Experimental Investigation of Acoustic Kerker Effect in Labyrinthine Resonators

TL;DR

This paper experimentally demonstrates the acoustic Kerker effect in labyrinthine resonators, enabling directional sound scattering control through engineered interference of resonances, validated by measurements and simulations.

Contribution

First experimental realization of the acoustic Kerker effect in a 2D labyrinthine resonator, showing controlled directional scattering via resonance interference.

Findings

Directional scattering achieved at Kerker conditions

Good agreement between measurements and simulations

Feasibility of wave control in acoustic metamaterials

Abstract

Controlling the directionality of the acoustic scattering with single acoustic metaatoms has a key importance for reaching spatial routing of sound with acoustic metamaterials. In this paper, we present the experimental demonstration of the acoustic analogue of the Kerker effect realized in a two-dimensional coiled-space metaatom. By engineering the interference between monopolar and dipolar resonances within a high-index acoustic metaatom, we achieve directional scattering with suppressed backward or forward response at the first and second Kerker conditions respectively. Experimental measurements of the scattered pressure field, in a parallel-plate waveguide environment, show good agreement with the full-wave simulations. Our results validate the feasibility of Kerker-inspired wave control in acoustic systems and open new opportunities for directional sound manipulation.