Microfluidic acoustic sawtooth metasurfaces for patterning and separation using traveling surface acoustic waves
Mingxin Xu, Peter Vee Sin Lee, David J. Collins
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.
Topics & Concepts
Sawtooth wavePolydimethylsiloxaneMicrofluidicsMicrochannelAcousticsFluidicsAcoustic waveMaterials scienceSurface acoustic waveWavelengthSound pressureOpticsOptoelectronicsPhysicsNanotechnologyEngineeringTelecommunicationsElectrical engineeringMicrofluidic and Bio-sensing TechnologiesAcoustic Wave Phenomena ResearchNanopore and Nanochannel Transport Studies