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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 33, Iss. 7 — Apr. 1, 2008
  • pp: 696–698

Electro-optically forbidden or enhanced spin-to-orbital angular momentum conversion in a focused light beam

Lixiang Chen and Weilong She  »View Author Affiliations

Optics Letters, Vol. 33, Issue 7, pp. 696-698 (2008)

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We demonstrate that the conversion of spin-to-orbital angular momentum in a focused vectorial light beam can be forbidden or enhanced by the electric-field-erased or increased spatial anisotropy of a uniaxial crystal undergoing the Pockels effect. A focused right-handed circularly polarized quasi-Gaussian beam incident on an electro-optic crystal strontium barium niobate is taken to illustrate the effect, and a conversion-forbidden electric field E 0 = 16.87 kV cm is found. Of special interest is that single photons generated in this effect exhibit an entanglement of 2 deg of freedom of spin and orbital angular momentum, and it is electro-optically controllable.

© 2008 Optical Society of America

OCIS Codes
(160.2100) Materials : Electro-optical materials
(190.4360) Nonlinear optics : Nonlinear optics, devices
(260.2110) Physical optics : Electromagnetic optics
(270.5585) Quantum optics : Quantum information and processing

ToC Category:
Physical Optics

Original Manuscript: January 9, 2008
Revised Manuscript: February 13, 2008
Manuscript Accepted: February 14, 2008
Published: March 28, 2008

Lixiang Chen and Weilong She, "Electro-optically forbidden or enhanced spin-to-orbital angular momentum conversion in a focused light beam," Opt. Lett. 33, 696-698 (2008)

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