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Updated: Aug 30, 2025

Microparticle Manipulation by Standing Surface Acoustic Waves with Dual-frequency Excitations
Published on: August 21, 2018
Periodic switching of acoustic radiation force with beat created by multitone field
Hiroya Tanaka1, Keita Funayama2, Yukihiro Tadokoro2
1Toyota Central Research & Development Laboratories., Inc., Nagakute, 480-1192, Japan. tanak@mosk.tytlabs.co.jp.
Abstract:
Acoustic radiation force plays a key role in microfluidic systems for particle and cell manipulation. In this study, we investigate the acoustic radiation force resulting from synthesized ultrasounds that are emitted from multiple sound sources with slightly different oscillation frequencies. Due to the synthesized field, the acoustic radiation force is expressed as the sum of a dc component and harmonics of fundamental frequencies of a few hertz. This induces the beat of the acoustic radiation force. We demonstrate that the synthesized field provides the periodic on/off switching of the acoustic radiation force associated with the one denominational planar standing wave in a straight microfluidic channel. Consequently, our system can temporally manipulate acoustic radiation force without active controls.
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