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Surface Plasmon-Coupled Emission with Gold Films.

Ignacy Gryczynski1, Joanna Malicka, Zygmunt Gryczynski

  • 1Center for Fluorescence Spectroscopy, University of Maryland at Baltimore, Department of Biochemistry and Molecular Biology, 725 West Lombard Street, Baltimore, Maryland 21201.

The Journal of Physical Chemistry. B
|August 24, 2010
PubMed
Summary

Researchers observed efficient surface plasmon coupled emission (SPCE) using sulforhodamine 101 on gold films. This demonstrates SPCE

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Area of Science:

  • Nanophotonics
  • Surface Plasmon Resonance
  • Fluorescence Spectroscopy

Background:

  • Surface plasmon coupled emission (SPCE) enables directional light collection.
  • Metallic gold is generally known as an efficient quencher of fluorescence.

Purpose of the Study:

  • To investigate surface plasmon coupled emission (SPCE) using sulforhodamine 101 (S101) on thin gold films.
  • To assess the efficiency and characteristics of SPCE through gold, a material typically quenching fluorescence.

Main Methods:

  • Fabrication of thin polymer films containing sulforhodamine 101 on 50 nm gold films on glass.
  • Excitation of fluorophores via direct or plasmon resonance evanescent wave.
  • Analysis of emission properties, including directionality, polarization, and lifetime.

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Main Results:

  • Efficient SPCE was observed through thin gold films, contrary to expectations.
  • Approximately 50% of total emission appeared as SPCE, with p-polarization and angle-dependent wavelengths.
  • SPCE occurred over distances larger than gold's quenching range, with minimal impact on S101 fluorescence lifetime.

Conclusions:

  • Gold films can support efficient SPCE, overcoming their inherent fluorescence quenching properties.
  • SPCE in gold systems occurs over longer distances than previously assumed for gold-mediated energy transfer.
  • Fluorophores on gold-coated surfaces are promising for constructing highly efficient detection devices.