Force Sensing with an Optomechanical Self-Oscillator
Force Sensing with an Optomechanical Self-Oscillator
复制标题
DOI：
10.1103/physrevapplied.14.024079
复制
发表时间：
2020-08-26
影响因子：
4.6
通讯作者：
Favero, Ivan
中科院分区：
文献类型：
--
作者：
Guha, Biswarup;Allain, Pierre Etienne;Favero, Ivan
超高频纳米机械谐振器 (fm 300 MHz) 可以提高我们研究快速物理现象的能力，例如通过测量力。它们的极端刚度也是在亚皮米低运动极限幅度下获得分子力的机会，但这使得它们难以驱动和控制。在这里，我们分析了一种使用超高频和刚性机械谐振器来光机械感测力场的方法，其中反作用光学力将谐振器设置为自持稳定的振荡器轨迹。在阐明获得最佳分辨率的实验条件后，我们进行了受控实验，其中振荡器感测次级激光器产生的光学力。我们对结果进行分析和建模，并说明该方法在测量这种弱力方面的具体优势，否则非驱动探针将无法检测到这种弱力。我们建立了该方法的热力学极限，最后将其与反馈控制问题类联系起来，阐明了其优点和局限性。
Ultra-high-frequency nanomechanical resonators (fm 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 ultra-high-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.