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Article Dans Une Revue Physical Review Applied Année : 2020

Force Sensing with an Optomechanical Self-Oscillator

Résumé

Ultra-high-frequency nanomechanical resonators (f m > 300 MHz) can increase our capacity to study fast physical phenomena, for example by measuring forces. Their extreme stiffness is also a chance to access molecular forces in the subpicometer low amplitude of motion limit, but it makes them hard to drive and control. Here we analyze a method to optomechanically sense a force field with an ultrahigh-frequency and stiff mechanical resonator, where back-action optical forces set the resonator into a self-sustained stable oscillator trajectory. After elucidating the experimental conditions to obtain optimal resolution, we carry out controlled experiments where the oscillator senses an optical force generated by a secondary laser. We analyze and model our results, and illustrate the concrete advantage of the method in the measurement of such a weak force, which would otherwise remain undetected by the undriven probe. We establish the thermodynamical limits of the approach, and finally connect it to the class of feedback-controlled problems, clarifying its assets and limitations.
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Dates et versions

hal-03052627 , version 1 (10-12-2020)

Identifiants

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Biswarup Guha, Pierre Etienne Allain, Aristide Lemaitre, Giuseppe Leo, Ivan Favero. Force Sensing with an Optomechanical Self-Oscillator. Physical Review Applied, 2020, 14 (2), ⟨10.1103/PhysRevApplied.14.024079⟩. ⟨hal-03052627⟩
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