In the paper we carry out the mathematical procession of the experimental data, which has been previously obtained during the research of the optical properties of the new nanocomposite material Ag / opal. We give the arguments in favour of the interpretation of the observed optical spectra based on the Fano resonance between the electromagnetic waves, which have undergone Bragg reflection and dispersion by silver dendrite fractal structure.

Novel nanocomposite materials have been prepared by electro-thermo-diffusion of silver in opal matrix. Optical and electrical properties of these opal-based nanocomposites have been investigated. Interpretation of the observed optical spectra has been made on the basis of the Bragg diffraction and the Fano resonance.

Opal-based nanocomposite with iodide nanoparticles (I / opal) prepared by vapour phase adsorption technology has been investigated. Sample optical characteristics have been measured by Bragg reflectance spectroscopy and ellipsometry techniques. The results showed enhanced effective refractive index value of I /opal nanocomposite, when compared with that of initial opal matrix.