Detection of weak forces based on noise-activated switching in bistable optomechanical systems
Detection of weak forces based on noise-activated switching in bistable optomechanical systems
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DOI：
10.1103/physreva.90.063810
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发表时间：
2014-12-09
影响因子：
2.9
通讯作者：
Nunnenkamp, Andreas
中科院分区：
文献类型：
--
作者：
Aldana, Samuel;Bruder, Christoph;Nunnenkamp, Andreas
我们建议使用腔光学机械系统的光学双稳态的检测弱谐波力的制度。由于光机械耦合，机械振荡器上的外力调制腔的谐振频率，并因此调制两个谐振分支之间的切换速率。腔输出场的大差异则导致强烈放大的零差信号。我们确定的开关率作为腔失谐量的函数，从广泛的随机主方程的数值模拟，适当的连续零差检测。我们开发了一个两态速率方程模型，定量描述了慢开关动态。这个模型是解决了一个弱的谐波力的存在下，获得近似的功率增益和信号-噪声比，我们然后比较力检测与光学机械系统在线性政权的表达式解析。
We propose to use cavity optomechanical systems in the regime of optical bistability for the detection of weak harmonic forces. Due to the optomechanical coupling an external force on the mechanical oscillator modulates the resonance frequency of the cavity and consequently the switching rates between the two bistable branches. A large difference in the cavity output fields then leads to a strongly amplified homodyne signal. We determine the switching rates as a function of the cavity detuning from extensive numerical simulations of the stochastic master equation as appropriate for continuous homodyne detection. We develop a two-state rate equation model that quantitatively describes the slow switching dynamics. This model is solved analytically in the presence of a weak harmonic force to obtain approximate expressions for the power gain and signal-to-noise ratio that we then compare to force detection with an optomechanical system in the linear regime.