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

Abstract

Cavity optomechanics has become a powerful tool to manipulate mechanical motion via optical fields. When driving an optomechanical cavity with blue-detuned laser the mechanical motion is amplified, ultimately resulting in phonon lasing. In this work, we show that a silicon optomechanical crystal cavity can be used as an optoelectronic oscillator when driven to the phonon lasing condition. To this end, we use an optomechanical cavity designed to have a breathing-like mechanical mode vibrating at ${\Omega }_m/2\pi =$3.897 GHz in a full phononic bandgap. Our measurements show that the first harmonic displays a phase noise of -100 dBc/Hz at 100 kHz, which is a considerable value for a free running oscillator. Stronger blue-detuned driving leads eventually to the formation of an optomechanical frequency comb, with lines 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 adjusted to a theoretical model recently presented. Our results suggest that silicon optomechanical cavities could be relevant elements in microwave photonics and optical RF processing, in particular in disciplines requiring low-weight, compactness and fiber interconnection.

References in corpus (24)

• Cavity Optomechanics
• Laser cooling of a nanomechanical oscillator into its quantum ground state
• Optical frequency comb generation from a monolithic microresonator
• Optomechanically induced transparency
• Electromagnetically Induced Transparency and Slow Light with Optomechanics
• Optomechanical Crystals
• Analysis of radiation-pressure induced mechanical oscillation of an optical microcavity
• Optical frequency comb technology for ultra-broadband radio-frequency photonics
• Phonon laser action in a tunable, two-level photonic molecule
• Quantum transduction of optical photons from a superconducting qubit
• Nonreciprocity and magnetic-free isolation based on optomechanical interactions
• Brillouin Lasing with a CaF_2 Whispering Gallery Mode Resonator
• Optimized optomechanical crystal cavity with acoustic radiation shield
• Controlling phonons and photons at the wavelength-scale: silicon photonics meets silicon phononics
• A 1D Optomechanical crystal with a complete phononic band gap
• Nonlinear dynamics and chaos in an optomechanical beam
• Nonlinear radiation pressure dynamics in an optomechanical crystal
• Synchronization of optomechanical cavities by mechanical interaction
• Unifying Brillouin scattering and cavity optomechanics
• An integrated low phase noise radiation-pressure-driven optomechanical oscillator chipset
• A Monolithic Radiation-Pressure Driven, Low Phase Noise Silicon Nitride Opto-Mechanical Oscillator
• A self-stabilized coherent phonon source driven by optical forces
• Phase Noise Modeling of Opto-Mechanical Oscillators
• Optical and mechanical mode tuning in an optomechanical crystal with light-induced thermal effects

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• Experimental Evaluation of All-Optical Up- and Down-Conversion of 3GPP 5G NR Signals using an Optomechanical Crystal Cavity Frequency Comb
• Dispersive optomechanics of supercavity modes in high-index disks
• Vertical engineering for large stimulated Brillouin scattering in unreleased silicon-based waveguides
• Engineered entropic forces allow ultrastrong dynamical backaction
• Surface acoustic wave lasing in a silicon optomechanical cavity
• Room-temperature silicon platform for GHz-frequency nano-electro-opto-mechanical systems
• Testing optomechanical microwave oscillators for SATCOM application