# Wave Chaos in a Cavity of Regular Geometry with Tunable Boundaries

## TL;DR

This paper introduces a novel experimental approach to wave chaos using a regular-shaped cavity with tunable boundaries enabled by a reconfigurable metasurface, broadening the study and application of wave chaos.

## Contribution

It demonstrates a new paradigm for wave chaos experiments with regular geometries and tunable boundaries, replacing complex cavity shapes.

## Key findings

- Reconfigurable metasurface effectively tunes boundary conditions.
- Regular geometry cavities can exhibit wave chaos.
- Experimental verification confirms theoretical predictions.

## Abstract

Wave chaotic systems underpin a wide range of research activities, from fundamental studies of quantum chaos via electromagnetic compatibility up to more recently emerging applications like microwave imaging for security screening, antenna characterisation or wave-based analog computation. To implement a wave chaotic system experimentally, traditionally cavities of elaborate geometries (bowtie shapes, truncated circles, parallelepipeds with hemispheres) are employed because the geometry dictates the wave field's characteristics. Here, we propose and experimentally verify a radically different paradigm: a cavity of regular geometry but with tunable boundary conditions, experimentally implemented by leveraging a reconfigurable metasurface. Our results set new foundations for the use and the study of chaos in wave physics.