Three-dimensional ultrasonic trapping of micro-particles in water with a simple and compact two-element transducer

Amanda Franklin, Asier Marzo, Robert Malkin, Bruce Drinkwater

Research output: Contribution to journalArticle (Academic Journal)

25 Citations (Scopus)
360 Downloads (Pure)

Abstract

We report a simple and compact piezoelectric transducer capable of stably trapping single and multiple micro-particles in water. A 3D-printed Fresnel lens is bonded to a two-element kerfless piezoceramic disk and actuated in a split-piston mode to produce an acoustic radiation force trap that is stable in three-dimensions. Polystyrene micro-particles in the Rayleigh regime (radius λ/14 to λ/7) are trapped at the focus of the lens (F# = 0.4) and manipulated in two-dimensions on an acoustically transparent membrane with a peak trap stiffness of 0.43 mN/m. Clusters of Rayleigh particles are also trapped and manipulated in three-dimensions, suspended in water against gravity. This transducer represents a significant simplification over previous acoustic devices used for micro-particle manipulation in liquids as it operates at relatively low frequency (688 kHz) and only requires a single electrical drive signal. This simplified device has potential for widespread use in applications such as micro-scale manufacturing and handling of cells or drug capsules in biomedical assays.
Original languageEnglish
Article number094101
Number of pages5
JournalApplied Physics Letters
Volume111
Early online date28 Aug 2017
DOIs
Publication statusPublished - Aug 2017

Keywords

  • Transducers
  • Chemical compounds
  • Cell communication
  • Ultrasonics
  • Acoustical measurements

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