Abstract
Abstract In this paper, an acoustic particle manipulation device is proposed to realize multi-function particle operation in a droplet. A curved slanted-finger interdigital transducer is designed to excite surface acoustic wave (SAW) in different resonance frequency. Diversity acoustic pressure field can be formed by turning the excitation frequency of the transducer. Moreover, through switching the excitation combination of the interdigital transducers, different acoustic field distributions can be aotained and diversity acoustic stream can be formed in the droplet. A finite element model is setup to study the acoustic field distribution and acoustic stream. Simulation results show that when a single frequency SAW is excited, acoustic streaming can be formed in the fluid and the particles can be rotated in the droplet. By switching the excitation frequency of the interdigital transducer, the direction of acoustic stream can be changed. In addition, the interdigital transducer can simultaneously excite multiple surface acoustic waves of different frequencies, which can manipulate the particles move in different tragectory. The study provides an effectively device to multi-function particle manipulation.
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