Continuous-wave two-photon excitation of individual CdS nanocrystallites

Journal Article · Mon Aug 06 00:00:00 EDT 2001 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.1391231· OSTI ID:40230719

van Oijen, A M; Verberk, R; Durand, Y; Schmidt, J; Bol, A A; Meijerink, A

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.

• Sponsoring Organization: (US)
• OSTI ID: 40230719
• Journal Information: Applied Physics Letters, Vol. 79, Issue 6; Other Information: DOI: 10.1063/1.1391231; Othernumber: APPLAB000079000006000830000001; 022132APL; PBD: 6 Aug 2001; ISSN 0003-6951
• Publisher: The American Physical Society
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ABSORPTION
EXCITATION
FLUORESCENCE
LASERS
MICROSCOPY
PHOTONS
PHYSICS
POLYMERS
SPECTROSCOPY