期刊
JOURNAL OF OPTICS A-PURE AND APPLIED OPTICS
卷 11, 期 6, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1464-4258/11/6/065206
关键词
two-photon absorption; two-photon assisted excited-state absorption; absorption cross section
类别
资金
- Science Foundation of the Key Laboratory of Opto-electronics Information Technical Science of the Ministry of Education
- Institute of Modern Optics, Nankai University, China
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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