UK team sounds off with metamaterial bricks

Metamaterials have long been employed in the manipulation of light, where spatial light modulators (SLMs) alter the amplitude and phase of beams. Until now, the acoustic equivalent of an SLM has not existed. The new study, published in the journal Nature Communications, shows that similar levels of acoustic control are possible.

The team created a layer of metamaterials using 16 varieties of small 3D printed bricks that each manipulate sound in a different way. Depending on how the layer of bricks is configured, incoming sound waves can be transformed into an acoustic field of any shape.

“Our metamaterial bricks can be 3D printed and then assembled together to form any sound field you can imagine,” said project lead Dr Gianluca Memoli, from Sussex University’s Interact Lab.

“We also showed how this can be achieved with only a small number of different bricks. You can think of a box of our metamaterial bricks as a do-it-yourself acoustics kit.”