Two physicists in China have shown that it should be possible to observe negative refraction with sound waves. Xiangdong Zhang of Beijing Normal University and Zhengyou Liu of Wuhan University have ...

Physicists have generated a lot of excitement in recent years by dreaming up specially structured materials with novel applications like invisibility cloaks. What’s more, some of these “metamaterials” ...

Acoustics is the branch of science that studies the propagation of sound and vibrational waves. Audible acoustic waves are ubiquitous in our everyday experience: they form the basis of verbal human ...

So far we have only considered sound in isolation and we have seen that sound has velocity, frequency, wavelength and reduces in intensity in proportion to the square of the distance from the source.

Whether you live in a town, city, or countryside, noise is everywhere. Urban planners and civil engineers have been taking noise into account, and, modern apartments often have pretty good sound ...

Scientists have demonstrated that negative refraction can be achieved using atomic arrays -- without the need for artificially manufactured metamaterials. Scientists have long sought to control light ...

Materials that bend sound waves backwards could be used to make perfect sound proofing and sharper medical scans, say UK-based researchers. In the past few years, scientists have learned how to create ...

Researchers have used 3D printing to develop acoustic metamaterials that can be tuned to different frequencies—something that is a rare quality in these types of structures and opens the door to new ...

We show that by coiling up space using curled perforations, a two-dimensional acoustic metamaterial can be constructed to give a frequency dispersive spectrum of extreme constitutive parameters, ...