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Article Dans Une Revue Nature Communications Année : 2021

Ultrasensitive nano-optomechanical force sensor operated at dilution temperatures

Résumé

Cooling down nanomechanical force probes is a generic strategy to enhance their sensitivities through the concomitant reduction of their thermal noise and mechanical damping rates. However, heat conduction mechanisms become less efficient at low temperatures, which renders difficult to ensure and verify their proper thermalization. To operate with minimally perturbing measurements, we implement optomechanical readout techniques operating in the photon counting regime to probe the dynamics of suspended silicon carbide nanowires in a dilution refrigerator. Readout of their vibrations is realized with sub-picowatt optical powers, in a regime where less than one photon is collected per oscillation period. We demonstrate their thermalization down to $32\pm2$ mK and report on record sensitivities for scanning probe force sensors, at the $40\,\rm zN/Hz^{1/2}$ level, with a sensitivity to lateral force field gradients in the fN/m range. This work opens the road toward nanomechanical vectorial imaging of faint forces at dilution temperatures, at minimal excitation levels.
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Dates et versions

hal-03042603 , version 1 (07-12-2020)

Identifiants

Citer

Francesco Fogliano, Benjamin Besga, Antoine Reigue, Laure Mercier de Lépinay, Philip Heringlake, et al.. Ultrasensitive nano-optomechanical force sensor operated at dilution temperatures. Nature Communications, 2021, 12, pp.4124. ⟨10.1038/s41467-021-24318-y⟩. ⟨hal-03042603⟩

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