Two-photon absorption and two-photon assisted excited-state absorption in CdSe0.3S0.7 quantum dots

被引：10
|
作者：
Wu, Feng [1 ,2 ]
Zhang, Guilan [1 ]
Tian, Wei [1 ]
Chen, Wenju [1 ]
Zhao, Guofeng [3 ]
Cao, Shidong [3 ]
Xie, Wei [3 ]
机构：
[1] Nankai Univ, Inst Modern Opt, Tianjin 300071, Peoples R China
[2] N Univ China, Dept Phys, Taiyuan 030051, Peoples R China
[3] Yourui Quantum Dots Co Technol Dev, Tianjin 300071, Peoples R China
来源：
JOURNAL OF OPTICS A-PURE AND APPLIED OPTICS | 2009年 / 11卷 / 06期
关键词：
two-photon absorption; two-photon assisted excited-state absorption; absorption cross section; OPTICAL-DATA STORAGE; SPECTRA; LASER;
D O I：
10.1088/1464-4258/11/6/065206
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
CdSe0.3S0.7 quantum dots (QDs) with a diameter of about 4 nm were synthesized by a chemical route. The two-photon absorption (TPA) and two-photon assisted excited-state absorption (TPESA) of these QDs were investigated at the wavelength of 532 nm using a picosecond laser in an open-aperture Z scan setup. The TPA cross section for these nanoparticles is about 3.7 x 10(6) GM, which is several orders of magnitude larger than that for a conventional fluorescence probe. The TPESA cross section is on the order of magnitude of 10(-19) cm(2). These optical properties of the QDs may allow them to be applied in optoelectronic and biological fields.
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页数：5
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