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    Area of Science:

    • Physics
    • Engineering
    • Materials Science

    Background:

    • Mass sensing relies on detecting frequency shifts in mechanical oscillators.
    • Current limitations in mass sensing are tied to the mechanical frequency resolution of oscillators.

    Purpose of the Study:

    • To develop a method for magnifying minute mechanical frequency shifts.
    • To enhance the sensitivity and resolution of mechanical mass sensors.

    Main Methods:

    • Proposing a technique to enlarge small frequency shifts of a mechanical oscillator into large shifts of a normal mode.
    • Leveraging sensitivity near the quantum critical point of an electromechanical system.

    Main Results:

    • Achieved a 5-order-of-magnitude enhancement in frequency shift, magnifying a 20 Hz shift to 1 MHz.
    • Demonstrated the resolution of a 1 Hz mechanical frequency shift with a 11 MHz mechanical resonance frequency.
    • Attained an ultrasensitive mass sensor resolution of Δm/m∼10-8.

    Conclusions:

    • The proposed method significantly boosts the sensitivity of mechanical mass sensors.
    • This technique offers potential applications in ultrasensitive mass sensing and other frequency-shift-based measurements.