FIG. 7.

Phase diagram of beads motion relative to the applied field strength and driving frequency. The first critical frequency, f_c1, divides the phase-locked and phase-slipping dynamical regimes (black squares and black lines). The second critical frequency, f_c2, divides the phase-slipping and phase-insulated regimes (red circles and red lines). The inset graph presents the maximum velocity of the beads in the phase-locked regime. And the inset microscope image presents the trapped bead at one specific location in the phase-insulated regime. (Multimedia view) [URL: http://dx.doi.org/10.1063/1.4936219.3]Download video file ^{(1,001.9KB, mp4)} DOI: 10.1063/1.4936219.3