Fig. 1: Simulation principle of chip focusing function.

a Sound field simulation of the microfluidic cross-section. b Correlation between sound pressure and substrate amplitude in the width direction. c SAW focusing effect from the top view. d Particle distribution simulation in microfluidic cross-section under the influence of SAW and flow focusing, the warmer particle colors represent areas with higher particle overlapping density. More information on this simulation study is provided in the Supplementary Information Section 3.