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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 12, Iss. 22 — Nov. 1, 2004
  • pp: 5448–5456

Free-space information transfer using light beams carrying orbital angular momentum

Graham Gibson, Johannes Courtial, Miles J. Padgett, Mikhail Vasnetsov, Valeriy Pas’ko, Stephen M. Barnett, and Sonja Franke-Arnold  »View Author Affiliations

Optics Express, Vol. 12, Issue 22, pp. 5448-5456 (2004)

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We demonstrate the transfer of information encoded as orbital angular momentum (OAM) states of a light beam. The transmitter and receiver units are based on spatial light modulators, which prepare or measure a laser beam in one of eight pure OAM states. We show that the information encoded in this way is resistant to eavesdropping in the sense that any attempt to sample the beam away from its axis will be subject to an angular restriction and a lateral offset, both of which result in inherent uncertainty in the measurement. This gives an experimental insight into the effects of aperturing and misalignment of the beam on the OAMmeasurement and demonstrates the uncertainty relationship for OAM.

© 2004 Optical Society of America

OCIS Codes
(010.3310) Atmospheric and oceanic optics : Laser beam transmission
(060.4510) Fiber optics and optical communications : Optical communications
(090.1970) Holography : Diffractive optics

ToC Category:
Research Papers

Original Manuscript: September 23, 2004
Revised Manuscript: October 21, 2004
Published: November 1, 2004

Graham Gibson, Johannes Courtial, Miles Padgett, Mikhail Vasnetsov, Valeriy Pas'ko, Stephen Barnett, and Sonja Franke-Arnold, "Free-space information transfer using light beams carrying orbital angular momentum," Opt. Express 12, 5448-5456 (2004)

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