Electromagnetically induced torque on a large ring in the microwave range

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 4×10(-4) °/s2 ar...

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Bibliographic Details
Published in:Physical review letters 2014-02, Vol.112 (5), p.053902-053902, Article 053902
Main Authors: Emile, Olivier, Brousseau, Christian, Emile, Janine, Niemiec, Ronan, Madhjoubi, Kouroch, Thide, Bo
Format: Article
Language:English
Subjects:
Biochemistry, Molecular Biology
Biophysics
Life Sciences
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Summary: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 4×10(-4) °/s2 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.
ISSN:0031-9007
1079-7114
1079-7114
DOI:10.1103/PhysRevLett.112.053902