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The Strathprints institutional repository is a digital archive of University of Strathclyde's Open Access research outputs. Strathprints provides access to thousands of Open Access research papers by University of Strathclyde researchers, including by researchers from the Department of Computer & Information Sciences involved in mathematically structured programming, similarity and metric search, computer security, software systems, combinatronics and digital health.

The Department also includes the iSchool Research Group, which performs leading research into socio-technical phenomena and topics such as information retrieval and information seeking behaviour.

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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.