Abstract
Acoustic manipulation of particles, as a non-contact and non-damage method, has attracted much interest in recent years. Here, we present a platform for sound-driven particle delivery realized on an artificially engineered metal plate with manipulated, graded acoustic field distribution. By fabricating gratings with graded height on one surface of the structured plate, we obtain graded acoustic pressure distribution near the smooth surface of the plate. The acoustic field can be tuned at different positions by regulating the operating frequency, which originates from the gratings of different heights corresponding to different resonant frequencies. Therefore, from the effect of the acoustic radiation force exerted by this gradient field, a particle will transfer on the plate just by the frequency being tuned, without moving the acoustic source. Our theoretical analysis agrees well with the experimental demonstration. This work will lead to potential applications in drug delivery and microfluidics.
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