Abstract
In alternating current electrokinetics, electric fields are used togenerate forces on particles. Techniques have been applied for themanipulation of particles and the measurement of their dielectric properties.The fields are typically generated by microelectrode structures fabricated onplanar surfaces. One particular design, using interdigitated bar electrodes,is used both in dielectrophoretic field flow fractionation and travelling wavedielectrophoresis. This paper presents a Fourier series analysis of thedielectrophoretic force on a particle generated by this type of electrodearray, for both dielectrophoresis and travelling wave dielectrophoresis.Simple expressions are derived for the force at a distance of the order of theelectrode spacing from the electrodes. A full analytical expression is givenfor the dielectrophoretic force in two dimensions. Comparisons are made withpreviously published experimental observations.
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