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. Author manuscript; available in PMC: 2014 Apr 23.
Published in final edited form as: Lab Chip. 2011 Jun 27;11(14):2319–2324. doi: 10.1039/c1lc20042a

Fig. 3.

Fig. 3

Top-view images of the fluorescent particles recorded at different time snapshots. Particles are randomly distributed in the channel before the RF power is on (t = 0). After the RF signal is applied and the SSAW is generated, particles are focused laterally and vertically. The yellow dotted contours show three particles that are driven to the center of the channel (pressure nodal plane). The white dotted contours illustrate focusing in the vertical direction; these contours are enlarged on the right-side column. The three particles are out of focus before the signal is applied. When SSAW is generated, they start to migrate to the focal plane of the optical apparatus, implying migration in the y-direction (vertical direction).