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Momentum paradox in a vortex core

AuthorsZambrini, Roberta ; Thomson, Laura C.; Barnett, Stephen M.; Padgett, Miles
KeywordsOrbital beams
Angular momentum
Optical vortex
Bessel beams
Field evanescent components
Issue Date20-May-2005
PublisherTaylor & Francis
CitationJournal of Modern Optics 52(8): 1135-1144 (2005)
AbstractThe identification of angular momentum lh per photon with optical vortices of charge l appears to require that the field amplitude be zero within a finite distance of the vortex. This, however, is not compatible with the known form of beams such as the Laguerre Gaussian and Bessel beams. We resolve this paradox by analysing the propagation of a Bessel beam through a small circular aperture, showing that the resulting field has evanescent components.
Description10 pages, 5 figures.
Publisher version (URL)http://dx.doi.org/10.1080/09500340412331326383
Appears in Collections:(IFISC) Artículos
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