Optical vortices produced by diffraction from dislocations in two-dimensional colloidal crystals

MacDonald, M.P., Prentice, P. and Dholakia, K. (2006) Optical vortices produced by diffraction from dislocations in two-dimensional colloidal crystals. New Journal of Physics, 8(10), p. 257. (doi:10.1088/1367-2630/8/10/257)

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Abstract

A dislocation in a crystal can be described by a Burger's vector b, whilst a screw dislocation in a laser mode can be described by a topological charge l. By illuminating both optically trapped and self-assembled two-dimensional (2D) colloidal crystals with a Gaussian laser beam, we show a correspondence between crystal and optical dislocations, where the first order diffraction pattern from a crystal with Burgers' vector b = na consists of vortex laser modes of topological charge l = ±mn, (n = integer, a = lattice constant and m = diffraction order).

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Prentice, Dr Paul
Authors: MacDonald, M.P., Prentice, P., and Dholakia, K.
College/School:College of Science and Engineering > School of Engineering > Systems Power and Energy
Journal Name:New Journal of Physics
Publisher:Institute of Physics Publishing Ltd.
ISSN:1367-2630
ISSN (Online):1367-2630
Published Online:26 October 2006

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