Picture of neon light reading 'Open'

Discover open research at Strathprints as part of International Open Access Week!

23-29 October 2017 is International Open Access Week. The Strathprints institutional repository is a digital archive of Open Access research outputs, all produced by University of Strathclyde researchers.

Explore recent world leading Open Access research content this Open Access Week from across Strathclyde's many research active faculties: Engineering, Science, Humanities, Arts & Social Sciences and Strathclyde Business School.

Explore all Strathclyde Open Access research outputs...

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

Full text not available in this repository. Request a copy from the Strathclyde author

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.