Journal of Fluorescence

, Volume 17, Issue 1, pp 7–13

Metal-Enhanced Fluorescence from Gold Surfaces: Angular Dependent Emission

Original Paper

DOI: 10.1007/s10895-006-0149-x

Cite this article as:
Aslan, K., Malyn, S.N. & Geddes, C.D. J Fluoresc (2007) 17: 7. doi:10.1007/s10895-006-0149-x


The first observation of Metal-Enhanced Fluorescence (MEF) from large gold colloids is presented. Gold colloids, 40 and 200 nm diameter, were deposited onto glass substrates in a homogeneous fashion. The angular-dependent fluorescence emission of FITC-HSA, adsorbed onto gold colloids, was measured on a rotating stage which was used to evaluate MEF at all spatial angles. The emission intensity of FITC-HSA was found to be up to 2.5-fold brighter than the emission on bare glass substrates at an angle of 270 degrees. This is explained by the Radiating Plasmon Model, whereby the combined system, composed of the fluorophore and the metal colloids, emits with the photophysical characteristics of the fluorophore, after the excitation and the partial radiationless energy transfer between the excited states of the fluorophore and the surface plasmons of the gold colloids. The fluorescence enhancement was found to be higher with 200 nm gold colloids as compared to 40 nm colloids due to the increased contribution of the scattering portion of the 200 nm gold colloid extinction spectrum. These observations suggest that gold colloids could be used in MEF applications, offering more stable surfaces than the commonly used silvered surfaces, for applications requiring longer term storage and use.


Metal-enhanced fluorescenceGold colloidsFluoresceinSilver colloidsLight scatteringAngular-dependent emissionRadiating plasmon modelSurface-enhanced fluorescenceRadiative decay engineeringPlasmonsPlasmonics



Human serum albumin


Metal-Enhanced Fluorescence


Radiating Plasmon Model

Copyright information

© Springer Science+Business Media, LLC 2006

Authors and Affiliations

  • Kadir Aslan
    • 1
  • Stuart N. Malyn
    • 1
  • Chris D. Geddes
    • 1
    • 2
  1. 1.Institute of Fluorescence, Laboratory for Advanced Medical Plasmonics, Medical Biotechnology CenterUniversity of Maryland Biotechnology InstituteBaltimoreUSA
  2. 2.Center for Fluorescence Spectroscopy, Department of Biochemistry and Molecular Biology, Medical Biotechnology CenterUniversity of Maryland School of MedicineBaltimoreUSA