Huygens-Fresnel acoustic interference and the development of robust time-averaged patterns from travelling surface acoustic waves

Citsabehsan Devendran, David J. Collins, Ye Ai, Adrian Neild

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27 Citations (Scopus)


Periodic pattern generation using time-averaged acoustic forces conventionally requires the intersection of counterpropagating wave fields, where suspended micro-objects in a microfluidic system collect along force potential minimizing nodal or antinodal lines. Whereas this effect typically requires either multiple transducer elements or whole channel resonance, we report the generation of scalable periodic patterning positions without either of these conditions. A single propagating surface acoustic wave interacts with the proximal channel wall to produce a knife-edge effect according to the Huygens-Fresnel principle, where these cylindrically propagating waves interfere with classical wave fronts emanating from the substrate. We simulate these conditions and describe a model that accurately predicts the lateral spacing of these positions in a robust and novel approach to acoustic patterning.

Original languageEnglish
Article number154501
Number of pages6
JournalPhysical Review Letters
Issue number15
Publication statusPublished - 12 Apr 2017

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