Figure 10.

The 2D dipolar colloidal crystal is assembled in several steps by using the laser tweezers to grab and manipulate the colloidal particles. (a) The dipolar colloidal particles are pairwise assembled into dipolar colloidal chains. (b) Individual dipolar chains are assembled into small 2D colloidal crystallites. (c) Additional dipolar chains are brought close to the already assembled structures so that they spontaneously assemble into large 2D colloidal crystals. Scale bar, 5 µm. Adapted from Ref. [2].