Optomechanical synchronization across multi-octave frequency spans

Caique C. Rodrigues, Cauê M. Kersul, André G. Primo, Michal Lipson, Thiago P. Mayer Alegre and Gustavo S. Wiederhecker ()
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Caique C. Rodrigues: Gleb Wataghin Physics Institute, University of Campinas
Cauê M. Kersul: Gleb Wataghin Physics Institute, University of Campinas
André G. Primo: Gleb Wataghin Physics Institute, University of Campinas
Michal Lipson: Columbia University
Thiago P. Mayer Alegre: Gleb Wataghin Physics Institute, University of Campinas
Gustavo S. Wiederhecker: Gleb Wataghin Physics Institute, University of Campinas

Nature Communications, 2021, vol. 12, issue 1, 1-9

Abstract: Abstract Experimental exploration of synchronization in scalable oscillator microsystems has unfolded a deeper understanding of networks, collective phenomena, and signal processing. Cavity optomechanical devices have played an important role in this scenario, with the perspective of bridging optical and radio frequencies through nonlinear classical and quantum synchronization concepts. In its simplest form, synchronization occurs when an oscillator is entrained by a signal with frequency nearby the oscillator’s tone, and becomes increasingly challenging as their frequency detuning increases. Here, we experimentally demonstrate entrainment of a silicon-nitride optomechanical oscillator driven up to the fourth harmonic of its 32 MHz fundamental frequency. Exploring this effect, we also experimentally demonstrate a purely optomechanical RF frequency divider, where we performed frequency division up to a 4:1 ratio, i.e., from 128 MHz to 32 MHz. Further developments could harness these effects towards frequency synthesizers, phase-sensitive amplification and nonlinear sensing.

Date: 2021
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DOI: 10.1038/s41467-021-25884-x

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