Programmable photoacoustic patterning of microparticles in air

Ruoqin Zhang, Xichuan Zhao, Jinzhi Li, Di Zhou, Honglian Guo (), Zhi-yuan Li () and Feng Li ()
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Ruoqin Zhang: South China University of Technology
Xichuan Zhao: Minzu University of China
Jinzhi Li: Beijing Institute of Technology
Di Zhou: Beijing Institute of Technology
Honglian Guo: Minzu University of China
Zhi-yuan Li: South China University of Technology
Feng Li: Beijing Institute of Technology

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: Abstract Optical and acoustic tweezers, despite operating on different physical principles, offer non-contact manipulation of microscopic and mesoscopic objects, making them essential in fields like cell biology, medicine, and nanotechnology. The advantages and limitations of optical and acoustic manipulation complement each other, particularly in terms of trapping size, force intensity, and flexibility. We use photoacoustic effects to generate localized Lamb wave fields capable of mapping arbitrary laser pattern shapes. By using localized Lamb waves to vibrate the surface of the multilayer membrane, we can pattern tens of thousands of microscopic particles into the desired pattern simultaneously. Moreover, by quickly and successively adjusting the laser shape, microparticles flow dynamically along the corresponding elastic wave fields, creating a frame-by-frame animation. Our approach merges the programmable adaptability of optical tweezers with the potent manipulation capabilities of acoustic waves, paving the way for wave-based manipulation techniques, such as microparticle assembly, biological synthesis, and microsystems.

Date: 2024
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DOI: 10.1038/s41467-024-47631-8

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