Omnidirectional reflection from Fibonacci quasi-periodic one-dimensional photonic crystal

It is shown that omnidirectional reflection (ODR) is possible from quasi-pe riodic isotropic dielectric stacks following a Fibonacci sequence (FS). The transition from truly periodic to fully quasi-periodic structure is invest igated by building periodic structures having unit cells made of FS of orde r j. The number of periods required to achieve ODR decreases as j increases until only a single period is required at which the structure is fully qua si-periodic. As compared to the periodic case, for the quasi-periodic struc ture the spectral range is wider, the thickness of the single layers is sma ller and the tolerance on the layer thicknesses is smaller. (C) 2001 Publis hed by Elsevier Science B.V.