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Dynamic susceptibilities (Green's functions) of the interacting electromagnetic waves G” e (ω) and optical phonons G” u (ω) in a medium with zero-mean inhomogeneous coupling parameter have been considered. The calculation was performed using a self-consistent approximation for the two stochastically interacting wave fields. It is shown that on the tops of the resonance maxima of the imaginary parts of the Green functions the fine structure is formed: a minimum (dip) on the top of G” e (ω) and narrow maximum (peak) on the top of G” u (ω). With increasing the correlation wavenumber of inhomogeneities k c (i.e., with decreasing the size of inhomogeneities), the width of the peak on G” u (ω) decreases, and two resonance maxima in the function G” e (ω) are formed. Because of the large difference in the speeds of light and optical phonons, the fine structure of the polaritons is manifested itself more clearly and saved to a much larger values of k c , than for the studied earlier crossing resonance of spin and elastic waves.

Green's Functions of Polaritons in a Medium with Zero-mean Inhomogeneous Coupling Parameter