2016/01/15 by Antoine Riaud, Riaud, Antoine, Michaël Baudoin +5 · 1 citation
Engineering · #Electrowetting and Microfluidic Technologies #FOS: Physical sciences #Fluid Dynamics (physics.flu-dyn) #Microfluidic and Bio-sensing Technologies #Microfluidic and Capillary Electrophoresis Applications
paper · pdf · doi:10.48550/arxiv.1601.03886
openalex publication_date 2016/01/15 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Surface acoustic waves (SAWs) are versatile tools to manipulate fluids at\nsmall scales for microfluidics and bio- logical applications. A non-exhaustive\nlist of operations that can be performed with SAW includes sessile droplet\ndisplacement, atomization, division and merging but also the actuation of\nfluids embedded in microchannels or the manipulation of suspended particles.\nHowever, each of these operations requires a specific design of the wave\ngeneration system, the so-called interdigitated transducers (IDTs). Depending\non the application, it might indeed be necessary to generate focused or plane,\npropagating or standing, aligned or shifted waves. Furthermore, the\npossibilities offered by more complex wave-fields such as acoustical vortices\nfor particle tweezing and liquid twisting cannot be explored with classical\nIDTs. In this paper, we show that the inverse filter technique coupled with an\ninterdigitated transducers array (IDTA) enables to synthesize all classical\nwave-fields used in microfluidics and biological applications with a single\nmulti- function platform. It also enables to generate swirling SAWs, whose\npotential for the on-chip synthesis of tailored acoustical vortices has been\ndemonstrated lately. The possibilities offered by this platform is illustrated\nby performing successively many operations on sessile droplets with the same\nsystem.\n