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Microparticle Manipulation by Standing Surface Acoustic Waves with Dual-frequency Excitations

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Published on: August 21, 2018

Efficient Particle Aggregation Through SSAW Phase Modulation.

Yiming Li¹, Zekai Li¹, Zuozhi Wei²

¹Department of Engineering, University of Cambridge, Cambridge CB2 1PZ, UK.

|August 28, 2025

Summary

This study introduces a dual-sided standing surface acoustic wave (SSAW) device for enhanced microparticle manipulation. The novel design and dynamic phase modulation enable rapid, precise particle aggregation in microchannels.

Keywords:

acoustofluidics microfluidics particle manipulation surface acoustic waves

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Area of Science:

Acoustofluidics
Microfluidics
Surface Acoustic Waves

Background:

Surface acoustic wave (SAW) devices offer particle and fluid manipulation in microchannels.
Existing SAW devices have limitations in flexibility, efficiency, and spatial resolution.

Purpose of the Study:

To develop a dual-sided standing surface acoustic wave (SSAW) device for improved microparticle control.
To investigate dynamic phase modulation strategies for efficient particle aggregation.

Main Methods:

Developed a dual-sided SSAW device with two piezoelectric substrates and interdigital transducers (IDTs).
Created a 2D numerical model to analyze SAW phase modulation effects on acoustic fields.
Examined single-particle motion under phase-modulated acoustic fields to optimize strategies.

Main Results:

The dual-sided SSAW device provides highly flexible microparticle control.
Optimized phase modulation strategies maximized lateral motion and minimized vertical motion.
Achieved rapid and precise aggregation of microparticles to a single focal point.

Conclusions:

The dual-sided SSAW configuration offers advanced acoustofluidic capabilities.
Dynamic phase modulation is key for efficient spatiotemporal particle concentration.
This technology advances microparticle manipulation in microfluidic systems.