Photonic band-gap effect, localization, and waveguiding in the two-dimensional Penrose lattice - art. no. 161104

We report experimental observation of a full photonic band gap in a two-dim ensional Penrose lattice made of dielectric rods. Tightly confined defect m odes having high quality factors were observed. Absence of the translationa l symmetry in Penrose lattice was used to change the defect frequency withi n the stop band. We also achieved the guiding and bending of electromagneti c waves through a row of missing rods. Propagation of photons along highly localized coupled-cavity modes was experimentally demonstrated and analyzed within the tight-binding approximation.