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Author van Oijen, A. M. ♦ Verberk, R. ♦ Durand, Y. ♦ Schmidt, J. ♦ van Lingen, J. N. J. ♦ Bol, A. A. ♦ Meijerink, A.
Sponsorship (US)
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Publisher The American Physical Society
Language English
Subject Keyword PHYSICS OF ELEMENTARY PARTICLES AND FIELDS ♦ ABSORPTION ♦ EXCITATION ♦ FLUORESCENCE ♦ LASERS ♦ MICROSCOPY ♦ PHOTONS ♦ PHYSICS ♦ POLYMERS ♦ SPECTROSCOPY
Abstract By use of low-temperature confocal microscopy, continuous-wave two-photon fluorescence images are obtained of individual CdS nanocrystallites embedded in a polymer matrix. The quadratic dependence of the emission rate on the applied laser power proves that the observed fluorescence originates from the simultaneous absorption of two photons. From the experimental data the two-photon absorption cross-section {sigma}{sup (2)} could be determined, resulting in a value smaller than that known from literature. The work presented is a first step towards high-resolution fluorescence-excitation spectroscopy on the electronic states in the band edge, inaccessible by conventional one-photon spectroscopy. {copyright} 2001 American Institute of Physics.
ISSN 00036951
Educational Use Research
Learning Resource Type Article
Publisher Date 2001-08-06
Publisher Place United States
Journal Applied Physics Letters
Volume Number 79
Issue Number 6


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