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Tuesday, May 26, 2015

Creating and probing of a perfect vortex in situ with an optically trapped particle

Mingzhou Chen, Michael Mazilu, Yoshihiko Arita, Ewan M. Wright, Kishan Dholakia

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.

DOI
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