A team of researchers led by Prof. Andrea Alù has built the first-ever circulator for sound. The team’s experiments successfully prove that the fundamental symmetry with which acoustic waves travel through air between two points in space (“if you can hear, you can also be heard”) can be broken by a compact and simple device.
This area includes the study of wave propagation ranging from ultralow frequencies to microwaves. It involves investigations of electrical geophysics, antennas and scattering, radar target identification, wireless communications, microwave and millimeter-wave integrated circuits, and guided wave devices and systems. The activities in acoustics involve research in transducers, atmospheric and underwater acoustics, and noise and vibration control.