# Broadband nonreciprocal acoustic propagation using programmable boundary conditions: from analytical modelling to experimental implementation

## TL;DR

This paper demonstrates a novel approach to achieve nonreciprocal acoustic wave propagation using programmable boundary conditions, combining theoretical, numerical, and experimental methods to validate the concept.

## Contribution

It introduces a new method for acoustic isolation in waveguides through programmable boundary conditions, supported by comprehensive modeling and experimental validation.

## Key findings

- Successful theoretical explanation of nonreciprocal propagation
- Numerical simulations confirm non-reciprocity and passivity
- Experimental results validate programmable boundary conditions for acoustic isolation

## Abstract

In this paper, we theoretically, numerically and experimentally demonstrate the acoustic isolator effect in a 1D waveguide with direction dependent controlled boundary conditions. A theoretical model is used to explain the principle of non reciprocal propagation in boundary controlled waveguides. Numerical simulations are carried out on a reduced model to show the non-reciprocity as well as the passivity of the system, through the computation of the scattering matrix and the power delivered by the system. Finally, an experimental implementation validate the potential of programmable boundary conditions for non reciprocal propagation.