Design Omnidirectional Wave Absorbers by Transformation Method

TL;DR

This paper introduces a transformation-based design method for omnidirectional broadband wave absorbers applicable to electromagnetic, acoustic, and elastic waves, enabling new material configurations and validated through numerical simulations.

Contribution

It presents a general conformal mapping approach to design omnidirectional wave absorbers for multiple wave types, including elastic waves, with proposed material realizations.

Findings

Design of electromagnetic and acoustic omnidirectional absorbers using transformation method.

Development of magnetic and mass-density-controlled absorbers for EM and acoustic waves.

Numerical validation of elastic wave absorber design.

Abstract

A general conformal mapping is proposed to design omnidirectional broadband wave absorbers by transformation method. When applied to electromagnetic (EM) and acoustic waves, the existing material parameters of the EM and acoustic omnidirectional absorbers, which are previously obtained by Hamiltonian optics and geometry acoustics, can be recovered. In addition, magnetic and mass-density-controlled omnidirectional absorbers for EM and acoustic waves can also be designed, respectively. We then apply the conformal mapping to design an omnidirectional elastic wave absorber, the corresponding material realization of such elastic absorber is also proposed and validated by numerical simulation.