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Updated: Jun 20, 2026

Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons
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Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons

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Bulk sensing experiments using a surface-plasmon interferometer.

Peter Debackere1, Roel Baets, Peter Bienstman

  • 1Photonics Research Group, Department of Information Technology-Ghent University-IMEC, Sint-Pietersnieuwstraat 41, 9000 Gent, Belgium. Peter.Debackere@intec.UGent.be

Optics Letters
|September 17, 2009
PubMed
Summary
This summary is machine-generated.

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A novel surface-plasmon interferometer demonstrates effective biosensing capabilities. This device accurately measures bulk refractive index changes, showing high spectral interrogation sensitivity for biosensing applications.

Area of Science:

  • Optoelectronics
  • Biomedical Engineering
  • Analytical Chemistry

Background:

  • Surface plasmon resonance (SPR) is a label-free optical technique widely used for detecting biomolecular interactions.
  • Interferometry offers high sensitivity in optical measurements and can be combined with SPR for enhanced biosensing.

Purpose of the Study:

  • To present experimental evidence for a surface-plasmon interferometer (SPI) as a viable biosensor.
  • To evaluate the device's capability for bulk refractive index sensing.
  • To quantify the spectral interrogation sensitivity of the SPI biosensor.

Main Methods:

  • Fabrication and characterization of a surface-plasmon interferometer.
  • Utilizing the SPI device for bulk refractive index measurements.

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Last Updated: Jun 20, 2026

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  • Spectral analysis to determine sensor sensitivity.

    • Main Results:

    • The surface-plasmon interferometer successfully functioned as a biosensor.
    • The device demonstrated capability for bulk refractive index sensing (bulk refractometry).
    • A high spectral interrogation sensitivity of 315.145 nm/refractive index unit was achieved.

    Conclusions:

    • The surface-plasmon interferometer is a promising platform for biosensing.
    • The device exhibits excellent sensitivity for detecting changes in refractive index.
    • This technology holds potential for various label-free biosensing applications.