In this work transmission optics of opal photonic crystals and infiltrated with iron porphyrin was studied. Work analyses synthetic opal crystals grown by means of sedimentation from the spheres of SiO2. Samples were 0.9 mm thick, and their surfaces planes were parallel (111) to crystallographic planes. In these samples, the stop band due to Bragg reflection from the (111) plane was observed in the spectral region of 0.45-0.7 µm at angles of light incidence. Iron porphyries FeTTPS magnetic circular dichroism was also investigated. Synthetic opal crystals composed of silica spheres were infiltrated with (c=10 mM, pH=6.8) buffered phosphate solution of iron porphyrin. In optical studies the FeTPPS-impregnated opal samples were immersed in hexane solution to vary average refractive index of composite system and to control the mutual positions of the opal stop band and absorption bands of FeTPPS. FeTPPS magnetic circular dichroism spectra dependency on opal stop band position was noted.

The experimental opal transmission spectra date were analyzed in which the optical response of the opal and infiltrated with iron porphyrin was calculated by using a Bragg’s law and it was found that spacing between adjacent [111] lattice planes d is 254.95 nm, opal crystal composed of silica spheres of diameter is 312 nm and average refractive index of composite system – 1.35.

Raktažodžiai: opal, FeTTPS, opal-FeTTPS