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Zhenmin Chen, Ming Li, Xiang Wu

    Optics Express
    |July 21, 2015
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    This study introduces a novel optofluidic sensor that measures both refractive index and sound speed changes simultaneously. This dual-mode sensing enhances detection capabilities for analytes unresponsive to refractive index variations.

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    Area of Science:

    • Optofluidics
    • Acoustic Sensing
    • Optical Resonance

    Background:

    • Traditional optical sensors rely on refractive index changes.
    • Some analytes do not exhibit significant refractive index shifts.
    • A need exists for supplementary sensing modalities.

    Purpose of the Study:

    • To develop a novel sensing scheme for optofluidic micro-bubble resonators.
    • To simultaneously measure optical refractive index and sound speed changes.
    • To create a 2-D sensing map for enhanced analyte detection.

    Main Methods:

    • Utilizing an optofluidic thin-wall micro-bubble resonator.
    • Simultaneously measuring whispering gallery mode resonance shifts (optical sensing).
    • Simultaneously measuring optomechanical resonance shifts (sound speed sensing).

    Main Results:

    • Achieved sound speed sensitivity of 4.2-6.8 MHz/(km/s) across three mechanical modes.
    • Successfully plotted a 2-D optical/opto-mechanical sensing map.
    • Demonstrated a supplementary sensing capability for refractive index-insensitive analytes.

    Conclusions:

    • The novel dual-mode sensing scheme offers enhanced detection capabilities.
    • This approach provides valuable supplementary data when optical sensing alone is insufficient.
    • Optofluidic resonators can be engineered for multi-modal sensing applications.