Abstract
The role of the quadrupole moment for the interaction of electromagnetic waves with matter is discussed. Using an artificial chiral medium as an example, it is shown that optical activity is not affected by the quadrupole polarization induced by the tensor Q/sub /spl alpha//spl beta//=q/sub /spl alpha//spl gamma//spl beta///sup (0)/E/sub /spl beta//. Also it is demonstrated by the example of the simplest composite material (a dielectric matrix loaded with dielectric spheres) that the quadrupole response may be represented as Q/sub /spl alpha//spl gamma//=q/sub /spl alpha//spl gamma//spl beta//spl delta///sup (1)//spl nabla//sub /spl delta//E/sub /spl beta//. The latter form leads to the change of birefringence parameters only.
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