Issue 1, 2022

Microfluidic acoustic sawtooth metasurfaces for patterning and separation using traveling surface acoustic waves

Abstract

We demonstrate a sawtooth-based metasurface approach for flexibly orienting acoustic fields in a microfluidic device driven by surface acoustic waves (SAW), where sub-wavelength channel features can be used to arbitrarily steer acoustic fringes in a microchannel. Compared to other acoustofluidic methods, only a single travelling wave is used, the fluidic pressure field is decoupled from the fluid domain's shape, and steerable pressure fields are a function of a simply constructed polydimethylsiloxane (PDMS) metasurface shape. Our results are relevant to microfluidic applications including the patterning, concentration, focusing, and separation of microparticles and cells.

Graphical abstract: Microfluidic acoustic sawtooth metasurfaces for patterning and separation using traveling surface acoustic waves

Supplementary files

Article information

Article type
Paper
Submitted
12 Aug. 2021
Accepted
30 Nov. 2021
First published
03 Dec. 2021

Lab Chip, 2022,22, 90-99

Microfluidic acoustic sawtooth metasurfaces for patterning and separation using traveling surface acoustic waves

M. Xu, P. V. S. Lee and D. J. Collins, Lab Chip, 2022, 22, 90 DOI: 10.1039/D1LC00711D

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