The world’s first 3D acoustic cloak, which reroutes sound waves so that both the cloak and the object beneath it do not appear to be present, has been designed by engineers.
A team led by Steven Cummer, from Duke University, constructed a pyramid-like structure using several plastic plates with a repeating pattern of holes stacked one on top of the other. The cloak alters the trajectory of sound waves to match what they would look like if reflected off a flat surface.
The cloak works in all three dimensions, irrespective of the location of the spectator or which direction the sound is coming from.
The technology could be applicable to sonar avoidance and architectural acoustics in the future.Read more at Duke University