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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 22 — Oct. 26, 2009
  • pp: 20567–20574

Coherent transfer of orbital angular momentum to excitons by optical four-wave mixing

Y. Ueno, Y. Toda, S. Adachi, R. Morita, and T. Tawara  »View Author Affiliations


Optics Express, Vol. 17, Issue 22, pp. 20567-20574 (2009)
http://dx.doi.org/10.1364/OE.17.020567


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Abstract

We demonstrate the coherent transfer of optical orbital angular momentum (OAM) to the center of mass momentum of excitons in semiconductor GaN using a four-wave mixing (FWM) process. When we apply the optical vortex (OV) as an excitation pulse, the diffracted FWM signal exhibits phase singularities that satisfy the OAM conservation law, which remain clear within the exciton dephasing time (~1ps). We also demonstrate the arbitrary control of the topological charge in the output signal by changing the OAM of the input pulse. The results provide a way of controlling the optical OAM through carriers in solids. Moreover, the time evolution of the FWM with OAM leads to the study of the closed-loop carrier coherence in materials.

© 2009 Optical Society of America

OCIS Codes
(060.4510) Fiber optics and optical communications : Optical communications
(300.6240) Spectroscopy : Spectroscopy, coherent transient
(300.6290) Spectroscopy : Spectroscopy, four-wave mixing
(050.4865) Diffraction and gratings : Optical vortices

ToC Category:
Physical Optics

History
Original Manuscript: July 27, 2009
Revised Manuscript: September 11, 2009
Manuscript Accepted: September 12, 2009
Published: October 23, 2009

Citation
Y. Ueno, Y. Toda, S. Adachi, R. Morita, and T. Tawara, "Coherent transfer of orbital angular momentum to excitons by optical four-wave mixing," Opt. Express 17, 20567-20574 (2009)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-17-22-20567


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