zheng, Qingdong ^{[1
]}

Sahoo, Yudhisthira ^{[1
]}

Baev, Alexander ^{[1
]}

Ryasnyanskiy, Aleksandr I. ^{[1
]}

Prasad, Paras N. ^{[1
]}

机构：

[1] SUNY Buffalo, Inst Lasers Photon & Biophoton, Buffalo, NY 14260 USA

来源：

OPTICS EXPRESS | 2007年 / 15卷 / 20期

关键词：

D O I：

10.1364/OE.15.012818

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Multi-photon absorption and excitation properties of CdSe quantum dots in hexane with different dot-sizes have been investigated. The two- and three-photon absorption (2PA and 3PA) coefficients were measured by using similar to 160-fs laser pulses at wavelengths of similar to 775-nm and similar to 1300-nm, respectively. The dependence of one-, two- and three-photon induced fluorescence spectra as well as their double-exponential decay on the dot-sizes was studied. Based on the fluorescence emission spectra and temporal decay constants for a given sample solution excited by one-, two- and three- photon absorption, it can be concluded that the transition pathways for fluorescence emission and decay under one-, two- and three-photon excitation are nearly identical. The optical power limiting capabilities based on 2PA and 3PA mechanisms are demonstrated separately. In addition, a saturation behavior of 3PA at similar to 1300-nm was observed. (c) 2007 Optical Society of America.

引用

页码：12818 / 12833

页数：16

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