Metamaterial Device Controls Transmission and Reflection of Acoustic Waves

A thin material was developed that can control the redirection and reflection of sound waves with almost perfect efficiency. While many theoretical approaches to engineer such a device have been proposed, they have struggled to simultaneously control both the transmission and reflection of sound in exactly the desired manner, and none have been experimentally demonstrated. The new design is the first to demonstrate complete, near-perfect control of sound waves, and is quickly and easily fabricated using 3D printers.