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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 15 — Jul. 29, 2013
  • pp: 18442–18451

Tetrad phase vortex structure in scattered SPP field produced by silver nano-ring-slit under linearly polarized illumination

Xing Li, Guotao Liang, Zhenhua Li, Chunxiang Liu, and Chuanfu Cheng  »View Author Affiliations


Optics Express, Vol. 21, Issue 15, pp. 18442-18451 (2013)
http://dx.doi.org/10.1364/OE.21.018442


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Abstract

We report the tetrad phase vortex structure in the scattered surface plasmon polariton (SPP) field produced by a silver nano-ring-slit with linearly polarized illumination. In the experiment, Mach-Zehnder type interferometer is constructed in which a microscopic objective (MO) is used to collect and image the scattered SPP field, and the phase map is extracted by Fourier transform of the interference intensity. To explain the formation of the tetrad phase vortices in the central area of the ring, we propose an empirical model for the ring-slit-excited SPP source field by trial calculations with the Huygens-Fresnel principle for SPP propagations. It is shown that the azimuthal variation of the amplitude of the source SPP is roughly a half of a constant base, and the variation of the phase is a little greater than π/2. The intensity and the phase distributions of the SSP field calculated with the formulations of this model phenomenologically conform the experimental results.

© 2013 OSA

OCIS Codes
(240.6680) Optics at surfaces : Surface plasmons
(290.0290) Scattering : Scattering
(350.5030) Other areas of optics : Phase
(050.4865) Diffraction and gratings : Optical vortices

ToC Category:
Optics at Surfaces

History
Original Manuscript: June 3, 2013
Revised Manuscript: July 14, 2013
Manuscript Accepted: July 15, 2013
Published: July 24, 2013

Citation
Xing Li, Guotao Liang, Zhenhua Li, Chunxiang Liu, and Chuanfu Cheng, "Tetrad phase vortex structure in scattered SPP field produced by silver nano-ring-slit under linearly polarized illumination," Opt. Express 21, 18442-18451 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-15-18442


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