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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 6 — Mar. 24, 2014
  • pp: 6586–6596

Surface angular momentum of light beams

Marco Ornigotti and Andrea Aiello  »View Author Affiliations


Optics Express, Vol. 22, Issue 6, pp. 6586-6596 (2014)
http://dx.doi.org/10.1364/OE.22.006586


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Abstract

Traditionally, the angular momentum of light is calculated for “bullet-like” electromagnetic wave packets, although in actual optical experiments “pencil-like” beams of light are more commonly used. The fact that a wave packet is bounded transversely and longitudinally while a beam has, in principle, an infinite extent along the direction of propagation, renders incomplete the textbook calculation of the spin/orbital separation of the angular momentum of a light beam. In this work we demonstrate that a novel, extra surface part must be added in order to preserve the gauge invariance of the optical angular momentum per unit length. The impact of this extra term is quantified by means of two examples: a Laguerre-Gaussian and a Bessel beam, both circularly polarized.

© 2014 Optical Society of America

OCIS Codes
(260.0260) Physical optics : Physical optics
(260.2110) Physical optics : Electromagnetic optics
(260.6042) Physical optics : Singular optics

ToC Category:
Physical Optics

History
Original Manuscript: January 22, 2014
Revised Manuscript: March 4, 2014
Manuscript Accepted: March 4, 2014
Published: March 13, 2014

Citation
Marco Ornigotti and Andrea Aiello, "Surface angular momentum of light beams," Opt. Express 22, 6586-6596 (2014)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-22-6-6586


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