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(a) A “cross” gap defined by four rectangular electrodes. (c) The diagonal pairs of electrodes are electrically connected and between the pairs an AC voltages is applied. Calculated electric field lines and equipotential contours in color are shown in (a) for the central region and (e) away from the central region. The actual assemblies of nanowires under VAC = 5 V and f = 1 MHz are shown in (d) with the enclosed areas enlarged in (b) and (f).
