Longitudinal fields of quantized Laguerre-Gaussian modes

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Longitudinal fields of quantized Laguerre-Gaussian modes are derived, revealing their importance even for light that may be considered to be propagating in the paraxial regime. This is in contrast to unstructured laser light, e.g. a Gaussian beam, where the magnitude of longitudinal components only become important under strong-focusing of the source. The unique effects stem specifically from the optical angular momentum, both orbital and spin, of optical vortex light, and include spin-orbit interactions in freely-propagating circularly-polarized vortices in free-space. The contribution that longitudinal fields make to the rate of single-photon absorption is calculated, highlighting that for optical vortices they cannot be neglected in general.

Original languageEnglish
Title of host publicationComplex Light and Optical Forces XV
EditorsEnrique J. Galvez, Halina Rubinsztein-Dunlop, David L. Andrews
ISBN (Electronic)9781510642379
Publication statusPublished - 5 Mar 2021

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


  • Non-paraxial optics
  • light-matter interactions
  • optical orbital angular momentum
  • optical vortex
  • spin-orbit interactions of light
  • twisted light

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