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Momentum paradox in a vortex core

Zambrini, R and Thomson, L C and Barnett, S M and Padgett, M (2005) Momentum paradox in a vortex core. Journal of Modern Optics, 52 (8). pp. 1135-1144. ISSN 0950-0340

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Abstract

The identification of angular momentum l (h) over bar 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.

Item type: Article
ID code: 31082
Keywords: orbital angular-momentum, gaussian layer modes, electromagnetic fields, scalar representation, poynting vector, light, density, Optics. Light, Atomic and Molecular Physics, and Optics
Subjects: Science > Physics > Optics. Light
Department: Faculty of Science > Physics
Related URLs:
    Depositing user: Pure Administrator
    Date Deposited: 22 Jun 2011 16:19
    Last modified: 05 Sep 2014 08:54
    URI: http://strathprints.strath.ac.uk/id/eprint/31082

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