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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 13, Iss. 5 — Mar. 7, 2005
  • pp: 1749–1760

Helico-conical optical beams: a product of helical and conical phase fronts

Carlo Amadeo Alonzo, Peter John Rodrigo, and Jesper Glückstad  »View Author Affiliations

Optics Express, Vol. 13, Issue 5, pp. 1749-1760 (2005)

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Helico-conical optical beams, different from higher-order Bessel beams, are generated with a parallel-aligned nematic liquid crystal spatial light modulator (SLM) by multiplying helical and conical phase functions leading to a nonseparable radial and azimuthal phase dependence. The intensity distributions of the focused beams are explored in two- and three-dimensions. In contrast to the ring shape formed by a focused optical vortex, a helico-conical beam produces a spiral intensity distribution at the focal plane. Simple scaling relationships are found between observed spiral geometry and initial phase distributions. Observations near the focal plane further reveal a cork-screw intensity distribution around the propagation axis. These light distributions, and variations upon them, may find use for optical trapping and manipulation of mesoscopic particles.

© 2005 Optical Society of America

OCIS Codes
(050.1970) Diffraction and gratings : Diffractive optics
(070.0070) Fourier optics and signal processing : Fourier optics and signal processing
(140.7010) Lasers and laser optics : Laser trapping
(230.6120) Optical devices : Spatial light modulators

ToC Category:
Research Papers

Original Manuscript: January 18, 2005
Revised Manuscript: February 6, 2005
Published: March 7, 2005

Carlo Alonzo, Peter John Rodrigo, and Jesper Glückstad, "Helico-conical optical beams: a product of helical and conical phase fronts," Opt. Express 13, 1749-1760 (2005)

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