Applied Physics B

, Volume 73, Issue 4, pp 373–377 | Cite as

Electromagnetic interaction of fluorophores with designed two-dimensional silver nanoparticle arrays

  • H. Ditlbacher
  • N. Felidj
  • J.R. Krenn
  • B. Lamprecht
  • A. Leitner
  • F.R. Aussenegg

Abstract.

We study the fluorescence enhancement of dye molecules adsorbed on regular two-dimensional arrays of designed silver nanoparticles. The silver particles show two orthogonal optical resonances at different wavelengths because of their elongated shape. The short-wavelength resonance was designed to fit to the absorption maximum of the fluorophore. When the excitation light drives the short-wavelength resonance, the measured fluorescence intensity is strongly enhanced compared to that for the orthogonal particle orientation. This shows directly a strong electromagnetic coupling between the nanoparticles and the fluorophore. Additionally enhanced photochemical bleaching is observed due to the interaction of fluorophores with the particles. Using a rate model describing the fluorescence enhancement and the bleaching enhancement, an average value for the particle-induced increase in the radiative fluorescence rate is obtained, together with a lower limit for the averaged particle-induced field intensity enhancement factor.

PACS: 78.67.B; 33.50.D 

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Copyright information

© Springer-Verlag 2001

Authors and Affiliations

  • H. Ditlbacher
    • 1
  • N. Felidj
    • 2
  • J.R. Krenn
    • 1
  • B. Lamprecht
    • 1
  • A. Leitner
    • 1
  • F.R. Aussenegg
    • 1
  1. 1.Institute for Experimental Physics, Karl-Franzens-University Graz, and Erwin-Schrödinger Institute for Nanoscale Research, Graz, AustriaAT
  2. 2.Interfaces, Traitements, Organisation et Dynamique des Systemes, Université Paris 7, CNRS UPRES.A, Paris, FranceFR

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