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Updated: Oct 17, 2025

Author Spotlight: Microfluidic Channel-Based Soft Electrodes and Their Application in Capacitive Pressure Sensing
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Pressure sensing with high-finesse monolithic buckled-dome microcavities.

S Al-Sumaidae, L Bu, G J Hornig

    Applied Optics
    |October 8, 2021
    PubMed
    Summary

    New microcavity pressure sensors use buckled-dome Fabry-Perot designs for high sensitivity. These micro-optical devices offer improved performance over traditional sensors, enabling precise pressure measurements.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Sensor Technology

    Background:

    • Fabry-Perot cavities are optical resonators used in various applications.
    • Traditional Fabry-Perot pressure sensors often have limitations in sensitivity and finesse.
    • Developing novel microscale sensors is crucial for advanced measurement applications.

    Purpose of the Study:

    • To introduce and characterize on-chip buckled-dome Fabry-Perot microcavities as novel pressure sensing elements.
    • To investigate the relationship between external pressure and resonance wavelength shifts in these microcavities.
    • To evaluate the sensitivity and resolution of these microcavity-based pressure sensors.

    Main Methods:

    • Fabrication of sealed, on-chip buckled-dome Fabry-Perot microcavities using a controlled thin-film buckling process.
    • Characterization of optical modes and optical fiber coupling capabilities (finesse >10^3).
    • Experimental measurement of resonance wavelength shifts in response to applied external pressure.

    Main Results:

    • Demonstrated stable optical modes with high finesse (>10^3), suitable for single-mode fiber coupling.
    • Observed pressure-induced deflection of the buckled upper mirror, causing measurable resonance wavelength shifts.
    • Achieved high sensitivity (∼1 nm/kPa) due to the low thickness (<2 µm) of the buckled mirror and a resolution of ∼10 Pa.
    • Experimental results showed good agreement with theoretical predictions.

    Conclusions:

    • On-chip buckled-dome Fabry-Perot microcavities are effective and highly sensitive pressure sensing elements.
    • These microcavities offer potential advantages over traditional low-finesse, quasi-planar Fabry-Perot pressure sensors.
    • The demonstrated sensitivity and resolution highlight the potential of this technology for advanced pressure metrology.