Bending sound for a sharper scan

时间:2019-03-03 07:15:04166网络整理admin

By Justin Mullins ULTRASOUND scans could soon be much more detailed, thanks to a novel material that can bend sound waves the “wrong” way. This property, known as negative refraction, means the material should bring sound waves to a focus far sharper than today’s medical scanners. Negative refraction of light was predicted in the 1970s by the Russian physicist Victor Veselago, but it wasn’t actually achieved until 2000. Then in 2001, John Pendry, a theoretical physicist at Imperial College London,