Momentum paradox in a vortex core

R Zambrini, L C Thomson, S M Barnett, M Padgett

Research output: Contribution to journalArticle

11 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)1135-1144
Number of pages10
JournalJournal of Modern Optics
Volume52
Issue number8
DOIs
Publication statusPublished - 20 May 2005

Keywords

  • orbital angular-momentum
  • gaussian layer modes
  • electromagnetic fields
  • scalar representation
  • poynting vector
  • light
  • density

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    Zambrini, R., Thomson, L. C., Barnett, S. M., & Padgett, M. (2005). Momentum paradox in a vortex core. Journal of Modern Optics, 52(8), 1135-1144. https://doi.org/10.1080/09500340412331326383