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Tunable optofluidic liquid metal core microbubble resonator.

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    Researchers developed a novel microbubble resonator using liquid metal. This device enables thermal tuning of optical and mechanical modes by over 300°C via Ohmic heating, advancing opto-mechano-fluidic applications.

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    Area of Science:

    • Opto-mechano-fluidics
    • Microscale resonators
    • Liquid metal applications

    Background:

    • Optical microcavities are crucial for sensing and photonics.
    • Integrating optical, mechanical, and fluidic properties presents challenges.
    • Liquid metals offer unique thermal and conductive properties.

    Purpose of the Study:

    • To design and couple optical WGM mode and mechanical mode in a microbubble resonator (MBR) with a liquid metal core.
    • To investigate thermal tuning capabilities of the MBR using Ohmic heating.
    • To explore the potential of liquid metal MBRs in tunable opto-mechano-fluidic systems.

    Main Methods:

    • Fabrication of a microbubble resonator with a silica shell and liquid metal core.
    • Application of electrical current to the liquid metal core for Ohmic heating.
    • Characterization of optical and mechanical mode tuning in response to temperature changes.

    Main Results:

    • Achieved significant thermal tuning of the optical mode (>3 nm) over a full free spectral range.
    • Demonstrated thermal tuning of the mechanical mode with a relative range of 9%.
    • Successfully controlled MBR temperature by over 300 °C via Ohmic heating.

    Conclusions:

    • The developed liquid metal MBR allows for substantial thermal tuning of both optical and mechanical modes.
    • Ohmic heating of the liquid metal core is an effective method for precise temperature control and mode tuning.
    • This technology offers a promising platform for tunable opto-mechano-fluidic devices.