Bo Thide of the Swedish Institute of Space Physics and a team of colleagues in Italy recently demonstrated the encoding of data using the orbital angular momentum of light, sending two beams made of different OAM states across a canal in Venice. Casanova would have been delighted.
Radio spectrum policy groups should be delighted too. The two beams were in fact incoherent radio waves, with the same frequency, but with different OAM states. With the airwaves getting crowded, this could be the next big thing.