Emission of globular SiO 2 photonic crystals infiltrated with dielectrics is observed within a wide spectral region under excitation with the light wavelength λ = 400 nm. The first part of the emission spectrum located in the vicinity of the excitation line depends on infiltrated substance and is explained by surface-enhanced Raman scattering effect. The second one lying in the region of 440-650 nm that includes the stop-band is caused by spontaneous parametric down-conversion. PACS:78.67-n + 78.55.Mb UDC: 535.361

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Abstract. 'Opal-tellurium dioxide' nanocomposite has been obtained by filling opal pores with a melt of fine dispersive polycrystalline α-TeO 2 powder. The Raman spectrum of the composite has been measured in the region of 50-1100 cm -1 and compared with the spectra peculiar for polycrystalline α-TeO 2 powder and the corresponding single crystals. Besides of the Raman bands corresponding to α-TeO 2 lattice vibrations, other bands have been detected in the spectrum of the composite. Their spectral positions coincide fairly well with those available in the spectrum of γ-TeO 2 .