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Optical helicity, optical spin and related quantities in electromagnetic theory

Cameron, Robert and Barnett, Stephen and Yao, Alison (2012) Optical helicity, optical spin and related quantities in electromagnetic theory. New Journal of Physics, 14 (5). ISSN 1367-2630

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Abstract

We examine the optical helicity, the optical spin and the ij-infra- zilches in electromagnetic theory and show that these conserved quantities can be combined to form a new description of the angular momentum associated with optical polarization: one that is analogous to the familiar description of optical energy and linear momentum. The symmetries of Maxwell’s equations that underlie the conservation of our quantities are presented and discussed. We explain that a similar but distinct set of quantities, Lipkin’s zilches, describe the ‘angular momentum’ of the curl of the electromagnetic field, rather than the angular momentum of the electromagnetic field itself.

Item type: Article
ID code: 39955
Keywords: electromagnetic theory , optics, optical helicity , optical spin, Optics. Light, Physics and Astronomy(all)
Subjects: Science > Physics > Optics. Light
Department: Faculty of Science > Physics
Depositing user: Pure Administrator
Date Deposited: 06 Jun 2012 15:03
Last modified: 04 Sep 2015 04:12
URI: http://strathprints.strath.ac.uk/id/eprint/39955

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