TY - JOUR
T1 - Optical vortices produced by diffraction from dislocations in two-dimensional colloidal crystals
AU - MacDonald, M. P.
AU - Prentice, P.
AU - Dholakia, K.
PY - 2006/10/26
Y1 - 2006/10/26
N2 - 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).
AB - 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).
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U2 - 10.1088/1367-2630/8/10/257
DO - 10.1088/1367-2630/8/10/257
M3 - Article
AN - SCOPUS:33750471599
VL - 8
JO - New Journal of Physics
JF - New Journal of Physics
SN - 1367-2630
M1 - 257
ER -