Dexterous manipulation of microparticles using Bessel-function acoustic pressure fields

Charles R.P. Courtney, Bruce W. Drinkwater, Christine E.M. Demore, Sandy Cochran, Alon Grinenko, Paul D. Wilcox

    Research output: Contribution to journalArticlepeer-review

    131 Citations (Scopus)


    We show that Bessel-function acoustic pressure fields can be used to trap and controllably position microparticles. A circular, 16-element ultrasound array generates and manipulates an acoustic field within a chamber, trapping microparticles and agglomerates. Changes in the phase of the sinusoidal signals applied to the array elements result in the movement of the Bessel-function pressure field and hence the microparticles. This demonstrates ultrasonic manipulation analogous to holographic optical tweezers. The manipulation limits of the device are explained by the existence of unwanted resonances within the manipulation chamber.
    Original languageEnglish
    JournalApplied Physics Letters
    Issue number12
    Publication statusPublished - 2013


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