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Most of us have been violently awakened in the middle of the night by a noisy neighbor. Very soon, however, this may not happen again to us with a new Acoustic invisibility cloak. This is a new material, according to scientists at the Polytechnic University of Valencia, Spain, you can make objects "impervious" to the sound waves. And he could build houses, concert halls, or even warships to sound check, says the study published in New Journal of Physics (New Journal of Physics).

know that sound, like light, is transmitted by waves. And the solid disrupt its passage. Past studies proposed that the call is possible acoustic invisibility surrounding an object with a "blanket." Thus, sound waves, to reach the object, instead of scattering are capable of making that object as if they were "invisible." "The problem is that there are these properties so exotic materials to create the invisibility cloak," he told BBC Science Professor José Sánchez-Dehesa, who led the study. "But our study suggests how to obtain these materials with exotic properties."

Scientists believe that the key to making these materials are called sonic crystals. These artificial compounds, also called metamaterials can be engineered to produce specific acoustical effects. The metamaterial could be used to improve the sound in concert halls.

The idea of \u200b\u200bacoustic cloak is diverting sound waves around an object. Unlike ordinary materials, the acoustic properties of sonic crystals are determined by their internal structure. And they are solid structures that can be made of lead, copper and polymers.

"The material consists of small sound scattering center, and although they are solid materials, basically behave like a fluid," said Professor Sánchez-Dehesa. "For example, if you want to hide acoustically cylindrical shaped object, we saw around that object to other cylinders made of metamaterials, the sound may be diverted around the object and we want to hide, "said the researcher. It is a similar effect, he says, the water flowing around a rock in a stream.

Simulations conducted researchers showed that 200 layers of this metamaterial could in fact make an object "impervious to noise. And the thick, explained the scientist depends on the wavelength you want to project. For example, the professor said Sánchez-Dehesa, could be used to make walls for the construction of safe houses noise. Or it could be used in concert halls to enhance acoustics or direct the sound away or around certain areas.