Quality factor enhancement of Nano electromechanical systems by capacitive driving beyond the resonance
T Barois (ILM), S Perisanu (ILM), P Poncharal (ILM), Philippe Vincent, (ILM), A Ayari (ILM)
TL;DR
This paper demonstrates that applying AC capacitive driving beyond the resonance frequency can enhance the quality factor of nanoelectromechanical systems, improving their force sensitivity and enabling self-oscillations.
Contribution
It introduces a novel method of capacitive driving above resonance to increase the quality factor of NEMS, supported by an analytical model and experimental validation.
Findings
Quality factor enhancement via high-frequency AC driving
Observation of self-oscillations under optimal conditions
Improved force sensitivity in nanoelectromechanical systems
Abstract
Nano electromechanical systems are considered as ultra sensitive devices for mass and force detection. Capacitive actuation is widely used in these devices but is known to degrade the quality factor of the resonator due to DC electrostatic damping. We report the enhancement of the quality factor of SiC vibrating nanowires detected nano optomechanically and electrically by applying an AC capacitive driving at a frequency above both the resonance frequency and the electrical cutoff frequency. Self-oscillations are demonstrated for optimal conditions. We developed an analytical model of the phenomenon and showed that it can lead to an improvement of the force sensitivity. * [email protected] 1
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