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Surface Plasmon Resonance Based Temperature Sensors in Liquid Environment.

Joyce Ibrahim1, Mostafa Al Masri2, Isabelle Verrier3

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This study measures temperature variations using surface plasmon resonance (SPR) on metallic gratings. This contactless method offers high-resolution, non-invasive temperature sensing in liquids.

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Area of Science:

  • Physics
  • Materials Science
  • Nanotechnology

Background:

  • Temperature changes alter the refractive index of liquids.
  • Surface plasmon resonance (SPR) is sensitive to local refractive index variations.
  • Metallic nanostructures enable direct SPR excitation and sensing.

Purpose of the Study:

  • To develop a contactless method for measuring temperature variations.
  • To analyze temperature-induced shifts in the plasmon signature of metallic surfaces.
  • To demonstrate the efficacy of SPR in a liquid environment.

Main Methods:

  • Utilizing a periodically structured metallic surface (grating) immersed in a liquid.
  • Exciting surface plasmon waves directly on the metallic grating.
  • Monitoring shifts in the SPR frequency due to temperature-induced refractive index changes.

Main Results:

  • A strong correlation was observed between temperature variations and SPR frequency shifts.
  • The experimental setup demonstrated high sensitivity to refractive index changes.
  • The sensor operated effectively over a wide temperature range.

Conclusions:

  • Surface plasmon resonance is a viable non-invasive method for high-resolution temperature measurement.
  • Metallic gratings provide a compact and simple platform for SPR-based temperature sensing.
  • This technique is suitable for monitoring temperature in liquid environments.