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Directional surface plasmon-coupled emission: A new method for high sensitivity detection.

Joseph R Lakowicz1, Joanna Malicka, Ignacy Gryczynski

  • 1University of Maryland at Baltimore, Department of Biochemistry and Molecular Biology, 725 West Lombard Street, Baltimore, MD 21201, USA. cfs@cfs.umbi.umd.edu

Biochemical and Biophysical Research Communications
|August 2, 2003
PubMed
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Researchers developed a new method to enhance fluorescence collection efficiency. By using a silver film, isotropic emission is converted to directional emission, boosting detection rates significantly.

Area of Science:

  • Optics and Photonics
  • Materials Science
  • Biotechnology

Background:

  • Fluorescence emission is typically isotropic, leading to low collection efficiency (<1%) with standard optical setups.
  • Existing methods for enhancing fluorescence detection are often complex or inefficient.

Purpose of the Study:

  • To present a novel approach for transforming isotropic fluorescence emission into directional emission.
  • To achieve significantly higher collection efficiency for fluorophore detection.

Main Methods:

  • Utilizing fluorophores positioned near a semi-transparent silver film on a glass substrate.
  • Coupling fluorescence emission with surface plasmon resonance (SPR) on the silver surface.
  • Directing coupled emission into the transparent substrate at a specific angle determined by SPR.

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Main Results:

  • Achieved near 50% collection efficiency by converting isotropic to directional emission.
  • Estimated 40-70% of total emission coupled to the surface plasmon and directed towards the substrate.
  • Demonstrated background emission suppression from distant fluorophores.
  • Showcased spectral discrimination without additional optics due to wavelength-dependent coupling angles.

Conclusions:

  • Surface plasmon-coupled emission (SPCE) offers a novel technology for high-efficiency fluorescence detection.
  • This method is suitable for microfluidic and surface-bound assay formats.
  • SPCE enables sensitive detection with simplified optical configurations.