We decorated nano particles of different metal structure on SiO2 nano-spheres on the top layer of SiO2 opal photonic crystals using glancing angle deposition (GLAD) method ,then we annealed the metal films to allow the metal to agglomerate forming chain structure.We investigated their effect on the optical properties of the opal. Keyword:opal, Ag chain structure, Fluorescence, Enhancement of fluorescence.