World's first 3-D acoustic cloak hides objects from sound

US researchers have demonstrated the  world's first three-dimensional acoustic cloak which reroutes sound waves to create the impression that the cloak and anything beneath it are not there.

 The acoustic cloaking device works in all three dimensions, no matter which direction the sound is coming from or where the observer is located, and holds potential for future applications such as sonar avoidance and architectural acoustics, researchers said.

"The particular trick we're performing is hiding an object from sound waves," said Steven Cummer, professor of electrical and computer engineering at Duke University.