Lighthouses have guided mariners safely home for centuries, with the first lighthouse reportedly constructed in ancient Egypt (although it was later destroyed). Although GPS is now in everything from ...

One-way system: researchers find new way to stop light from propagating in the wrong direction. (Courtesy: Shutterstock/Shibiko) An optical device that uses mechanical rotation to allow light to ...

It has been known for centuries that light exhibits wave-like behaviour in certain situations. Some materials are able to rotate the polarisation, i.e. the direction of oscillation, of the light wave ...