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Floquet Phonon Lasing in Multimode Optomechanical Systems.

Laura Mercadé¹, Karl Pelka², Roel Burgwal^3,4

¹Nanophotonics Technology Center, Universitat Politècnica de Valencia, Camino de Vera s/n, 46022 Valencia, Spain.

Physical Review Letters

|August 30, 2021

Summary

This summary is machine-generated.

Researchers achieved mode-locked, multimode phonon lasing in optomechanical systems using a modulated laser drive. This breakthrough enhances frequency stability for advanced oscillators and waveform synthesis.

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Area of Science:

Cavity optomechanics
Quantum optics
Nanophotonics

Background:

Dynamical radiation pressure in cavity optomechanical systems induces self-sustained oscillations, known as phonon lasing, enabling stable GHz-frequency nanoscale oscillators.
Typically, phonon lasing is confined to a single mechanical mode, similar to single-mode photonic lasers.

Purpose of the Study:

To demonstrate mode-locked, multimode phonon lasing in an optomechanical system.
To investigate the use of Floquet dynamics for achieving multimode phonon lasing.
To enhance the frequency stability of optomechanical oscillators.

Main Methods:

Utilizing a temporally modulated laser drive to induce Floquet dynamics.
Engineering a silicon photonic nanocavity coupled to multiple GHz-frequency mechanical modes.
Analyzing the spectral properties and frequency stability of the multimode lasing state.

Main Results:

Successfully established mode-locked, multimode phonon lasing in the engineered optomechanical system.
Observed significant improvement in long-term frequency stability due to mode locking.
Demonstrated the feasibility of controlling phonon lasing across multiple mechanical modes.

Conclusions:

Mode-locked, multimode phonon lasing is achievable in optomechanical systems via Floquet dynamics.
This approach offers enhanced frequency stability compared to single-mode phonon lasing.
Opens avenues for ultracompact oscillators, pulsed phonon lasing, coherent waveform synthesis, and many-mode phenomena.