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We show that colloidal molecular crystal states interacting with a periodicsubstrate, such as an optical trap array, and a rotating external field canundergo a rapid pattern switching in which the orientation of the crystalchanges. In some cases, a martensitic-like symmetry switching occurs. It isalso possible to create a polarized state where the colloids in each substrateminima develop a director field which smoothly rotates with the external drive,similar to liquid crystal behavior. These results open the possibility forcreating novel types of devices using photonic band gap materials, and shouldbe generalizable to a variety of other condensed matter systems with multipleparticle trapping.

Pattern Switching and Polarizability for Colloids in Optical Trap Arrays