18 August 2005 Colloidal holography and crystal dislocations
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Abstract
The analogous nature of dislocations in crystals and light leads to some interesting links between the properties of optical and crystal dislocations. A dislocation in a crystal can be described by a Burgers vector b, whilst a dislocation in a laser mode such as the vortex in a Laguerre Gaussian beam, can be described by a topological charge l2. By illuminating both optically trapped and self-assembled two-dimensional colloidal crystals with a Gaussian laser beam, we show a direct link between crystal and light dislocations, where the first order diffraction pattern from a crystal with Burgers' vector b = na contains vortex laser modes of topological charge l=±mn, (where n is an integer, a is the lattice constant of the crystal and m is an integer corresponding to the diffraction order).
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Michael P. MacDonald, Michael P. MacDonald, Paul Prentice, Paul Prentice, Kishan Dholakia, Kishan Dholakia, "Colloidal holography and crystal dislocations", Proc. SPIE 5930, Optical Trapping and Optical Micromanipulation II, 593017 (18 August 2005); doi: 10.1117/12.614843; https://doi.org/10.1117/12.614843
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