  Spectral peculiarities of the structure consisting of a photonic crystal
coated with a nanocomposite have been investigated. The nanocomposite used
contains spheroidal nanoparticles with a dielectric core and a metallic shell,
which are uniformly dispersed in a transparent matrix. The spectral
manifestation of the observed Tamm plasmon polariton and Fabry--Perot mode has
been examined. A significant polarization sensitivity of the spectra upon
variation in the nanoparticle shape has been demonstrated. The dispersion
curves presented for the Tamm plasmon polariton and Fabry--Perot mode are shown
to be in good agreement with the spectra obtained by the transfer matrix
method.
