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Plasmonics

, Volume 7, Issue 4, pp 739–744 | Cite as

Distance Dependence of Metal-Enhanced Fluorescence

  • Anatoliy I. Dragan
  • Eric S. Bishop
  • Jose R. Casas-Finet
  • Robert J. Strouse
  • James McGivney
  • Mark A. Schenerman
  • Chris D. Geddes
Article

Abstract

In recent years both the mechanism and applications of metal-enhanced fluorescence (MEF) have attracted significant attention, yet many fundamental aspects of MEF remain unanswered or addressed. In this study, we address a fundamental aspect of MEF. Using fluorescein-labeled different length DNA scaffolds, covalently bound to silver nanodeposits, we have experimentally measured the distance dependence of the MEF effect. The enhanced fluorescence signatures, i.e., MEF, follow quite closely the theoretical decay of the near-field of the nanoparticles, calculated using finite difference time domain approaches. This implies that the mechanisms of MEF are partially underpinned by the magnitude and distribution of the electric field around near-field nanoparticles.

Keywords

Metal-Enhanced fluorescence Surface plasmons Near-field strength Nanoparticles DNA scaffolds Surface-enhanced fluorescence Radiative-decay engineering Plasmon-enhanced fluorescence 

Notes

Acknowledgments

The authors thank MedImmune Inc., for financial support as well as the University of Maryland Baltimore County for salary contributions.

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Copyright information

© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  • Anatoliy I. Dragan
    • 1
  • Eric S. Bishop
    • 2
  • Jose R. Casas-Finet
    • 2
  • Robert J. Strouse
    • 2
  • James McGivney
    • 2
  • Mark A. Schenerman
    • 2
  • Chris D. Geddes
    • 1
  1. 1.Institute of Fluorescence and Department of Chemistry and Biochemistry, The Columbus CenterUniversity of Maryland Baltimore CountyBaltimoreUSA
  2. 2.MedImmune LLCGaithersburgUSA

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