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Proceedings Paper

Angular diffraction
Author(s): S. Franke-Arnold; B. Jack; J. Leach; M. J. Padgett
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Paper Abstract

The angular profile and the orbital angular momentum of a light mode are related by Fourier transform. Any modification of the angular distribution, e. g. via diffraction off a suitably programmed spatial light modulator, influences the orbital angular momentum spectrum of the light. This holds true even at the single photon level. We observe the influence of various angular masks on the orbital angular momentum spectrum, both in the near and the far field, and describe the resulting patterns in terms of angular diffraction. If photons are entangled in their orbital angular momentum, diffraction of one photon affects the orbital angular momentum spectrum of its partner photon, and angular ghost diffraction can be measured in the coincidence counts. We highlight the role of the angular Fourier relationship for these effects.

Paper Details

Date Published: 6 February 2009
PDF: 10 pages
Proc. SPIE 7227, Complex Light and Optical Forces III, 72270I (6 February 2009); doi: 10.1117/12.813564
Show Author Affiliations
S. Franke-Arnold, Univ. of Glasgow (United Kingdom)
B. Jack, Univ. of Glasgow (United Kingdom)
J. Leach, Univ. of Glasgow (United Kingdom)
M. J. Padgett, Univ. of Glasgow (United Kingdom)

Published in SPIE Proceedings Vol. 7227:
Complex Light and Optical Forces III
Enrique J. Galvez; David L. Andrews; Jesper Glückstad, Editor(s)

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