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Screw-shaped light in extended electromagnetics
KTH, School of Electrical Engineering (EES), Centres, Alfvén Laboratory Centre for Space and Fusion Plasma Physics. KTH, School of Electrical Engineering (EES), Fusion Plasma Physics.
2005 (English)In: Physica Scripta, ISSN 0031-8949, E-ISSN 1402-4896, Vol. 72, no 5, 359-365 p.Article in journal (Refereed) Published
Abstract [en]

Twisted light beams have recently been observed for which the energy travels ill a corkscrew-shaped path. spiralling around the beam's central axis. These discoveries arc expected to become important to the development of new methods in the field of communication. as well as to the invention of new tools in microbiology. In this paper is shown that conventional theory based oil Maxwell's equations cannot explain the basic features of twisted light. On the other hand an extended electromagnetic theory, based oil a nonzero electric field divergence in the vacuum state. appears to be reconcilable with the main behaviour of the twisted light phenomena. The solutions and the set of modes being obtained from this extended theory are applicable both to models of high and low density photon beams and to those of individual photons. all having limited extensions in space and possessing an angular momentum (spin). Thereby beam models call be developed the intensity of which forms a ring-shaped cross-section, and individual photon models call be obtained which have the features of "needle radiation". However. within the limits of validity of the approximations made so far in the analysis. it is not clear whether the effective diameter of the individual photon models call he small enough to approach atomic dimensions.

Place, publisher, year, edition, pages
2005. Vol. 72, no 5, 359-365 p.
Keyword [en]
Electric fields, Electromagnetic waves, Maxwell equations, Photons, Electromagnetics, Spiralling, Twisted light beams
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-37812DOI: 10.1238/Physica.Regular.072a00359ISI: 000233602200005ScopusID: 2-s2.0-27944461369OAI: diva2:435311
QC 20110818Available from: 2011-08-18 Created: 2011-08-17 Last updated: 2011-08-18Bibliographically approved

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Lehnert, Bo
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