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.