The Force of Sound: CEA-Leti Manipulates Cells & Bacteria Samples Using Non-contact Evanescent Acoustic TweezersEvanescent 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.