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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 37, Iss. 22 — Nov. 15, 2012
  • pp: 4627–4629

Visualizing orbital angular momentum of plasmonic vortices

Z. Shen, Z. J. Hu, G. H. Yuan, C. J. Min, H. Fang, and X.-C. Yuan  »View Author Affiliations

Optics Letters, Vol. 37, Issue 22, pp. 4627-4629 (2012)

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Plasmonic vortices (PVs) are generated by focusing a radially polarized optical vortex (OV) beam onto a metal surface. The intensity distribution of the PV is registered with a near-field scanning optical microscopy and agrees well with a theoretical prediction as well as numerical calculation. Beside the dark central spot, the numerical calculation also shows an azimuthal Poynting vector belonging to the PV, implying that the orbital angular momentum (OAM) was transferred from the radially polarized OV. To directly verify the OAM, plasmonic trapping experiments with gold micrometer particles are performed and the particle rotation is visualized. Further experiments by varying the topological charge of radially polarized OVs show the corresponding changes in rotation in terms of speed and radius.

© 2012 Optical Society of America

OCIS Codes
(240.6680) Optics at surfaces : Surface plasmons
(180.4243) Microscopy : Near-field microscopy
(050.4865) Diffraction and gratings : Optical vortices

ToC Category:

Original Manuscript: July 9, 2012
Revised Manuscript: September 24, 2012
Manuscript Accepted: September 28, 2012
Published: November 7, 2012

Z. Shen, Z. J. Hu, G. H. Yuan, C. J. Min, H. Fang, and X.-C. Yuan, "Visualizing orbital angular momentum of plasmonic vortices," Opt. Lett. 37, 4627-4629 (2012)

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Supplementary Material

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» Media 2: MOV (7768 KB)     

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