Fig. 4
Particle hopping induced by particle aggregation. a Model for calculating mean first passage time of the particle in the potential well. b Illustration of hopping of the particle pair between adjacent hotspots. c Potential wells of total force Ft plotted along x-axis at y = 0 and z = 20 μm with different contact angles. d Calculated mean first passage time of the red particle varies with contact angle θ. Experimental residence time is distributed in the yellow area. e Experimental demonstration of the particle hopping induced by particle aggregation in the optofluidic lattice
