3-D manipulation: capturing, carrying, and releasing of millimeter- or micron-sized objects by an oscillating bubble attached on a 3-D traversing rod. (a) The bubble tip approaches the objects. Note that the piezo-actuator beneath the bottom substrate is still off. (b) When the bubble reaches close enough to the objects, the piezo actuator is turned on and oscillates the bubble. The oscillating bubble generates an attraction force and thus captures the objects. The dotted lines indicate vortical flows induced by the oscillating bubble (cavitational microstreaming) (c) The captured objects are carried as the rod is traversed in a 3-D space. Also note that the piezo-actuator remains on while the bubble is in traversing. (d) When the bubble reaches a destination, the piezo-actuator is off, resulting in releasing the carried objects.