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Strathprints serves world leading Open Access research by the University of Strathclyde, including research by the Strathclyde Institute of Pharmacy and Biomedical Sciences (SIPBS), where research centres such as the Industrial Biotechnology Innovation Centre (IBioIC), the Cancer Research UK Formulation Unit, SeaBioTech and the Centre for Biophotonics are based.

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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.