A frequency-preserving and time-invariant metamaterial-based nonlinear acoustic diode

TL;DR

This paper introduces a novel, frequency-preserving, time-invariant acoustic diode using metamaterials and nonlinear effects, enabling switchable one-way sound transmission with potential practical applications.

Contribution

It presents the first realization of a frequency-preserving, time-invariant acoustic diode that is switchable, combining nonlinear effects and metamaterials for improved control of sound propagation.

Findings

Numerical study confirms diode functionality.

Preliminary experimental results demonstrate feasibility.

Device is switchable and preserves frequency.

Abstract

We present the realization of an acoustic diode or rectifier, exploiting symmetry-breaking nonlinear effects like harmonic generation and wave mixing and the filtering capabilities of metamaterials. The essential difference and advantage compared with previous acoustic diode realizations is that the present is simultaneously a time invariant, frequency preserving and switchable device. This allows its application also as an on-off or amplitude-tuning switch. We evaluate its properties by means of a numerical study and demonstrate its feasibility in a preliminary experimental realization. This work may provide new opportunities for the practical realization of structural components with one-way wave propagation properties.