论文标题
悬浮的光学振荡器的注射锁定用于精确力传感
Injection locking of a levitated optomechanical oscillator for precision force sensing
论文作者
论文摘要
我们报告了光学悬浮的纳米力学振荡器（硅纳米球）的注射锁定，以使外部光学信号的共振强度调制。我们探讨了该系统中注射锁定的特征，例如相得出的效果和注入引起的振荡线宽的降低。我们的测量值与理论预测非常吻合，并加深了悬浮的光学系统中注射锁定的类比，而光学系统与光学系统（Lasers）中的锁定系统相吻合。通过测量反馈冷却的自由运行振荡器的力噪声，我们达到了$ \ sim23〜 \ rm {zn}/\ sqrt {\ rm {hz}} $的力灵敏度。在相当短的整合时间中，这很容易允许测试违反牛顿重力并寻找新的小型力量。作为概念的证明，我们表明可以利用注射锁定来测量在悬浮的纳米颗粒上光学诱导的力，并在光学结合和纠缠的探索中的潜在应用在光学耦合的纳米力学振荡器之间。
We report on the injection locking of an optically levitated nanomechanical oscillator (a silica nanosphere) to resonant intensity modulations of an external optical signal. We explore the characteristic features of injection locking in this system, e.g. the phase pull-in effect and the injection-induced reduction of the oscillation linewidth. Our measurements are in good agreement with theoretical predictions and deepen the analogy of injection locking in levitated optomechanical systems to that in optical systems (lasers). By measuring the force noise of our feedback cooled free-running oscillator, we attain a force sensitivity of $\sim23~\rm{zN}/\sqrt{\rm{Hz}}$. This can readily allow, in fairly short integration times, for tests of violations of Newtonian gravity and searching for new small-scale forces. As a proof of concept, we show that the injection locking can be exploited to measure the forces optically induced on levitated nanoparticles, with potential applications in explorations of optical binding and entanglement between optically coupled nanomechanical oscillators.
