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High-sensitivity, evanescent field refractometric sensor based on a tapered, multimode fiber interference.

Pengfei Wang1, Gilberto Brambilla, Ming Ding

  • 1Optoelectronics Research Centre, University of Southampton, Southampton SO17 1BJ, UK. pw3y09@orc.soton.ac.uk

Optics Letters
|June 21, 2011
PubMed
Summary
This summary is machine-generated.

We developed a highly sensitive fiber optic sensor for measuring refractive index (RI) using a tapered multimode fiber. This novel sensor achieves unprecedented sensitivity, surpassing existing technologies for RI detection.

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Area of Science:

  • Optics and Photonics
  • Fiber Optic Sensing
  • Materials Science

Background:

  • Refractive index (RI) sensing is crucial in various scientific and industrial applications.
  • Existing fiber optic refractometers face limitations in sensitivity and measurement range.

Purpose of the Study:

  • To propose and demonstrate an enhanced evanescent field fiber refractometer.
  • To achieve ultrahigh sensitivity for refractive index measurements.

Main Methods:

  • Fabrication of a fiber sensor by sandwiching a tapered multimode fiber between two single-mode fibers.
  • Experimental characterization of the sensor's performance for RI measurements.

Main Results:

  • The fiber sensor demonstrated ultrahigh sensitivity exceeding 1900 nm/RIU at a refractive index of 1.44.
  • The sensor operated effectively within the refractive index range of 1.33-1.44.
  • Experimental results aligned with theoretical predictions.

Conclusions:

  • The proposed evanescent field fiber refractometer offers record-breaking sensitivity for RI sensing.
  • This technology holds significant potential for advanced applications requiring precise RI detection.