Evanescent Acoustic Beam Moves Suspended Particles at Lower Cost & Energy Consumption Than Existing Propagative Surface Acoustic Wave (SAW) Systems. CEA-Leti has developed a new acousto-microfluidic technology for manipulating microand nanoscale samples using evanescent sound waves. Described in a paper published in the September issue of Nature (Comm. Phys), the technique is envisioned to replace existing technology, which uses high-frequency propagative surface acoustic waves (leaky SAW) to move microscopic samples on complex substrates. CEA-Leti's innovative technique generates an evanescent Bessel beam in the low-frequency ultrasound (kHz range). Thanks to the enhanced radiation force arising from the evanescent field, this beam makes it possible to pattern living organisms as small as bacteria along concentric circles on a simple substrate. "The novelty of our approach is the ability to do exactly the same thing that people did in the propagative SAW domain using high frequency," said CEA-Leti scientist Cédric Poulain.
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