Evanescent optical landscapes are created by the total internal reflection (TIR) of two
counterpropagating laser beams, and used to trap large numbers of submicron particles. Varying the
size of dielectric particles and the polarisations of the incident beams results in arrays of different
symmetries and lattice spacings. The kinetically formed array is not necessarily the lowest energy
structure and spontaneous transitions to alternative packings are sometimes observed. Arrays can
build up large amounts of strain energy that can result in the sudden ejection of streams of particles
from the array. Nanoparticles of Au show long-range optical binding, but do not form regular arrays.
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