By spectral transmission measurements the optical stop-bands in 3D periodic SiO_2 matrices (synthetic opals) are studied as a function of the refractive index contrast. In order to vary the refractive index contrast the pores of opals were filled with various liquids and with semiconductor microcrystals. In the latter case a dramnatic decrease of Bragg-defined light attentuation length within the stop-band was observed indicating strong perturbation of photonic states. The parameters of photonic lattice of the synthetic opals required to achieve a prominent depletion of the photonic density of states (pseudogap) are estimated.
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