Synchronization of Optomechanical Nanobeams by Mechanical Interaction

Colombano, Martín F.; Arregui, Guillermo; Capuj, N. E.; Pitanti, Alessandro; Maire, Jérémie; Griol, Amadeu; Garrido, B.; Martı́nez, Alejandro; Torres, C. M. Sotomayor; Navarro-Urriós, D.

doi:10.1103/physrevlett.123.017402

Cited by 65 publications

(69 citation statements)

References 45 publications

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“…However, the mechanical modes within the bandgap in the cavity demonstrated in a study by Gomis-Bresco et al [23] exhibit low g 0 /2π values, being the breathing mechanical mode located out of the phononic bandgap. As a result, the excitation of these modes is not efficient and, in general, all injected energy goes to the nanobeam flexural modes (oscillating at tens of MHz), which has been successfully used to demonstrate phonon lasing [24], chaotic dynamics [25] and, more recently, synchronization [26]. This basic OM structure can be further engineered so that breathing-like mechanical modes appear within the full bandgap, as shown in a study by Oudich [27].…”

Section: A One-dimensional (1d) Om Crystal Cavity With a Full Phononimentioning

confidence: 99%

Microwave oscillator and frequency comb in a silicon optomechanical cavity with a full phononic bandgap

et al. 2020

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Cavity optomechanics has recently emerged as a new paradigm enabling the manipulation of mechanical motion via optical fields tightly confined in deformable cavities. When driving an optomechanical (OM) crystal cavity with a laser blue-detuned with respect to the optical resonance, the mechanical motion is amplified, ultimately resulting in phonon lasing at MHz and even GHz frequencies. In this work, we show that a silicon OM crystal cavity performs as an OM microwave oscillator when pumped above the threshold for self-sustained OM oscillations. To this end, we use an OM cavity designed to have a breathing-like mechanical mode at 3.897 GHz in a full phononic bandgap. Our measurements show that the first harmonic of the detected signal displays a phase noise of ≈−100 dBc/Hz at 100 kHz. Stronger blue-detuned driving leads eventually to the formation of an OM frequency comb, whose lines are spaced by the mechanical frequency. We also measure the phase noise for higher-order harmonics and show that, unlike in Brillouin oscillators, the noise is increased as corresponding to classical harmonic mixing. Finally, we present real-time measurements of the comb waveform and show that it can be fitted to a theoretical model recently presented. Our results suggest that silicon OM cavities could be relevant processing elements in microwave photonics and optical RF processing, in particular in disciplines requiring low weight, compactness and fiber interconnection.

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Section: A One-dimensional (1d) Om Crystal Cavity With a Full Phononimentioning

confidence: 99%

Microwave oscillator and frequency comb in a silicon optomechanical cavity with a full phononic bandgap

et al. 2020

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“…Nanoscale optomechanical cavities (OMCs) [1] promise a route toward flexible, efficient and reliable interfaces to transfer classical and or quantum information between microwave and optical frequency domains in a single chip. In the nonlinear regime, these devices are very attractive for room temperature applications, such as mass sensing [2], nonvolatile memories [3], chaos-based applications [4] and coupled oscillator networks for neuromorphic computing [5,6], among others. The strong interaction between light and mechanical modes has been demonstrated in OMCs made of silicon nitride (Si 3 N 4 ) [7], gallium arsenide (GaAs) [8], aluminum nitride (AlN) [9,10], diamond [11,12] and crystalline silicon (c-Si) [13,14].…”

Section: Introductionmentioning

confidence: 99%

Properties of nanocrystalline silicon probed by optomechanics

et al. 2020

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Nanocrystalline materials exhibit properties that can differ substantially from those of their single crystal counterparts. As such, they provide ways to enhance and optimize their functionality for devices and applications. Here, we report on the optical, mechanical and thermal properties of nanocrystalline silicon probed by means of optomechanical nanobeams to extract information of the dynamics of optical absorption, mechanical losses, heat generation and dissipation. The optomechanical nanobeams are fabricated using nanocrystalline films prepared by annealing amorphous silicon layers at different temperatures. The resulting crystallite sizes and the stress in the films can be controlled by the annealing temperature and time and, consequently, the properties of the films can be tuned relatively freely, as demonstrated here by means of electron microscopy and Raman scattering. We show that the nanocrystallite size and the volume fraction of the grain boundaries play a key role in the dissipation rates through nonlinear optical and thermal processes. Promising optical (13,000) and mechanical (1700) quality factors were found in the optomechanical cavity realized in the nanocrystalline Si resulting from annealing at 950°C. The enhanced absorption and recombination rates via the intragap states and the reduced thermal conductivity boost the potential to exploit these nonlinear effects in applications including Nanoelectromechanical systems (NEMS), phonon lasing and chaos-based devices.

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“…More recent studies have exploited the coupling of several OM limit cycle oscillators to explore OM synchronization dynamics. OM synchronization was first predicted theoretically in [41], later observed experimentally for few-mode systems [42][43][44][45], and analyzed in subsequent theoretical studies of large-scale lattice dynamics [46][47][48][49].…”

Section: Introductionmentioning

confidence: 99%

Nonlinear dynamics of weakly dissipative optomechanical systems

2020

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Optomechanical systems attract a lot of attention because they provide a novel platform for quantum measurements, transduction, hybrid systems, and fundamental studies of quantum physics. Their classical nonlinear dynamics is surprisingly rich and so far remains underexplored. Works devoted to this subject have typically focussed on dissipation constants which are substantially larger than those encountered in current experiments, such that the nonlinear dynamics of weakly dissipative optomechanical systems is almost uncharted waters. In this work, we fill this gap and investigate the regular and chaotic dynamics in this important regime. To analyze the dynamical attractors, we have extended the 'generalized alignment index' method to dissipative systems. We show that, even when chaotic motion is absent, the dynamics in the weakly dissipative regime is extremely sensitive to initial conditions. We argue that reducing dissipation allows chaotic dynamics to appear at a substantially smaller driving strength and enables various routes to chaos. We identify three generic features in weakly dissipative classical optomechanical nonlinear dynamics: the Neimark-Sacker bifurcation between limit cycles and limit tori (leading to a comb of sidebands in the spectrum), the quasiperiodic route to chaos, and the existence of transient chaos.

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Synchronization of Optomechanical Nanobeams by Mechanical Interaction

Cited by 65 publications

References 45 publications

Microwave oscillator and frequency comb in a silicon optomechanical cavity with a full phononic bandgap

Microwave oscillator and frequency comb in a silicon optomechanical cavity with a full phononic bandgap

Properties of nanocrystalline silicon probed by optomechanics

Nonlinear dynamics of weakly dissipative optomechanical systems

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