Five orders-of-magnitude enhancement of two-photon absorption for dyes on silver nanoparticle fractal clusters

被引：197

作者：

Wenseleers, W ^{[1
]}

Stellacci, F ^{[1
]}

Meyer-Friedrichsen, T ^{[1
]}

Mangel, T ^{[1
]}

Bauer, CA ^{[1
]}

Pond, SJK ^{[1
]}

Marder, SR ^{[1
]}

Perry, JW ^{[1
]}

机构：

[1] Univ Arizona, Dept Chem, Tucson, AZ 85721 USA

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 2002年 / 106卷 / 27期

关键词：

D O I：

10.1021/jp014675f

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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 greater than or equal to 10 000 (polymer/cluster) and greater than or equal to 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.

引用

页码：6853 / 6863

页数：11

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