It is shown, in the case of one-dimensional photonic crystals, that the transmission gaps are caused by the existence of resonance phenomena inside the layers which constitute the crystal. From a mathematical point of view, these resonances are associated with poles and zeros in the complex plane of the wavenumber k. Transmission gaps are located outside these resonance regions. A phenomenological formula allows us to represent quantitatively the transmission inside the gaps. Finally, a synthetic explanation of the properties of doped and non-doped crystals is proposed and it is shown that the transmission peaks inside the gaps of doped photonic crystals are caused by a shift of poles and zeros located inside the resonance regions of non-doped crystals. [References: 21]
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