Realization of bi-directional analog computing using non-reciprocalacoustic metasurfaces

We present the realization of bi-directional analog computing using non-reciprocal acoustic metasurfaces. These are designed to enable direction-dependent mathematical operations. For instance, the metasurface allows distortion-free transmission of waves in one direction, while applying a spatial derivative to waves in the opposite direction. This functionality is particularly useful for acoustic imaging, enabling real-time edge extraction through the metasurface without digital post-processing. This approach is not only limited to acoustic imaging but can also be extended to a wide range of applications where real-time and directional wave control is essential.