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Multimode Fabry⁻Perot Interferometer Probe Based on Vernier Effect for Enhanced Temperature Sensing.

André D Gomes1,2, Martin Becker3, Jan Dellith4

  • 1Leibniz Institute of Photonic Technology (IPHT), Albert-Einstein-Strasse 9, 07745 Jena, Germany. andre.gomes@leibniz-ipht.de.

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Summary
This summary is machine-generated.

New optical fiber sensors utilize the Vernier effect to achieve over 60x higher temperature sensitivity. This breakthrough enables highly resolved temperature measurements for advanced biological and medical applications.

Keywords:
Fabry–Perot interferometerVernier effectfocused ion beamoptical fiber sensortemperature sensing

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Area of Science:

  • Optical physics
  • Sensor technology
  • Materials science

Background:

  • Miniaturized sensors for biological and medical applications require high resolution to detect subtle environmental changes.
  • The Vernier effect offers a method to significantly enhance sensor sensitivity and resolution.

Purpose of the Study:

  • To develop a miniaturized optical fiber Fabry-Perot interferometer (FPI) probe leveraging the Vernier effect for enhanced temperature sensing.
  • To achieve a higher temperature resolution compared to conventional FPI sensors.

Main Methods:

  • Fabrication of a silica FPI using focused ion beam milling on a tapered multimode fiber.
  • Exploitation of multiple FPIs generated within the fiber cavity due to modal interference.
  • Analysis of the reflection spectrum's Fast Fourier Transform (FFT) to identify components responsible for the Vernier effect.

Main Results:

  • Demonstrated over 60-fold increase in temperature sensitivity compared to standard FPIs.
  • Achieved a temperature sensitivity of -654 pm/°C within the 30 °C to 120 °C range.
  • Attained an experimental temperature resolution of 0.14 °C.

Conclusions:

  • The Vernier effect effectively enhances the sensitivity of optical fiber FPI probes for temperature sensing.
  • The developed sensor demonstrates high resolution suitable for demanding biological and medical applications.
  • The sensor exhibits stability, making it a promising candidate for practical implementation.