Document Type
Article
Version Deposited
Published Version
Publication Date
8-18-2021
Publication Title
Science Advances
DOI
10.1126/sciadv.abi5502
Abstract
Acoustic tweezers use ultrasound for contact-free, bio-compatible, and precise manipulation of particles from millimeter to submicrometer scale. In microfluidics, acoustic tweezers typically use an array of sources to create standing wave patterns that can trap and move objects in ways constrained by the limited complexity of the acoustic wave field. Here, we demonstrate spatially complex particle trapping and manipulation inside a boundary-free chamber using a single pair of sources and an engineered structure outside the chamber that we call a shadow waveguide. The shadow waveguide creates a tightly confined, spatially complex acoustic field inside the chamber without requiring any interior structure that would interfere with net flow or transport. Altering the input signals to the two sources creates trapped particle motion along an arbitrary path defined by the shadow waveguide. Particle trapping, particle manipulation and transport, and Thouless pumping are experimentally demonstrated.
Recommended Citation
Li J, Shen C, Huang TJ, Cummer SA. Acoustic tweezer with complex boundary-free trapping and transport channel controlled by shadow waveguides. Sci Adv. 2021 Aug 18;7(34):eabi5502. doi: 10.1126/sciadv.abi5502. PMID: 34407929; PMCID: PMC8373113.
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Comments
Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).