Noise-induced temporal regularity and signal amplification in an optomechanical system with parametric instability.
Noise-induced temporal regularity and signal amplification in an optomechanical system with parametric instability.
复制标题
DOI：
10.1364/oe.26.032433
复制
发表时间：
2018-11
期刊：
影响因子：
3.8
通讯作者：
Danying Yu;Min Xie;Yanbei Cheng;B. Fan
中科院分区：
文献类型：
--
作者：
Danying Yu;Min Xie;Yanbei Cheng;B. Fan
噪声通常会对系统性能产生不受欢迎的影响。例如，在光机实验中，噪声不可避免地影响低频机械自由度。然而，我们在这里调查的有益影响的热噪声的基本光学机械系统的参数不稳定性。在一个政权附近的参数不稳定性，它被发现，在机械自由的热噪声可以维持长期的准相干振荡时，系统将保持在平衡状态。在参数不稳定性和双稳性的重叠区域中，通过加入一定量的噪声，可以诱导自持振荡态和平衡态之间的间歇性切换。当一个亚阈值周期性信号被施加到力学，自持振荡和平衡之间的切换表现出良好的周期性的速率是同步的信号频率，导致信号的显着放大。我们的研究结果加深了对光机械非线性和噪声之间相互作用的理解，并为实验观察噪声引起的光机械中的有益现象提供理论指导。
Noise usually has an unwelcome influence on system performance. For instance, noise inevitably affects the low-frequency mechanical freedom in optomechanical experiments. However, we investigate here the beneficial effects of thermal noise on a basic optomechanical system with parametric instability. In a regime near parametric instability, it is found that thermal noise in the mechanical freedom can sustain long-term quasi-coherent oscillations when the system would otherwise remain in the equilibrium state. In an overlapping regime of parametric instability and bistability, intermittent switching between a self-sustained oscillating state and an equilibrium can be induced by adding a certain amount of noise. When a subthreshold periodic signal is applied to the mechanics, the switching between the self-sustained oscillations and the equilibrium exhibits good periodicity at a rate that is synchronized to the signal frequency, resulting in a significant amplification of the signal. Our results deepen the understanding of the interplay between optomechanical nonlinearity and noise and provide theoretical guidance for experimental observation of noise-induced beneficial phenomena in optomechanics.