# Stealth acoustic materials

## TL;DR

This paper presents the design and experimental validation of a 1D stealth acoustic material that suppresses scattering over a broad frequency range, enabling broadband acoustic transparency with potential applications in wave physics.

## Contribution

The paper introduces a novel 1D stealth acoustic material design using scatterer placement to achieve broadband transparency, validated through experiments.

## Key findings

- Experimental results match theoretical predictions.
- The material maintains transparency despite losses and finite size.
- Potential for practical applications in wave physics.

## Abstract

We report the experimental design of a 1D stealth acoustic material, namely a material that suppresses the acoustic scattering for a given set of incident wave vectors. The material consists of multiple scatterers, rigid diaphragms, located in an air-filled acoustic waveguide. The position of the scatterers has been chosen such that in the Born approximation a suppression of the scattering for a broad range of frequencies is achieved and thus a broadband transparency. Experimental results are found in excellent agreement with the theory despite the presence of losses and the finite size of the material, features that are not captured in the theory. This robustness as well as the generality of the results motivates realistic potential applications for the design of transparent materials in acoustics and other fields of wave physics.