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Related Concept Videos

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Related Experiment Video

Updated: Apr 28, 2026

Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons
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Detection limits of confocal surface plasmon microscopy.

Suejit Pechprasarn1, Michael G Somekh1

  • 1Institute of Biophysics Imaging and Optical Science (IBIOS), Life Sciences Building University of Nottingham, UK, NG7 2RD, UK.

Biomedical Optics Express
|June 19, 2014
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Summary

This study shows that confocal optical microscopy can detect small numbers of molecules by exciting surface plasmons. Reliable single-molecule detection may require structured surfaces for enhanced sensitivity.

Keywords:
(060.4080) Modulation(110.0110) Imaging systems(120.0120) Instrumentation, measurement, and metrology(180.0180) Microscopy

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Area of Science:

  • Optics and Photonics
  • Surface Science
  • Nanotechnology

Background:

  • Confocal optical microscopy is a powerful tool for high-resolution imaging.
  • Surface plasmons offer unique light-matter interaction properties at the nanoscale.
  • Detecting small numbers of molecules is crucial for various scientific applications.

Purpose of the Study:

  • To evaluate the minimum mass sensitivity of a confocal optical microscope for surface plasmon excitation and detection.
  • To compare theoretical diffraction models with intuitive ray optics for predicting microscope performance.
  • To explore strategies for achieving reliable single-molecule detection using this technique.

Main Methods:

  • Application of rigorous diffraction theory to model microscope performance.
  • Comparison of theoretical predictions with an intuitive ray optics model.
  • Analysis of surface plasmon excitation and detection on planar metallic substrates.

Main Results:

  • The diffraction model and ray picture provide similar predictions for microscope sensitivity.
  • Detection of small molecule quantities is achievable under favorable conditions.
  • Reliable single-molecule detection may necessitate the use of structured surfaces.

Conclusions:

  • Confocal optical microscopy with surface plasmon excitation shows promise for sensitive molecular detection.
  • Optimizing system configurations is key to maximizing performance.
  • Structured surfaces are proposed as a means to improve single-molecule detection reliability.