where ε ε 0 is the absolute permittivity of free space and p m is electric dipole moment of a single inclusion induced by the external electric field E. However this equality is good only for homogeneous medium and ε ε d = 1 . Moreover, the formula (1) ignores the interaction between single inclusions. Because of these circumstances, formula (1) gives too narrow and too high resonant curve for plasmon excitations in metal nanoparticles of the mixture.