TITLE

Optical near-field enhancement at a metal tip probed by a single fluorophore

AUTHOR(S)
Kramer, A.; Trabesinger, W.; Hecht, B.; Wild, U. P.
PUB. DATE
March 2002
SOURCE
Applied Physics Letters;3/4/2002, Vol. 80 Issue 9, p1652
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The optical near-field in the vicinity of a metal tip is mapped using a single-molecule optical probe. We observe an enhancement of the fluorescence signal by a factor of 5.7 ± 0.3, clearly larger than the fourfold enhancement that can arise from constructive interference if the tip acts as a simple mirror. Considering the tip apex as a nanoparticle of nonregular shape, we suggest that, in the case of gold tips, the enhancement is due to resonant plasmon excitation. Consistently, no enhancement has been observed using Pt/Ir tips.
ACCESSION #
6220541

 

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