Creating and probing of a perfect vortex in situ with an optically trapped particle
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We experimentally create a ‘perfect’ vortex beam, which has a uniform ring profile and fixed radius. In contrast with other vortex fields, the intensity profile is independent of its topological charge. We then correct this field in situ using a single trapped particle as a probe. This results in a constant angular velocity for the particle regardless of its position on the beam circumference.
KeywordsOptical vortices Optical manipulation Optical tweezers
The authors would like to thank the UK Engineering and Physical Sciences Research Council (EPSRC) for funding.
- 3.J. Curtis, D.G. Grier, Phys. Rev. Lett. 90, 133901 (2003)Google Scholar