We study the transmittivity spectra of one-dimensional finite three-periodic photonic crystals of the structure [(ab)N(cd)M]K composed of four different layers a, b, c, and d being dielectric oxides Al2O3, SiO2, TiO2, and ZrO2, respectively. We analyze modification of the transmittivity spectra of near-infrared electromagnetic waves of the TE and TM polarizations in the vicinity of the photonic bandgaps with variations of the sub-cell numbers N and M and super-cell number K, the incidence angle, and the order of the layers in the structure. We propose the classification of three-periodic photonic crystals by the magnitude and sign of the optical contrast between the layers in pairs (ab) and (cd) forming the sub-cells and discuss common spectral properties as well as their differences in these structures.
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