Time-modulated active control and wavefront shaping strategies for the control of acoustic waves and objects

Wavefront shaping and active control techniques have been at the forefront of various research fields in recent years, enabling the realization of phenomena beyond the limits of passive systems. In this seminar, I will present two examples of recent works carried out at the Laboratory of Wave Engineering (EPFL) exploring these advanced control strategies.

First, I will discuss the non-reciprocal control of acoustic waves through active modulation of resonators with time-periodic impedance variations. A key focus will be the experimental realization of an acoustic circulator based on this time-varying control approach compared to a purely mechanical one.

Second, I will introduce an iterative and versatile method for manipulating objects in disordered environments using acoustic waves. This technique, based on far-field wavefront shaping, leverages wave-momentum control to steer objects with precision. I will briefly outline the theoretical foundation of this approach and present experimental results demonstrating various manipulation scenarios.