An intuitive view of the origin of orbital angular momentum in optical vortices

Sheng Yanng Tseng*, Long Hsu

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

A modulated laser beam by a phase pattern exp(ilθ) can be focused by an objective into a ring-like optical vortex, where l is a constant and θ is the azimuth angle. The vortex is capable of trapping the particles nearby and circulating them along the ring. This phenomenon is often explained involving Fourier optics and the transfer of orbital angular momentum (OAM). Although Fourier optics transforms the electric field distribution of the modulated laser beam behind the phase pattern to that of the vortex, it does not include both the path and OAM of the photons of the electromagnetic wave. Therefore, it is difficult to further trace the transfer of OAM from the photons to the particles in the vortex. In this paper, we propose a simple and intuitive view to the origin of optical vortex. By analyzing the relationship of the intensity distributions between the phase of the phase pattern and the intensity of the vortex by utilizing Fourier transform, we propose that the phenomenon of vortex also involve the transfer of linear momentum on the vortex plane transversely.

Original languageEnglish
Title of host publicationOptical Trapping and Optical Micromanipulation III
DOIs
StatePublished - 1 Dec 2006
EventOptical Trapping and Optical Micromanipulation III - San Diego, CA, United States
Duration: 13 Aug 200617 Aug 2006

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume6326
ISSN (Print)0277-786X

Conference

ConferenceOptical Trapping and Optical Micromanipulation III
CountryUnited States
CitySan Diego, CA
Period13/08/0617/08/06

Keywords

  • Holographic optical tweezers
  • Optical vortex
  • Orbital angular momentum

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