Multimode laser cooling and ultra-high sensitivity force sensing with nanowires

Abstract

Photo-induced forces can be used to manipulate and cool the mechanical motion of oscillators. When the oscillator is used as a force sensor, such as in atomic force microscopy, active feedback is an enticing route to enhancing measurement performance. Here, we show broadband multimode cooling of $-23$ dB down to a temperature of $8\pm 1$~K in the stationary regime. Through the use of periodic quiescence feedback cooling, we show improved signal-to-noise ratios for the measurement of transient signals. We compare the performance of real feedback to numerical post-processing of data and show that both methods produce similar improvements to the signal-to-noise ratio of force measurements. We achieved a room temperature force measurement sensitivity of $<2\times 10^{-16}$ N with integration time of less than $0.1$ ms. The high precision and fast force microscopy results presented will potentially benefit applications in biosensing, molecular metrology, subsurface imaging and accelerometry.

16 pages and 3 figures for the main text, 14 pages and 5 figures for the supplementary information

References in corpus (5)

• Millikelvin cooling of an optically trapped microsphere in vacuum
• Feedback cooling of a cantilever's fundamental mode below 5 mK
• High-sensitivity optical monitoring of a micro-mechanical resonator with a quantum-limited optomechanical sensor
• Feedback cooling of the normal modes of a massive electromechanical system to submillikelvin temperature
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Cited by in corpus (13)

• A self-calibrating optomechanical force sensor with femtonewton resolution
• Mechanical oscillator thermometry in the nonlinear optomechanical regime
• Growing macroscopic superposition states via cavity quantum optomechanics
• Solid-state laser refrigeration of a semiconductor optomechanical resonator
• Probing of nonlinear hybrid optomechanical systems via partial accessibility
• Simultaneous cooling of coupled mechanical oscillators using whispering gallery mode resonances
• Quantum Feedback Cooling of a Mechanical Oscillator Using Variational Measurements:Tweaking Heisenberg's Microscope
• Dueling Dynamical Backaction in a Cryogenic Optomechanical Cavity
• Nonstationary force sensing under dissipative mechanical quantum squeezing
• Optical back-action on the photothermal relaxation rate
• Synthesis of optical spring potentials in optomechanical systems
• Discrete-time reservoir engineering with entangled bath and stabilizing squeezed states
• Enhanced photothermal cooling of nanowires