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OET meets acoustic tweezing

We present a micromanipulation system based on dielectrophoretic and acoustophoretic particle tweezing. The combination of non-uniform electrical fields and standing pressure waves is applied to a microfluidic chip and provides essential functions including concentration, focussing, guiding, trapping and sorting of microparticles. Dielectrophoresis is achieved using a photoconductor integrated into a microchannel chip which generates electric fields upon illumination. Acoustophoresis is achieved utilizing a surface acoustic wave device which transmits ultrasound into the chip and forms a pressure standing wave under resonance conditions. The system is characterized in terms of coupling of acoustic energy into the chip as well as dielectrophoretic trapping and guiding efficiency. The individual control of each techniques is demonstrated and applied for sorting of polystyrene beads by dielectrophoretic and acoustophoretic forces.