Fig. 7. Electrode-displacement modulation experiments with PC1. (a) Anti-phase, double-frequency and in-phase responses to the piezo voltage. The dip-to-peak piezo voltage modulation corresponds to an electrode displacement of 5 Å. We apply the piezo voltage signal at a frequency of 5 Hz. Note that the electrode displacement increases (decreases) as the piezo voltage increases (decreases). (b) Triple-frequency response to the piezo voltage. The red-shaded area is a guide to the eye for a half-period modulation.
