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Multimode reverse-symmetry waveguide sensor for broad-range refractometry.

Nina Skivesen1, Robert Horvath, Henrik C Pedersen

  • 1Optics and Fluid Dynamics Department, Risø National Laboratory, DK-4000 Roskilde, Denmark. nina.skivesen@risoe.dk

Optics Letters
|December 24, 2003
PubMed
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A new optical waveguide sensor detects liquid and gas refractive indices using a simple glass plate. Its unique design allows for a wide detection range, offering an alternative to existing methods.

Area of Science:

  • Optoelectronics
  • Chemical Sensing
  • Materials Science

Background:

  • Refractive index sensing is crucial for chemical analysis.
  • Monomode waveguides are common but can be complex.
  • A need exists for simpler, wider-range refractive index sensors.

Purpose of the Study:

  • To present a novel sensor design for absolute refractive index detection.
  • To utilize a grating-coupled multimode planar optical waveguide.
  • To offer a simple and effective alternative to existing waveguide sensors.

Main Methods:

  • A 50-microm-thick, free-standing glass plate was employed as the waveguide.
  • The waveguide had air beneath and the sample on top.
  • A grating coupler facilitated light interaction for detection.

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Main Results:

  • The sensor successfully performed absolute detection of refractive indices.
  • The multimode waveguide design demonstrated a large detection range.
  • The reverse-symmetry configuration contributed to the sensor's performance.

Conclusions:

  • The proposed sensor design is a viable and simple alternative for refractive index measurements.
  • The multimode planar optical waveguide offers advantages in detection range.
  • This technology has potential applications in liquid and gas analysis.