20 August 2009 Optical trapping and binding in evanescent optical landscapes
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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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L. Y. Wong, L. Y. Wong, C. D. Bain, C. D. Bain, } "Optical trapping and binding in evanescent optical landscapes", Proc. SPIE 7400, Optical Trapping and Optical Micromanipulation VI, 74001F (20 August 2009); doi: 10.1117/12.827349; https://doi.org/10.1117/12.827349

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