, Volume 49, Issue 4, pp 708-714

Optical characterization of natural and synthetic opals by Bragg reflection spectroscopy

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Abstract

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.

Original Russian Text © O.A. Kavtreva, A.V. Ankudinov, A.G. Bazhenova, Yu.A. Kumzerov, M.F. Limonov, K.B. Samusev, A.V. Sel’kin, 2007, published in Fizika Tverdogo Tela, 2007, Vol. 49, No. 4, pp. 674–680.