Near-field electromagnetic trapping through curl-spin forces

Iñigo Liberal, Iñigo Ederra, Ramón Gonzalo, Richard W. Ziolkowski

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


Near-field electromagnetic trapping of particles is generally obtained by means of gradient forces. In this paper, we discuss the attractive behavior of curl-spin forces, as well as their potential for near-field electromagnetic trapping and manipulation. It is demonstrated that curl-spin forces enable the trapping of particles operating at their resonant frequency. Such phenomena can be exploited to design more efficient and selective electromagnetic traps, to boost near-field energy exchange systems, and to bring stability to coupled resonant radiators. It also is illustrated how the balance between the gradient, radiation pressure, and curl-spin force components leads to the formation of zero-force rings around their sources, which explicitly demarcate the trapping regions. Analytical and numerical analyses are presented to assess the stability of the trapping mechanism.

Original languageEnglish (US)
Article number063807
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Issue number6
StatePublished - Jun 5 2013

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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