Abstract
The optical reflection and transmission spectra of thin three-dimensional opal-like photonic crystal films are studied. The spectra are calculated numerically making use of the analytical theory of dynamical diffraction generalized to the case of a spatially periodic medium with high dielectric contrast. The kinematic conditions for light diffraction are considered from the system of lateral (111) and oblique (11-1) crystal planes taking into account the film interfaces. It is established that the diffraction of light from the oblique planes forms additional extinction bands which do not coincide in their spectral positions with the Bragg reflection peaks for the corresponding oblique planes.
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