e-Journal of Surface Science and Nanotechnology
Online ISSN : 1348-0391
ISSN-L : 1348-0391
Conference -ISSS-5-
Long Range Enhancement of Molecular Fluorescence by Closely Packed Submicro-scale Ag Islands
Tomohiro FukuuraMitsuo Kawasaki
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2009 Volume 7 Pages 653-659

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Abstract

We found that closely packed submicro-scale Ag islands (each ∼370 nm across and ∼90 nm in height on the average) produced not only extremely short-range fluorescence enhancement for rhodamine dye (RhB) placed only ∼1 nm away from the metal surface, but also a novel, long-range enhancement for the same dye for the metal—molecule distance up to ∼50 nm. The net enhancement factor for the spin-coated RhB, with a fluorescence quantum yield of ∼2 % in the absence of Ag islands, was as high as ∼20-folds at the metal--molecule distance of ∼30 nm. We propose that strong interparticle surface plasmon interactions involving such large Ag islands play crucial roles for the long-range fluorescence enhancement. [DOI: 10.1380/ejssnt.2009.653]

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