The realization of high-Q optomechanical cavities in silicon photonic crystals enables the coupling of near-infrared photons and GHz-frequency phonons in ultra-small volumes. Such coupling enables myriads of novel phenomena (resolved sideband cooling, optomechanically induced transparency, or phonon lasing) both in the linear and nonlinear regimes. Here, we report recent advances in silicon photonic crystal optomechanical cavities beyond the linear regimes. First, we show that by combining thermal effects, free-carrier-induced refraction and optomechanical coupling is it possible to attain different states in the cavity, ranging from chaos  to phonon lasing , being easy to switch from one state to another by using an external optical source . We also show that using think mechanical links between adjacent optomechanical cavities enables to synchronize their mechanical motion via weak mechanical coupling . These results can be easily upscaled to more than two cavities and are thus the first step towards realizing integrated networks of synchronized OM oscillators, which promise an enhancement of the performance of single nano-mechanical oscillator systems and enable a novel architecture for neuromorphic computing applications
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Alejandro Martínez, Clivia M. Sotomayor-Torres, and Daniel Navarro-Urrios, "Recent advances in cavity optomechanics: from chaos and phonon lasing to mechanically-induced synchronization (Conference Presentation)," Proc. SPIE 10927, Photonic and Phononic Properties of Engineered Nanostructures IX, 109271O (Presented at SPIE OPTO: February 07, 2019; Published: 8 March 2019); https://doi.org/10.1117/12.2516245.6011670955001.
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