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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 20 — Oct. 1, 2007
  • pp: 12806–12817

Near-field coupling of a single fluorescent molecule and a spherical gold nanoparticle

T. Härtling, P. Reichenbach, and L. M. Eng  »View Author Affiliations

Optics Express, Vol. 15, Issue 20, pp. 12806-12817 (2007)

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Near-field coupling of a single gold nanoparticle (GNP) to a single fluorescent molecule is investigated here for varying separation d between the two. While the emission quantum efficiency of the coupled system generally decreases for d → 0, a pronounced near-field enhancement is observed under certain conditions, partly outweighing the efficiency loss at small distances. We report on optimizing these conditions by varying the excitation field direction and the three-dimensional relative configuration between the GNP and the fluorophore. Furthermore, we examine how the sphere diameter, the surrounding medium, as well as the absorption and emission wavelengths of the molecular dipole influence the fluorescence yield. Our results are of high practical relevance for all GNP-mediated application fields such as fluorescence microscopy, scattering near-field optical microscopy, bioanalytics, and medical applications.

© 2007 Optical Society of America

OCIS Codes
(180.2520) Microscopy : Fluorescence microscopy
(240.6680) Optics at surfaces : Surface plasmons
(260.2510) Physical optics : Fluorescence

ToC Category:

Original Manuscript: June 6, 2007
Revised Manuscript: July 16, 2007
Manuscript Accepted: July 19, 2007
Published: September 21, 2007

Virtual Issues
Vol. 2, Iss. 11 Virtual Journal for Biomedical Optics

T. Härtling, P. Reichenbach, and L. M. Eng, "Near-field coupling of a single fluorescent molecule and a spherical gold nanoparticle," Opt. Express 15, 12806-12817 (2007)

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