Using little more than a few perforated sheets of plastic and a staggering amount of number crunching, Duke engineers have demonstrated the world's first three-dimensional acoustic cloak. The new device reroutes sound waves to create the impression that both 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.
The study appears online in Nature Materials.
"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. "By placing this cloak around an object, the sound waves behave like there is nothing more than a flat surface in their path."
Read more at: http://phys.org/news/2014-03-world-d-acoustic-cloaking-device.html#jCp