A snowman-like array of colloidal dimers for antireflecting surfaces

Fabrication of motheye-like colloidal surface patterns as an antireflection coating is presented. Using layer-by-layer assembly and a novel colloid-on-colloid stamping strategy, snowman-like patterns consisting of different-sized colloids were fabricated (see Figure). The pattern spacing and height can be easily tailored by varying the salt concentration and the number of colloidal layers attached, respectively.