Measurement of the rotational frequency shift imparted to a rotating light beam possessing orbital angular momentum

  • Courtial J
  • Dholakia K
  • Robertson D
 et al. 
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Abstract

We observe the frequency shift, l Omega, imparted to a mm-wave beam with an orbital angular momentum of l (h) over bar per photon, when the beam,is rotated at angular frequency Omega. We show that this shift, and those found in a number of experiments on the rotation of circularly polarized beams, are special cases of the rotational frequency shift recently predicted by Bialynicki-Birula and Bialynicka-Birula. The measurement also explicitly confirms a theoretical prediction by Nienhuis.

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Authors

  • J. Courtial

  • K. Dholakia

  • D. A. Robertson

  • L. Allen

  • M. J. Padgett

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