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This study introduces a novel optical Vernier effect method using a few-mode interferometer. This technique overcomes spectral limitations, enabling significantly enhanced sensitivity and resolution for sensing applications.

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Area of Science:

  • Optics and Photonics
  • Interferometry
  • Fiber Sensing

Background:

  • The optical Vernier effect enhances sensitivity by overlapping interferometer responses.
  • Conventional methods face limitations due to immeasurable beating modulation within usable spectral ranges.

Purpose of the Study:

  • To propose a novel method to overcome spectral limitations in optical Vernier effect measurements.
  • To develop a highly sensitive fiber refractometer using this enhanced effect.

Main Methods:

  • Utilized a few-mode sensing interferometer instead of a single-mode one.
  • Leveraged the overlap response of different modes to create a measurable envelope.
  • Implemented the method in a fiber optic refractometer.

Main Results:

  • Achieved a measurable envelope while preserving a high magnification factor.
  • Demonstrated an order of magnitude higher magnification than state-of-the-art.
  • Developed a fiber refractometer with ~500 µm/RIU sensitivity and >850 magnification factor.

Conclusions:

  • The few-mode interferometer approach effectively surpasses spectral limitations of the optical Vernier effect.
  • This method offers a significant advancement in high-sensitivity sensing, particularly for refractometry.