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Implementation of a Reference Interferometer for Nanodetection
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Measurement of Faraday rotation using phase-sensitive low-coherence interferometry.

Muhammad K Al-Qaisi1, Hui Wang, Taner Akkin

  • 1Department of Biomedical Engineering, University of Minnesota, 312 Church Street SE, Minneapolis, Minnesota 55455, USA.

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Summary

This study introduces a novel differential phase sensor for measuring Faraday rotation in reflection. The sensor achieves high sensitivity, enabling precise analysis of small liquid volumes and Verdet constants.

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Area of Science:

  • Optics and Photonics
  • Fiber Optic Sensing
  • Magneto-optics

Background:

  • Faraday rotation is a key magneto-optic effect used to measure magnetic fields.
  • Existing methods for measuring Faraday rotation can be complex or require large sample volumes.
  • Accurate measurement of Verdet constants is crucial for various optical and sensing applications.

Purpose of the Study:

  • To develop and demonstrate a novel differential phase sensor for measuring Faraday rotation in reflection mode.
  • To achieve high sensitivity and accuracy in Faraday rotation measurements with a single-shot technique.
  • To enable the characterization of small liquid volumes and turbid samples.

Main Methods:

  • Utilizing a polarization-maintaining fiber low-coherence interferometer.
  • Measuring the phase difference between two decorrelated, oppositely polarized circular states incident on a sample.
  • Operating in reflection mode with a small field-depth factor.

Main Results:

  • The sensor achieved a sensitivity of 0.31 arcmin for Faraday rotation.
  • Successfully measured Verdet constants of various liquids, including clear and turbid samples.
  • Demonstrated the capability for analyzing small sample volumes.

Conclusions:

  • The developed differential phase sensor offers a sensitive and efficient method for Faraday rotation measurement.
  • This technology is suitable for characterizing magneto-optic properties of small liquid volumes.
  • The sensor's performance at 857 nm opens possibilities for specific material analyses.