Schematic of two optically coupled optomechanical oscillators consisting of two vertically stacked, suspended Si₃N₄ disks. The arrows indicate oscillation, and the rectangle highlights the region of evanescent optical coupling. Selected for an Editors' Suggestion.

From the article:

Synchronization of Micromechanical Oscillators Using Light
Mian Zhang, Gustavo S. Wiederhecker, Sasikanth Manipatruni, Arthur Barnard, Paul McEuen, and Michal Lipson
Phys. Rev. Lett. 109, 233906 (2012)

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