Abstract
Photonic crystals are artificial periodic structures in which the refractive index modulation gives rise to stop bands for electromagnetic waves (EM) within a certain frequency range in all directions.1 Recently it was recognized that the photonic gaps can exist in two-dimensional (2D) octagonal quasicrystals.2 A quasiperiodic system is characterized by a lack of long range periodic translational order. But the quasiperiodic system has long-range band orientational order, so that it can be considered as an intermediate between periodic and random systems.3
© 2001 Optical Society of America
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