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- Title
Giant injection-locking bandwidth of a self-pulsing limit-cycle in an optomechanical cavity.
- Authors
Navarro-Urrios, Daniel; Arregui, Guillermo; Colombano, Martín F.; Jaramillo-Fernández, Juliana; Pitanti, Alessandro; Griol, Amadeu; Mercadé, Laura; Martínez, Alejandro; Capuj, Néstor E.
- Abstract
Locking of oscillators to ultra-stable external sources is of paramount importance for improving close-to-carrier phase noise in free running oscillators. In most of them, such as Micro-Electro-Mechanical-Systems or LC circuit-based oscillators, the locking frequency range is limited by the robustness of their natural frequency, which comes explicitly related with intrinsic parameters of the system. In this work we report the synchronization of an optically-driven self-pulsing limit-cycle taking place in a silicon optomechanical crystal cavity to an external harmonic signal that modulates the driving laser. Because of the extreme ductility of the natural self-pulsing frequency (several tens of MHz), the injection-locking mechanism is highly efficient and displays giant relative bandwidths exceeding 60%. The external modulation reveals itself as a knob to explore dynamical attractors that are otherwise elusive and, in particular, as a means to initialize a mechanical resonator into a state of self-sustained oscillations driven by radiation pressure forces. Moreover, we exploit the large anharmonicity of the studied limit-cycle to induce injection-locking to integer multiples and fractions of the frequency of the external reference, which can be used for frequency conversion purposes in nano-electro-opto-mechanical systems. Locking of oscillators to ultra-stable external sources is of paramount importance for improving close-to-carrier phase noise in free running oscillators. Here, the authors demonstrate a giant phase-locking bandwidth exceeding 60% of the natural frequency of the oscillator, which greatly overcomes other approaches exploiting external locking.
- Subjects
PHASE noise; BANDWIDTHS; RADIATION pressure; MODE-locked lasers; SILICON crystals; ANHARMONIC motion
- Publication
Communications Physics, 2022, Vol 5, Issue 1, p1
- ISSN
2399-3650
- Publication type
Article
- DOI
10.1038/s42005-022-01113-9