Browse Physics

A proposed structure blocks sound waves in one direction but lets them pass in the other direction by first doubling their frequency.

Bent light can do more than render objects invisible—it can make them appear as something else.

Materials with unusual optical properties may allow the construction of sensors surrounded by a cloaking shell that makes the detectors undetectable.

A compact lens made from an acoustic metamaterial can focus ultrasonic waves to half a wavelength.

Researchers challenge the idea that special materials can bend light the ‘wrong’ way and create the perfect lens.