期刊
NATURE PHYSICS
卷 9, 期 12, 页码 806-810出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/NPHYS2798
关键词
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资金
- ETH Zurich
- Fundacio Privada CELLEX
- ERC-QMES [338763]
- ERC-Plasmolight [259196]
- ICREA Funding Source: Custom
- European Research Council (ERC) [338763] Funding Source: European Research Council (ERC)
Nano- and micromechanical oscillators with high quality (Q)-factors have gained much attention for their potential application as ultrasensitive detectors. In contrast to micro-fabricated devices, optically trapped nanoparticles in vacuum do not suffer from clamping losses, hence leading to much larger Q-factors. We find that for a levitated nanoparticle the thermal energy suffices to drive the motion of the nanoparticle into the nonlinear regime. First, we experimentally measure and fully characterize the frequency fluctuations originating from thermal motion and nonlinearities. Second, we demonstrate that feedback cooling can be used to mitigate these fluctuations. The high level of control allows us to fully exploit the force-sensing capabilities of the nanoresonator. Our approach offers a force sensitivity of 20 zN Hz(-1/2), which is the highest value reported so far at room temperature, sufficient to sense ultraweak interactions, such as non-Newtonian gravity-like forces.
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