Figure 4.

(a) Experimental amplitude response of an acoustically excited microcantilever oscillating in water, showing a noisy peak not accurately fitted by the theoretical amplitude curve; (b) dependence of the amplitude response of a microcantilever on the gain of the feedback loop in the Q-control method, for ${\omega }_0=1$ rad/s, original $Q=10$ (for G = 0), $\frac{F_0}{m_{\mathrm{eff}}}=1$ N/kg and $\varphi =\frac{\pi }{2}$ rad.