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Updated: Sep 15, 2025
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Microparticle Manipulation by Standing Surface Acoustic Waves with Dual-frequency Excitations
Published on: August 21, 2018
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Dynamic sub-wavelength microparticle patterning via phase-modulated pulsing coherent surface acoustic wave tweezers
Xin Li1,2, Deqing Mei2, Hemin Pan2
1State Key Laboratory of Fluid Power and Mechatronic Systems, School of Mechanical Engineering, Zhejiang University, Hangzhou 310058, China. yanchwang@zju.edu.cn.
Lab on a Chip
|July 16, 2025
Summary
Researchers developed a new acoustic tweezers method using phase-modulated pulsing coherent surface acoustic waves (SAW). This technique allows for dynamic microparticle patterning with adjustable, sub-wavelength spacing, overcoming limitations of traditional acoustic tweezers.
Area of Science:
- Acoustic manipulation
- Microparticle patterning
- Surface acoustic waves (SAW) technology
Background:
- Acoustic tweezers offer non-contact manipulation for cell culture, drug delivery, and tissue engineering.
- Current surface acoustic wave (SAW)-based tweezers have limited patterning resolution due to interdigital transducer (IDT) finger width.
- This limitation restricts the versatility and maneuverability of SAW tweezers.
Purpose of the Study:
- To introduce a novel phase-modulated pulsing coherent SAW method for microparticle manipulation.
- To overcome the resolution limitations imposed by uniform-finger-width IDTs in SAW tweezers.
- To enable dynamic microparticle patterning with adjustable, sub-wavelength spacing.
Main Methods:
- Utilizing a phase-modulated pulsing coherent SAW approach to modulate phase differences between counter-propagating SAWs.
- Employing a highly reflective interlayer to create a distinct acoustic pressure field and suppress traveling waves.
- Sequentially shifting standing waves through phase modulation to control particle arrangement.
Main Results:
- Achieved dynamic microparticle patterning with adjustable, sub-wavelength spacing using uniform-finger-width IDTs.
- Demonstrated pattern spacings of one-half and one-third of the original period.
- Successfully realized variable particle density distributions through phase modulation.
Conclusions:
- The developed phase-modulated pulsing coherent SAW method significantly enhances the flexibility and precision of acoustic tweezers.
- This technique overcomes the inherent resolution constraints of traditional SAW tweezers.
- Enables advanced applications in microparticle manipulation for various scientific fields.
