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Electromagnetically Induced Torque on a Large Ring in the Microwave Range
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2014 (English)In: Physical Review Letters, ISSN 0031-9007, Vol. 112, no 5, 053902- p.Article in journal (Refereed) Published
Abstract [en]

We report on the exchange of orbital angular momentum between an electromagnetic wave and a 30 cm diameter ring. Using a turnstile antenna in the GHz range, we induce a torque on a suspended copper strip of the order of 10(-8) N m. Rotations of a few degrees and accelerations up to 4 x 10(-4) degrees/s(2) are observed. A linear dependence of the acceleration as a function of the applied power is found. There are many applications in the detection of angular momentum in electromagnetics, in acoustics, and also in the magnetization of nanostructures.

Place, publisher, year, edition, pages
2014. Vol. 112, no 5, 053902- p.
National Category
Natural Sciences
URN: urn:nbn:se:uu:diva-220990DOI: 10.1103/PhysRevLett.112.053902ISI: 000331949700008OAI: oai:DiVA.org:uu-220990DiVA: diva2:707677
Available from: 2014-03-25 Created: 2014-03-24 Last updated: 2014-03-25Bibliographically approved

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Thidé, Bo
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Swedish Institute of Space Physics, Uppsala Division
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