AFM微杠杆中测辐射热反向action的机械模式依赖性
Mechanical mode dependence of bolometric back-action in an AFM microlever
摘要：
基于光学腔的探测装置产生的两个反作用过程可以深刻地改变AFM微杠杆的动力学行为：光热力或辐射压力。而噪声阻尼或放大取决于光腔响应的辐射压力BA，我们目前的实验结果进行真空下，在室温下的光热BA过程中，似乎是更复杂的。我们第一次表明，它可以同时作用于两个振动模式在相反的方向：一个模式的噪声被放大，而它是阻尼的另一种模式。光热BA的基本模型表明，对机械模式的动力学效应是激光光斑位置依赖于相对于模式形状。这种分析解释了所观察到的不同模式的相反行为。
英文摘要：
Two back action (BA) processes generated by an optical cavity based detection device can deeply transform the dynamical behavior of an AFM microlever: the photothermal force or the radiation pressure. Whereas noise damping or amplifying depends on optical cavity response for radiation pressure BA, we present experimental results carried out under vacuum and at room temperature on the photothermal BA process which appears to be more complex. We show for the first time that it can simultaneously act on two vibration modes in opposite direction: noise on one mode is amplified whereas it is damped on another mode. Basic modeling of photothermal BA shows that dynamical effect on mechanical mode is laser spot position dependent with respect to mode shape. This analysis accounts for opposite behaviors of different modes as observed.
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