Journal article
Helico-conical optical beams: a product of helical and conical phase fronts
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.
Language: | English |
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Year: | 2005 |
Pages: | 1749-1760 |
ISSN: | 10944087 |
Types: | Journal article |
DOI: | 10.1364/OPEX.13.001749 |
ORCIDs: | Rodrigo, P.J. |