Figure 8.

Experimental realization of synchronization. (a) Phase synchronization in a mechanically coupled pair of doubly clamped beams [87]. One beam is excited at different orders of subharmonics of fundamental resonance and the second beam response content around the first mode is recorded which gives Arnold's tongues. Different ranges of entrainment are shown in devil's staircase plot. (b) Phase synchronization in a micro disc having a 3 : 1 subharmonic frequency relationship [88]. Synchronization range measured for upwards and downwards frequency sweeps. (c) Phase synchronization using light [89]. Optically coupled optomechanical systems can synchronize their mechanical oscillations when the input optical power is sufficient. The bottom contour map (the frequency spectrum with respect to the relative laser frequency on y-axis and the oscillator frequency on x-axis) shows that the two self-sustained oscillators with a mismatched frequency (below the white line) get synchronized (above the white line). (Online version in colour.)