Photonic band gaps and localization in two-dimensional metallic quasicrystals

We report on experimental observation of photonic stop bands in two-dimensi onal metallic Penrose lattice. We investigated the defect characteristics, and observed strongly localized cavity modes below the plasma frequency. Th e absence of the translational symmetry allowed to change the defect freque ncies and localization properties of the defect modes. Propagation of photo ns along highly localized coupled-cavity modes was experimentally demonstra ted in quasiperiodic metallic structures.