Unidirectional Transverse Scattering in Acoustic Dimers

TL;DR

This paper demonstrates how a two-dimensional acoustic dimer can achieve unidirectional transverse scattering through inter-particle coupling, enabling effective acoustic beam steering and wave routing.

Contribution

It introduces a coupled multipole model showing that a dimer can support a transverse Kerker effect with strong directionality and scattering, unlike single particles.

Findings

Dimer supports a transverse Kerker effect under plane wave excitation.

Inter-particle coupling enables effective monopole-dipole interference.

The regime allows for compact acoustic beam steering and wave routing.

Abstract

We study unidirectional transverse scattering in a two-dimensional acoustic dimer composed of two isotropic subwavelength scatterers. Using a coupled multipole model, we show that inter-particle coupling enables effective monopole-dipole interference and supports a transverse Kerker effect under plane wave excitation. In contrast to a single non-absorbing isotropic particle, where Kerker-type cancellation is only approached in the weak-scattering limit, the dimer can combine pronounced directionality with strong overall scattering. This regime is promising for compact acoustic beam steering and directional wave routing.