In the beam of light emitted by a laser pointer, photons travel predominantly along one direction and the beam is therefore said to be collimated. The electric field carried by these photons is ...

Light can exert incredible forces. According to the rules of quantum mechanics, light is an electromagnetic wave, as well as a stream of photons. Since it has momentum, a transparent particle through ...

Underwater turbines that harvest tidal currents have already become an established technology in the world of clean energy. So in order to push the frontier further, a group of engineers at Oxford ...