Daniel Navarro-Urrios from the University of Barcelona (visiting professor of P2N group) and colleagues have replicate the synchronization of two couple pendulums using nanoscaled optomechanical resonators. Their findings shows that the network of these nano-oscillators could act as a tunable system for studying problems related to collective dynamics of pendulum-like objects.
The experiment consisted in the fabrication of two similar optomechanical resonators connected via a tin wire in their extremes. This connection provided a mechanical link between the oscillators, mimicking the original pendulum synchronization experiment of Huygen.
The modification of the “swinging” of each "pendulum" was set by using an external laser. This action caused each "pendulum" to produce oscillatory optical and mechanical signals analogous to the repeated ticks of a clock. The signals from the two initially unsynchronized crystals quickly synced up, with their “swings” moving in antiphase, meaning that the signal from one oscillator was the mirror image of the other.
These findings shown the first “unambiguously” synchronization of two optomechanical cavities.