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Title
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Five orders-of-magnitude enhancement of two-photon absorption for dyes on silver nanoparticle fractal clusters
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Author
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Abstract
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| Strong enhancement of the two-photon absorption of organic molecules near silver nanoparticle fractal clusters has been observed and has been exploited to yield composite materials with very strong two-photon absorption and two-photon-excited fluorescence properties. Measurements on cluster films coated with chromophoric polymer or with thiol-bound chromophores give spatially-averaged enhancements of 1000 and 20 000, respectively. Two-photon fluorescence microscopy studies show that the enhancements are spatially inhomogeneous, with peak-enhancement factors of ≥ 10 000 (polymer/cluster) and ≥ 160 000 (thiol chromophore/cluster), and excitation frequency dependent. These results are in accord with theoretical predictions of local-field effects due to strong localization of collective plasmon modes in fractal metal clusters, and demonstrate an approach to ultrasensitive two-photon processes. |
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Language
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English
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Source (journal)
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The journal of physical chemistry : B : materials, surfaces, interfaces and biophysical. - Washington, D.C., 1997, currens
The journal of physical chemistry : B : condensed matter, materials, surfaces, interfaces and biophysical. - Washington, D.C.
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Publication
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Washington, D.C.
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2002
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ISSN
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1089-5647
[print]
1520-5207
[online]
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DOI
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10.1021/JP014675F
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Volume/pages
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106
:27
(2002)
, p. 6853-6863
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ISI
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000176600800006
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Full text (Publisher's DOI)
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