Acoustic resonators: symmetry classification and multipolar content of the eigenmodes

TL;DR

This paper introduces a symmetry-based multipole classification method for analyzing acoustic resonator eigenmodes, enabling efficient design of resonators with desired properties without extensive simulations.

Contribution

It presents a group theory-based approach for qualitative analysis of resonator eigenmodes, linking symmetry to multipolar content and scattering characteristics.

Findings

Full multipole symmetry classification for various resonator geometries

Correlation between symmetry classification and scattering spectra

Method reduces reliance on time-consuming numerical simulations

Abstract

Acoustics recently became a versatile platform for discovering novel physical effects and concepts at a relatively simple technological level. On this way, single resonators and the structure of their resonant modes play a central role and define the properties of complex acoustic systems such as acoustic metamaterials, phononic crystals, and topological structures. In this paper, we present a powerful method allowing a qualitative analysis of eigenmodes of resonators in the linear monochromatic acoustic domain based on multipole classification of eigenmodes. Using the apparatus of group theory, we explain and predict the structure of the scattered field knowing only the symmetry group of the resonator by connecting the multipolar content of incident and scattered fields. Such an approach can be utilized for developing resonators with predesigned properties avoiding time-consuming simulations. We have performed full multipole symmetry classification for a number of resonators geometries, and tightened it with scattering spectra profiles.