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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 3 — Jan. 30, 2012
  • pp: 2858–2875

Coherence vortices in Mie scattered nonparaxial partially coherent beams

Madara L. Marasinghe, Malin Premaratne, David M. Paganin, and Miguel A. Alonso  »View Author Affiliations


Optics Express, Vol. 20, Issue 3, pp. 2858-2875 (2012)
http://dx.doi.org/10.1364/OE.20.002858


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Abstract

We have previously demonstrated that Mie scattering of partially coherent plane waves can create coherence vortices, namely screw-type dislocations in the phase of the spectral degree of coherence. However, plane waves are an idealization and in practice, optical beams are often much closer to reality. Thus, in this paper, we consider coherence vortices created by Mie scattering of partially coherent focused beams. We demonstrate that Mie scattering of partially coherent complex focused beams can give rise to coherence vortices. As the scattered fields propagate coherence vortex-antivortex pairs are annihilated thus creating hair-pin structures in the coherence-vortex nodal lines. The evolution of correlation singularities in the scattered field with the variation of the complex focus point of the incident beam is also discussed. The variation of the degree of polarization of the scattered field is also studied.

© 2012 OSA

OCIS Codes
(030.1640) Coherence and statistical optics : Coherence
(290.4020) Scattering : Mie theory
(290.5850) Scattering : Scattering, particles
(050.4865) Diffraction and gratings : Optical vortices
(290.5855) Scattering : Scattering, polarization
(260.6042) Physical optics : Singular optics

ToC Category:
Coherence and Statistical Optics

History
Original Manuscript: December 14, 2011
Revised Manuscript: January 9, 2012
Manuscript Accepted: January 11, 2012
Published: January 23, 2012

Citation
Madara L. Marasinghe, Malin Premaratne, David M. Paganin, and Miguel A. Alonso, "Coherence vortices in Mie scattered nonparaxial partially coherent beams," Opt. Express 20, 2858-2875 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-3-2858


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