Plasmonic Enhancement of Molecular Fluorescence

Felicia Tam,† Glenn P. Goodrich,§ Bruce R. Johnson, and Naomi J. Halas*‡
Department of Physics and Astronomy, Department of Chemistry, Department of Electrical and Computer Engineering, and The Laboratory for Nanophotonics, Rice University, 6100 Main Street, Houston, Texas 77005, and Nanospectra Biosciences, Inc., 8285 El Rio Street, Suite 150, Houston, Texas 77054
Nano Lett., 2007, 7 (2), pp 496–501
DOI: 10.1021/nl062901x
Publication Date (Web): January 27, 2007
Copyright © 2007 American Chemical Society
†

 Department of Physics and Astronomy, Rice University.

,

 The Laboratory for Nanophotonics, Rice University.

,
§

 Nanospectra Biosciences, Inc.

,

 Department of Chemistry, Rice University.

,
*

 Corresponding author. E-mail:  halas@rice.edu.

,
‡

 Department of Electrical and Computer Engineering, Rice University.

Abstract

Abstract Image

Metallic nanoparticles are known to dramatically modify the spontaneous emission of nearby fluorescent molecules and materials. Here we examine the role of the nanoparticle plasmon resonance energy and nanoparticle scattering cross section on the fluorescence enhancement of adjacent indocyanine green (ICG) dye molecules. We find that enhancement of the molecular fluorescence by more than a factor of 50 can be achieved for ICG next to a nanoparticle with a large scattering cross section and a plasmon resonance frequency corresponding to the emission frequency of the molecule.

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History

  • Published In Issue February 14, 2007
  • Received December 11, 2006
    Revised Manuscript Received January 13, 2007

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