Mechanism of angular momentum transfer from microwaves to a copper ring

Autor: Janine Emile, Bo Thidé, Kouroch Mahdjoubi, W. L. Wei, Olivier Emile, Christian Brousseau, Ronan Niemiec
Přispěvatelé: URU 435 Laboratoire de physique des lasers (URU 435 LPL), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES), Institut d'Électronique et des Technologies du numéRique (IETR), Nantes Université (NU)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), Institut de Physique de Rennes (IPR), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Centre National de la Recherche Scientifique (CNRS), Swedish Institute of Space Physics [Uppsala] (IRF), Université de Rennes (UR), Université de Nantes (UN)-Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), Université de Rennes (UR)-Centre National de la Recherche Scientifique (CNRS), Université de Nantes (UN)-Université de Rennes 1 (UR1)
Rok vydání: 2016
Předmět:
Zdroj: The European Physical Journal D : Atomic, molecular, optical and plasma physics
The European Physical Journal D : Atomic, molecular, optical and plasma physics, EDP Sciences, 2016, 70 (172), ⟨10.1140/epjd/e2016-70193-6⟩
The European Physical Journal D : Atomic, molecular, optical and plasma physics, 2016, 70 (172), ⟨10.1140/epjd/e2016-70193-6⟩
ISSN: 1434-6079
1434-6060
DOI: 10.1140/epjd/e2016-70193-6
Popis: International audience; In the exchange of orbital angular momentum between an electromagnetic wave and a copper ring we examine the origin of the Angular Momentum. We then investigate the transfer mechanism between the microwave and the object, and compare it with other mechanisms. We evidence a transfer mechanism based on the reflection of the electromagnetic field on the copper ring. In particular, at a microscopic scale, we show that the electromagnetic field induces alternative electric currents in the ring, with a small drift. Although little, the resistivity of copper leads to a force that rotates the ring. The estimation of the torque, which is of the order of 10 −8 Nm, is in good agreement with the experimental measurements. We also show that the transfer of electromagnetic orbital angular momentum to objects could be a way to measure the orbital angular momentum carried by electromagnetic fields, and we discuss possible applications. PACS. 41.20.Jb Electromagnetic wave propagation; radiowave propagation – 45.20.da Forces and torques – 84.40.Ba Antennas: theory, components and accessories – 42.50.Tx Optical angular momentum and its quantum aspects
Databáze: OpenAIRE
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