Huygens-Fresnel Acoustic Interference and the Development of Robust Time-Averaged Patterns from Traveling Surface Acoustic Waves
Citsabehsan Devendran, David J Collins, Ye Ai, Adrian Neild
PHYSICAL REVIEW LETTERS | AMER PHYSICAL SOC | Published : 2017
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..View full abstract
Awarded by Australian Research Council
Awarded by Singapore Ministry of Education Academic Research Fund Tier 2
We gratefully acknowledge support received from the Australian Research Council, Grant No. DP160101263 awarded to A. N. This work was performed in part at the Melbourne Centre for Nanofabrication (MCN) in the Victorian Node of the Australian National Fabrication Facility (ANFF). This research was undertaken with the assistance of resources from the National Computational Infrastructure (NCI), which is supported by the Australian Government. We gratefully acknowledge support received from Singapore Ministry of Education Academic Research Fund Tier 2 (T2MOE1603) awarded to Y. A.