Provided are compositions that include a dielectric matrix material (222) defining multiple voids (224) of substantially uniform respective dimension and configured as a substantially uniform array. The voids may be configured such that charges that accumulate at surfaces of at least some of the voids when the composition is immersed in a uniform external electric field interact with charges that accumulate at surfaces of at least others of the voids to cause movement of the respective charges in a direction having a component transverse to the electric field. Hollow particles (226) may be disposed within respective voids of the array of voids defined by the matrix material. Associated devices are also provided.