Abstract
A method is presented to design a layer structure, consisting of a few different
one-dimensional photonic crystals merged together, having an extended band gap. Hereby,
the thicknesses of the two layers of each unit cell, corresponding to the involved
photonic crystals, are optimized using a genetic algorithm. As numerical examples, two
structures are constructed by this method, one structure is composed of four
one-dimensional photonic crystals by using TiO$_{2}$ and SiO$_{2}$, the other is
composed of two one-dimensional photonic crystals based on two materials with the
refractive index of 4.6 and 1.6. Their theoretical omnidirectional relative bandwidths
(defined as the gap to midgap ratio) are 51.36% and 91.72% respectively. The reflection
spectra calculated by the transfer matrix method agree with the correspondent band gap.
© 2010 IEEE
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