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    Researchers developed an all-optical system to test graphene resonators for weak-force sensing. This advanced platform achieved unprecedented force sensitivity, paving the way for next-generation sensors.

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    Area of Science:

    • Nanotechnology
    • Materials Science
    • Quantum Sensing

    Background:

    • Graphene membrane resonators are promising for weak-force sensing.
    • Sensitivity is limited by fixed device geometries and operating conditions.

    Purpose of the Study:

    • To develop an all-optical system with photothermal actuation to explore the limits of graphene resonator sensitivity.
    • To investigate the effects of device size, temperature, and optical power on resonator dynamics.

    Main Methods:

    • Utilized an all-optical interferometric system with integrated photothermal actuation.
    • Employed a self-built optical readout scheme under high-vacuum and cryogenic conditions.
    • Studied resonator dynamics at the thermomechanical noise limit.

    Main Results:

    • Achieved a force sensitivity of 5.04 × 10-18 N/√Hz.
    • Operated over a bandwidth of 22 kHz.
    • Revealed multiphysics coupling in graphene resonators.

    Conclusions:

    • The all-optical platform provides a foundation for designing high-performance nanomechanical force sensors.
    • Potential applications include quantum sensing and precision optical metrology.
    • Systematic exploration of limits enables optimization of graphene resonator sensitivity.