The green laser beam travelled from a radio tower to the roof of the scientists’ own building

Physicists have sent a beam of twisted light 3km through the air above Vienna.

It is the first time that information has been transmitted outdoors using the “twist” of a visible light beam.

This twisting property could allow very fast communication because light with different amounts of twist, encoding separate channels of information, could be sent simultaneously.

Reported in the New Journal of Physics, the technique was tested by sending three images of famous Austrians.

The images were black-and-white portraits of the physicists Ludwig Boltzmann and Erwin Schroedinger, and composer Wolfgang Amadeus Mozart.

Above the rooftops of Mozart’s own city, where the only long-range signal known to the famous composer would have been church bells, his portrait was broken down into pixels and travelled through the night inside a green laser beam.

Source: BBCNews Read more

Advertisements