OAM Radio – Physical Foundations and Applications of Electromagnetic Orbital Angular Momentum in Radio Science and Technology

Thidé, Bo; Tamburini, Fabrizio

doi:10.1002/9781119662945.ch2

Cited by 4 publications

(3 citation statements)

References 200 publications

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“…Of particular interest are the enhanced capabilities of OAM beams to transmit information encoded in orthogonal angular-momentum eigenstates [7,8]. OAM radio has the potential to improve the bandwidth of radio communications [9].…”

Section: Introductionmentioning

confidence: 99%

Topology and Polarization of Optical Vortex Fields from Atomic Phased Arrays

Wang

Afanasev

2023

Applied Sciences

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We developed a theoretical formalism for the generation of optical vortices by phased arrays of atoms. Using the Jacobi–Anger expansion, we demonstrated the resulting field topology and determined the least number of individual atoms necessary for the generation of vortices with a given topological charge. Vector vortices were considered, taking into account both the spin and orbital angular momenta of electromagnetic fields. It was found for the vortex field that, in the far field limit, the spatial variation in spin-density matrix parameters—orientation and alignment—is independent of the distance to the radiation source.

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Section: Introductionmentioning

confidence: 99%

Topology and Polarization of Optical Vortex Fields from Atomic Phased Arrays

Wang

Afanasev

2023

Applied Sciences

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“…These methods then provide an indirect measurement of vorticity by reconstruction of the velocity field. On the other hand, vortices can 15 be found in electromagnetic waves [7,8] especially via the Orbital Angular Momentum (OAM). One may then wonder whether fluid vortices could be probed using OAM.…”

Section: Introductionmentioning

confidence: 99%

Fluid vortex mapping using the rotational Doppler effect

Émile

2022

Applied Physics Letters

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The light from a twisted laser beam, scattered at an air/water interface, experiences a rotational Doppler shift. We use a superposition of two beams with different topological charges to measure the beat frequency of the scattered light by a Rankine type vortex at different positions from its center. We show that the angular velocity decreases with the distance in total agreement with a Rankine vortex model. Several extensions are then considered, including the detection of turbulences generated in the wake of airplanes.

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“…One of the most important properties of OAM modes is that they are physical states of the EM field that preserve their topological properties of phase and intensity during their propagation in free space and represent a viable solution for a stable multiplexing (MUX) realized with standard linear momentum-based techniques [32] and the physical properties of the OAM field [22,33,34]. The robustness of the OAM beams during their propagation is confirmed by the results of a recent work where the topological stability of radio vortices at 233GHz permitted to measure the rotation of the supermassive black hole in the galaxy M87, after having traveled a distance of 56 millions of light years in the outer space [19,35,36].…”

Section: Introductionmentioning

confidence: 99%

Stability tests in time of OAM multiplexing schemes in highly disturbed environments

Tamburini,

Thidé,

Weibel

et al. 2021

Preprint

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We report the results of tests of data transmission and signal stability in time of two different wide-band multiplexing (MUX) schemes, each in a point-to-point configuration, based on electromagnetic waves carrying Orbital Angular Momentum (OAM) in noisy real-world settings. Each radio link transmitted two high definition wide-band analog TV channels in the same frequency band with FM-carrier centered at 2.414 GHz and 27 MHz bandwidth, encoded with different OAM modes in the same polarization state, uninterruptedly for 5 months during the world exhibition "Globale-Digitale" at ZKM in Karlsruhe and in other 2 months time slots taken in the following 4 years, 24 hours per day. We show the practical feasibility of the use of stable OAM radio/TV links in the real world for a long time, paving the way for for secure and efficient communication schemes also under electromagnetic jamming conditions.

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OAM Radio – Physical Foundations and Applications of Electromagnetic Orbital Angular Momentum in Radio Science and Technology

Cited by 4 publications

References 200 publications

Topology and Polarization of Optical Vortex Fields from Atomic Phased Arrays

Topology and Polarization of Optical Vortex Fields from Atomic Phased Arrays

Fluid vortex mapping using the rotational Doppler effect

Stability tests in time of OAM multiplexing schemes in highly disturbed environments

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