由噪声和窄带场驱动的光力学
Optomechanics driven by noisy and narrowband fields
AI总结：
研究窄带噪声和结构化电磁场驱动的腔光力学系统，发现蓝失谐噪声驱动可诱导机械振荡反阻尼和自振荡，且当噪声带宽接近机械阻尼时阈值发生显著偏移，双相干音驱动也偏离传统描述。
摘要：
我们报告了对由窄带电磁场驱动的腔光力学系统的研究，这些电磁场以非相关噪声或更具结构化谱的形式施加。驱动谱的带宽小于机械共振频率，因此我们可以使用解析边带极限下常规腔光力学中熟悉的概念来描述由此产生的物理现象。在蓝失谐噪声驱动下，噪声诱导的相互作用导致机械振荡器的反阻尼，并在平均噪声功率与相干驱动音相当的水平上出现自振荡阈值。这一过程可被视为机械运动的噪声诱导动力学放大。然而，当噪声带宽减小到与机械阻尼同量级时，我们发现了自振荡功率阈值的巨大偏移。这是由于振荡器绝热地跟随瞬时噪声分布。除蓝失谐噪声驱动外，我们还研究了由频率相近的两个相干驱动音组成的窄带驱动。在这些情况下，我们也观察到了与仅依赖音频率和功率的朴素光力学描述的偏差。
英文摘要：
We report a study of a cavity optomechanical system driven by narrow-band electromagnetic fields, which are applied either in the form of uncorrelated noise, or as a more structured spectrum. The bandwidth of the driving spectra is smaller than the mechanical resonant frequency, and thus we can describe the resulting physics using concepts familiar from regular cavity optomechanics in the resolved-sideband limit. With a blue-detuned noise driving, the noise-induced interaction leads to anti-damping of the mechanical oscillator, and a self-oscillation threshold at an average noise power that is comparable to that of a coherent driving tone. This process can be seen as noise-induced dynamical amplification of mechanical motion. However, when the noise bandwidth is reduced down to the order of the mechanical damping, we discover a large shift of the power threshold of self-oscillation. This is due to the oscillator adiabatically following the instantaneous noise profile. In addition to blue-detuned noise driving, we investigate narrow-band driving consisting of two coherent drive tones nearby in frequency. Also in these cases, we observe deviations from a naive optomechanical description relying only on the tones' frequencies and powers.
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