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High-visibility optofluidic Mach-Zehnder interferometer.

Genni Testa1, Yujian Huang, Pasqualina M Sarro

  • 11IREA-CNR, Via Diocleziano 328, 80124 Napoli, Italy.

Optics Letters
|May 19, 2010
PubMed
Summary

This study presents a compact optofluidic Mach-Zehnder interferometer using liquid-core waveguides. The optimized device achieves high visibility, enabling sensitive optical sensing applications.

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Area of Science:

  • Optofluidics
  • Integrated Optics
  • Interferometry

Background:

  • Mach-Zehnder interferometers are crucial for sensing.
  • Integrating fluidics with optics offers new sensing modalities.
  • Achieving high visibility in compact devices is challenging.

Purpose of the Study:

  • To develop a high-visibility integrated optofluidic Mach-Zehnder interferometer.
  • To optimize device geometry for minimal intensity imbalance.
  • To demonstrate a compact and low-volume optofluidic sensing platform.

Main Methods:

  • Design and fabrication of a liquid-core antiresonant reflecting optical waveguide interferometer.
  • Geometric optimization to minimize intensity imbalance between interferometer arms.
  • Optical characterization of device performance, including visibility and fringe analysis.

Main Results:

  • A highly compact (2.5 mm length) optofluidic Mach-Zehnder interferometer was realized.
  • Minimized intensity imbalance achieved for highly unbalanced configurations.
  • High visibility demonstrated, with experimental fringes matching theoretical predictions.
  • Low liquid volume requirement of approximately 0.16 nl.

Conclusions:

  • The developed optofluidic interferometer offers a compact and efficient platform for optical sensing.
  • The design enables high-visibility measurements crucial for sensitive detection.
  • This technology holds promise for advanced microfluidic and photonic applications.