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Updated: Jun 22, 2026

Implementation of a Reference Interferometer for Nanodetection
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Compact tunable microfluidic interferometer.

Christian Grillet, P Domachuk, V Ta'eed

    Optics Express
    |June 2, 2009
    PubMed
    Summary

    We developed a compact tunable optical filter using a microfluidic Mach-Zehnder interferometer. Its unique fluid-air interface design enables tunability with low insertion loss, achieving a -28 dB resonance depth.

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    Area of Science:

    • Optics
    • Microfluidics
    • Interferometry

    Background:

    • Mach-Zehnder interferometers are widely used for optical sensing and filtering.
    • Achieving tunability in optical filters often involves complex mechanical components or significant optical loss.

    Purpose of the Study:

    • To demonstrate a compact and tunable optical filter.
    • To leverage microfluidic principles for achieving optical path difference and tunability.
    • To minimize optical losses in a tunable filter design.

    Main Methods:

    • Fabrication of a microfluidic single beam Mach-Zehnder interferometer.
    • Utilizing the optical path difference across a fluid-air interface (meniscus) for tunability.
    • Surface treatment to optimize meniscus shape and minimize optical losses.

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    Implementation of a Reference Interferometer for Nanodetection
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    Published on: April 26, 2014

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  • Comparison of experimental optical spectra with 3D beam propagation method simulations.

    • Main Results:

    • The microfluidic interferometer demonstrated effective tunability.
    • Optical losses were minimized through meniscus shape optimization, with insertion loss maintained at -4 dB.
    • A resonance depth of -28 dB was achieved.
    • Experimental results showed good agreement with 3D beam propagation simulations.

    Conclusions:

    • A novel compact tunable filter based on a microfluidic Mach-Zehnder interferometer was successfully demonstrated.
    • The device's tunability, low insertion loss, and resonance strength were validated.
    • The microfluidic approach offers a promising method for developing advanced tunable optical devices.