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9 February 2007 Three-dimensional intensity distribution of helico-conical optical beams
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Helico-conical optical beams are a recently introduced class of beams that multiplicatively combine helical and conical phase fronts. Focusing these beams leads to a spiral intensity distribution at the focal plane of the lens. Further theoretical and experimental examination reveals interesting three-dimensional intensity patterns near the focal region, including a cork-screw structure around the optical axis. Variations on these light distributions based on the superposition of multiple helico-conical beams are also presented here. These beams are expected to yield interesting dynamics when applied to the optical trapping of microscopic particles, such as dielectric microspheres or even biological cells.
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Carlo Amadeo Alonzo, Peter John Rodrigo, Ivan R. Perch-Nielsen, and Jesper Glückstad "Three-dimensional intensity distribution of helico-conical optical beams", Proc. SPIE 6483, Complex Light and Optical Forces, 64830O (9 February 2007); doi: 10.1117/12.700055;

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