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Opt Lett. 2012 Apr 15;37(8):1286-8. doi: 10.1364/OL.37.001286.

4Pi focusing of spatially modulated radially polarized vortex beams.

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1
Department of Physics, Zhejiang University, Hangzhou 310027, China.

Abstract

We propose a method for generating focal beams with special intensity distributions using radially polarized vortex beams in a 4Pi configuration. A spherical dark-hollow beam and hollow beam array can be obtained by vortex beams with topological charge of m=1. A dark channel can be generated using vortex beams with topological charge of m=2. The length of the well-defined hollow beam array and the dark channel is about 30λ. These interesting beams are useful in optical trapping and manipulation.

PMID:
22513661
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