Optical characterization of natural and synthetic opals by Bragg reflection spectroscopy
- Cite this article as:
- Kavtreva, O.A., Ankudinov, A.V., Bazhenova, A.G. et al. Phys. Solid State (2007) 49: 708. doi:10.1134/S106378340704018X
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The Bragg reflection of light from natural and synthetic opals was studied experimentally, and the samples were characterized by atomic-force microscopy. The reflection spectra were theoretically calculated within the model of a planar, periodically layered medium. A comparison of the experimental and calculated data made it possible to determine the parameters of the crystal structure of synthetic opals (lattice constants and sintering coefficients of a-SiO2 particles). It was concluded that the pores in the structure of natural opals are filled by a material with a refractive index close to that of a-SiO2.