Utilization of photon orbital angular momentum in the low-frequency radio domain

Utilization of photon orbital angular momentum in the low-frequency radio domain

2 May 2009 | B. Thidé, H. Then, J. Sjöholm, K. Palmer, J. Bergman, T. D. Carozzi, Ya. N. Istomin, N. H. Ibragimov, R. Khamitova
The paper discusses the utilization of photon orbital angular momentum (OAM) in low-frequency radio beams, demonstrating that vector antenna arrays can generate radio beams with spin and orbital angular momentum characteristics similar to those of helical Laguerre-Gauss laser beams in paraxial optics. For frequencies up to 1 GHz, digital techniques can coherently measure and manipulate the instantaneous, local field vectors, enabling new types of experiments and information-rich radio astronomy. The authors propose using antenna arrays to generate and detect both spin and OAM in radio beams, showing that this approach can produce radiation patterns similar to those obtained in paraxial optics. They also explore the superposition of different OAM states and the potential for resolving OAM through discrete Fourier transform. The paper highlights the applications of radio OAM in detecting ultrahigh-energy neutrinos, studying radio wave interactions with the atmosphere and ionosphere, and radar probing of the Sun. Additionally, the authors discuss the possibility of using radio OAM for novel information-rich radar and wireless communication concepts, as well as the potential for clues about magnetic monopoles. The LOIS Test Station in southern Sweden has already implemented these techniques for proof-of-concept experiments.The paper discusses the utilization of photon orbital angular momentum (OAM) in low-frequency radio beams, demonstrating that vector antenna arrays can generate radio beams with spin and orbital angular momentum characteristics similar to those of helical Laguerre-Gauss laser beams in paraxial optics. For frequencies up to 1 GHz, digital techniques can coherently measure and manipulate the instantaneous, local field vectors, enabling new types of experiments and information-rich radio astronomy. The authors propose using antenna arrays to generate and detect both spin and OAM in radio beams, showing that this approach can produce radiation patterns similar to those obtained in paraxial optics. They also explore the superposition of different OAM states and the potential for resolving OAM through discrete Fourier transform. The paper highlights the applications of radio OAM in detecting ultrahigh-energy neutrinos, studying radio wave interactions with the atmosphere and ionosphere, and radar probing of the Sun. Additionally, the authors discuss the possibility of using radio OAM for novel information-rich radar and wireless communication concepts, as well as the potential for clues about magnetic monopoles. The LOIS Test Station in southern Sweden has already implemented these techniques for proof-of-concept experiments.
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