2011/07/15 by Fabrizio Tamburini, Elettra Mari, Anna Sponselli +5 · 8 citations
Materials Science · Physics and Astronomy · #Metamaterials and Metasurfaces Applications #Orbital Angular Momentum in Optics #Radio Astronomy Observations and Technology #astro-ph.IM #physics.class-ph #physics.ins-det
paper · pdf · doi:10.1088/1367-2630/14/3/033001
17 pages, 6 figures, with a public experiment, three audio files in mp3 format
arxiv created 2011/07/15 · openalex publication_date 2012/03/01 · arxiv updated 2015/05/28 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/30
We have shown experimentally that it is possible to propagate and use the properties of twisted non-monochromatic incoherent radio waves to simultaneously transmit to infinity more radio channels on the same frequency band by encoding them in different orbital angular momentum states. This novel radio technique allows the implementation of, at least in principle, an infinite number of channels on one and the same frequency, even without using polarization or dense coding techniques. An optimal combination of all these physical properties and techniques represents a solution for the problem of radio band congestion. Our experimental findings show that the vorticity of each twisted electromagnetic wave is preserved after the propagation, paving the way for entirely new paradigms in radio communication protocols.