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Transfer of orbital angular momentum from a super-continuum, white-light beam

Wright, A.J. and Girkin, J.M. and Gibson, G.M. and Leach, J. and Padgett, M.J. (2008) Transfer of orbital angular momentum from a super-continuum, white-light beam. Optics Express, 16 (13). pp. 9495-9500. ISSN 1094-4087

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Abstract

Beams with helical phasefronts described by exp(iφ ) carry an orbital angular momentum equivalent to ¯h per photon. Using diffractive optics this helical phase structure can be applied to every spectral component of the beam such that a spatially coherent white-light beam can carry orbital angular momentum without any chromatic distortion. This achromatic property can be hard to achieve in spin angular momentum where pure circular polarization is difficult to maintain across a finite spectral bandwidth.We illustrate the achromatic, helical phase structure of a white-light beam by observing the transfer of its orbital angular momentum to particles held in optical tweezers.

Item type: Article
ID code: 13963
Keywords: spatial light modulators, optical vortices, diffraction, optical devices, optics, Optics. Light
Subjects: Science > Physics > Optics. Light
Department: Faculty of Science > Institute of Photonics
Related URLs:
Depositing user: Miss Lisa Flanagan
Date Deposited: 09 Dec 2009 16:46
Last modified: 21 May 2013 16:44
URI: http://strathprints.strath.ac.uk/id/eprint/13963

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