Fig. 4
From: Crossover from positive to negative optical torque in mesoscale optical matter
FDTD-particle dynamics simulation of light-driven self-organization and rotation of mesoscale optical matter arrays. a Rotation of optical matter arrays with neutral NPs governed by optical binding interactions for different numbers of particles in the array. Directions of rotation are indicated by red to green color with open circles showing the final positions of the NPs. The duration of the trajectory is labeled in each panel. b Rotation of optical matter arrays of charged NPs whose structures are determined by both optical binding and electrostatic interactions. c Average nearest neighbor distances (davg) for the arrays with and without added charges. d Calculated optical torques on charged and uncharged arrays. Torque values for type-II and III arrays are also shown for comparison. Data points are mean values with one standard deviation error bars in both c and d
