Modelling for the robust design of layered resonators for ultrasonic particle manipulation

Townsend, R.J., Hill, M. and Harris, N.R. (2007) Modelling for the robust design of layered resonators for ultrasonic particle manipulation. International Congress on Ultrasonics (2007 ICU Vienna), , Vienna, Austria. 08 - 11 Apr 2007. p. 148 .

Abstract

Several approaches have been described for the manipulation of particles within an ultrasonic field. Of those based on standing waves, devices in which the critical dimension of the resonant chamber is less than a wavelength are particularly well suited to microfluidic, or “lab on a chip” applications. These might include pre-processing or fractionation of samples prior to analysis, formation of monolayers for cell interaction studies, or the enhancement of biosensor detection capability. The small size of microfluidic resonators typically places tight tolerances on the positioning of the acoustic node, and such systems are required to have high transduction efficiencies, for reasons of power availability and temperature stability. Further, the expense of many microfabrication methods precludes an iterative experimental approach to their development. Hence, the ability to design subwavelength resonators that are efficient, robust and have the appropriate acoustic energy distribution is extremely important. This paper discusses one-dimensional modelling used in the design of ultrasonic resonators for particle manipulation and gives example of their uses to predict and explain resonator behaviour. Particular difficulties in the modelling of quarter wave systems are highlighted. Keywords: acoustic radiation force, layered resonators, robust design, particle manipulation

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Contributors

Author: M. Hill

Author: N.R. Harris

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