Volume 51, Number 4, August II 2000
|Page(s)||374 - 380|
|Published online||01 September 2002|
Quenching and enhancement of single-molecule fluorescence under metallic and dielectric tips
Laboratoire Aimé Cotton - Bâtiment 505, 91405 Orsay Cedex, France
Corresponding author: email@example.com
Accepted: 14 June 2000
We report on fluorescence experiments by apertureless near-field optical microscopy. We develop a simple model that demonstrates the importance of non-radiative transfer and that takes into account the dependence of non-radiative transfer on tip geometry. This process is in competition with field enhancement and it is a key process to understand the observed fluorescence enhancement factors. The analysis of the different factors involved in the global fluorescence enhancement or quenching leads to new strategies to reach resolution down to a few nanometers by apertureless fluorescence microscopy.
PACS: 07.79.Fc – Near-field scanning optical microscopes / 33.50.-j – Fluorescence and phosphorescence; radiationless transitions, quenching (intersystem crossing, internal conversion) / 33.50.Hv – Radiationless transitions, quenching
© EDP Sciences, 2000
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