论文标题
平衡的光力共振自激共振
Out-of-equilibrium optomechanical resonance self-excitation
论文作者
论文摘要
原子力显微镜的基本灵敏度极限与悬臂振荡的热噪声密切相关。 A method to suppress this unwanted noise is to reduce the bandwidth of the measurement, but this approach is limited by the speed of the measurement and the width of the cantilever resonance, commonly defined through the quality factor Q. However, it has been shown that optomechanical resonances in interferometers might affect the cantilever oscillations resulting in an effective quality factor Q$_{eff}$ .当激光功率充分增加时，悬臂振荡甚至可能达到自振荡的政权。在这种自振荡状态下，系统的噪声部分是由与激光光的相互作用远离平衡确定的。在这里，我们展示并讨论激光功率的调整如何导致非线性光机械效应，从而大大增加悬臂的有效质量因子，从而导致悬臂过平衡噪声。我们使用阻尼系数的第四阶非线性对效果进行建模。
The fundamental sensitivity limit of atomic force microscopy is strongly correlated to the thermal noise of the cantilever oscillation. A method to suppress this unwanted noise is to reduce the bandwidth of the measurement, but this approach is limited by the speed of the measurement and the width of the cantilever resonance, commonly defined through the quality factor Q. However, it has been shown that optomechanical resonances in interferometers might affect the cantilever oscillations resulting in an effective quality factor Q$_{eff}$ . When the laser power is sufficiently increased the cantilever oscillations might even reach the regime of self-oscillation. In this self-oscillation state, the noise of the system is partially determined by the interaction with the laser light far from equilibrium. Here, we show and discuss how tuning of the laser power leads to nonlinear optomechanical effects that can dramatically increase the effective quality factor of the cantilever leading to out-of-equilibrium noise. We model the effects using a fourth order nonlinearity of the damping coefficient.
