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Related Experiment Videos

Plasmon resonance microsensor for droplet analysis.

M Chaigneau1, K Balaa, T Minea

  • 1Institut des Matériaux Jean Rouxel, UMR 6502, CNRS-Université de Nantes, BP 2229, 44322 Nantes, France. marc.chaigneau@cnrs-imn.fr

Optics Letters
|August 19, 2007
PubMed
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Microscale fiber tip sensors utilize plasmon resonance for sensitive detection in tiny liquid volumes. These plasmonic sensors show promise for biosensing applications in aqueous environments.

Area of Science:

  • Nanotechnology
  • Plasmonics
  • Optical Sensing

Background:

  • Plasmon resonance enables highly sensitive optical detection.
  • Microscale sensors are needed for analyzing small sample volumes.

Purpose of the Study:

  • To develop and optimize microscale fiber tip sensors for sensing applications.
  • To investigate the sensing capabilities of plasmonic fiber tip sensors.

Main Methods:

  • Fabrication of tapered fiber tip sensors coated with nanoporous silver film.
  • Optimization of sensor fabrication derived from near-field scanning optical microscopy probe manufacturing.
  • Characterization of sensor sensitivity to refractive index changes.

Main Results:

Related Experiment Videos

  • Sensors are effective in detecting refractive indices between 1.33 and 1.40.
  • Sensitivity achieved is at least 3 x 10(-4) refractive index unit (RIU)/nm.
  • Demonstrated Raman scattering enhancement due to localized plasmon resonance.

    • Conclusions:

    • Microscale fiber tip sensors offer high sensitivity for refractive index detection.
    • The sensors are suitable for biosensing in small aqueous volumes, including biomedical applications.
    • Localized plasmon resonance plays a key role in the sensor's performance.