Amplification of electromagnetic fields by a rotating body
Amplification of electromagnetic fields by a rotating body
In 1971, Zel’dovich predicted the amplification of electromagnetic (EM) waves scattered by a rotating metallic cylinder, gaining mechanical rotational energy from the body. This phenomenon was believed to be unobservable with electromagnetic fields due to technological difficulties in meeting the condition of amplification that is, the cylinder must rotate faster than the frequency of the incoming radiation. Here, we measure the amplification of an electromagnetic field, generated by a toroid LC-circuit, scattered by an aluminium cylinder spinning in the toroid gap. We show that when the Zel’dovich condition is met, the resistance induced by the cylinder becomes negative implying amplification of the incoming EM fields. These results reveal the connection between the concept of induction generators and the physics of this fundamental physics effect and open new prospects towards testing the Zel’dovich mechanism in the quantum regime, as well as related quantum friction effects.
Braidotti, M.C.
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Vinante, A.
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Cromb, M.
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Sandakumar, A.
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Faccio, D.
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Ulbricht, H.
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27 June 2024
Braidotti, M.C.
6b3ddc8d-7584-423b-ad71-4a9f6712a440
Vinante, A.
c05416dc-57b9-47cc-a14b-d57e8b4a8bd6
Cromb, M.
55df29bb-0f14-43a4-8507-68850b236bda
Sandakumar, A.
db493cbb-097d-4a54-a142-d81f0ceaa893
Faccio, D.
d1faac9d-7c36-41d8-98ea-7750ff87026e
Ulbricht, H.
5060dd43-2dc1-47f8-9339-c1a26719527d
Braidotti, M.C., Vinante, A., Cromb, M., Sandakumar, A., Faccio, D. and Ulbricht, H.
(2024)
Amplification of electromagnetic fields by a rotating body.
Nature Communications, 15, [5453].
(doi:10.1038/s41467-024-49689-w).
Abstract
In 1971, Zel’dovich predicted the amplification of electromagnetic (EM) waves scattered by a rotating metallic cylinder, gaining mechanical rotational energy from the body. This phenomenon was believed to be unobservable with electromagnetic fields due to technological difficulties in meeting the condition of amplification that is, the cylinder must rotate faster than the frequency of the incoming radiation. Here, we measure the amplification of an electromagnetic field, generated by a toroid LC-circuit, scattered by an aluminium cylinder spinning in the toroid gap. We show that when the Zel’dovich condition is met, the resistance induced by the cylinder becomes negative implying amplification of the incoming EM fields. These results reveal the connection between the concept of induction generators and the physics of this fundamental physics effect and open new prospects towards testing the Zel’dovich mechanism in the quantum regime, as well as related quantum friction effects.
Text
s41467-024-49689-w
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Accepted/In Press date: 11 June 2024
Published date: 27 June 2024
Identifiers
Local EPrints ID: 497739
URI: http://eprints.soton.ac.uk/id/eprint/497739
ISSN: 2041-1723
PURE UUID: 520de9e6-bf2d-4e81-bc14-0ea9c5932dab
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Date deposited: 30 Jan 2025 17:46
Last modified: 22 Aug 2025 01:59
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Contributors
Author:
M.C. Braidotti
Author:
A. Vinante
Author:
M. Cromb
Author:
A. Sandakumar
Author:
D. Faccio
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