A new technique for the arrangement of microsized particles with site-controlled deposition has been demonstrated. Positively charged dots are drawn with a focused Ga+ ion beam. Monodisperse particles are selectively attracted to the electric field of the dots in a one-to-one relationship. Thus two-dimensional arrays of deposited spheres can be formed with controlled spacing (see Figure).
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Fudouzi et al. (2002) studied this question.