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Proceedings Paper

Fluorescence detection of single molecules using pulsed near-field optical excitation and time-correlated photon counting
Author(s): W. Patrick Ambrose; Peter M. Goodwin; John C. Martin; Richard A. Keller
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Paper Abstract

Pulsed excitation, time correlated single photon counting, and time gated detection are used in near-field optical microscopy to enhance fluorescence images and measure the fluorescence lifetimes of single molecules of Rhodamine 6G on silica surfaces. Time gated detection is used to reject prompt scattered background and to improve the image signal to noise ratio. The excited state lifetime of a single Rhodamine 6G molecule is found to depend on the position of the near-field probe. We attribute the lifetime variations to spontaneous emission rate alterations by the fluorescence reflected from and quenching by the aluminum coated probe.

Paper Details

Date Published: 21 July 1994
PDF: 10 pages
Proc. SPIE 2125, Laser Techniques for Surface Science, (21 July 1994); doi: 10.1117/12.180866
Show Author Affiliations
W. Patrick Ambrose, Los Alamos National Lab. (United States)
Peter M. Goodwin, Los Alamos National Lab. (United States)
John C. Martin, Los Alamos National Lab. (United States)
Richard A. Keller, Los Alamos National Lab. (United States)

Published in SPIE Proceedings Vol. 2125:
Laser Techniques for Surface Science
Hai-Lung Dai; Steven J. Sibener, Editor(s)

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