The emission spectra of opal photonic crystals loaded with silver nanoparticles have been measured under UV excitation. The spectra are found to markedly differ from the spectrum of plain (uninfiltrated) opal: silver nanoparticles give rise to an extra, long-wavelength emission band and change the shape of the spectrum. We have calculated the dispersion laws for the two lower photon branches and the corresponding dependences of the refractive index on frequency for the plain and silver-infiltrated photonic crystals.
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Горелик et al. (2008) studied this question.
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