Phononic Frequency Combs via Nonlinear Resonances

TL;DR

This paper explores how nonlinear resonances in driven phononic systems can generate frequency combs, similar to optical systems, with potential applications in phonon harvesting and entanglement.

Contribution

It introduces a novel mechanism for phononic frequency combs based on nonlinear resonances, expanding the understanding of nonlinear acoustic phenomena.

Findings

Frequency combs characterized by equidistant spectral lines in phononic modes.

Higher order nonlinear resonances enable correlation tailoring.

Potential applications in phonon harvesting and entanglement generation.

Abstract

We study the analogue of optical frequency combs in driven nonlinear phononic systems, and present a new generation mechanism for phononic frequency combs via nonlinear resonances. The nonlinear resonance refers to the simultaneous excitation of a set of phonon modes by the external driving, and thereby generated frequency combs are characterized by an array of equidistant spectral lines in the spectrum of each nonlinearly excited phonon mode. Frequency combs via nonlinear resonance of different orders are investigated, and particularly we reveal the possibility for correlation tailoring in higher order cases. The investigation contributes to potential applications in various nonlinear acoustic processes, such as harvesting phonons and generating phonon entanglements, and can also be generalized to other nonlinear systems.