  The Bruggeman formalism for the homogenization of particulate composite
materials is used to predict the effective permittivity dyadic of a
two-constituent composite material with one constituent having the ability to
display the Pockels effect. Scenarios wherein the constituent particles are
randomly oriented, oriented spheres, and oriented spheroids are numerically
explored. Thereby, homogenized composite materials (HCMs) are envisaged whose
constitutive parameters may be continuously varied through the application of a
low-frequency (dc) electric field. The greatest degree of control over the HCM
constitutive parameters is achievable when the constituents comprise oriented
and highly aspherical particles and have high electro-optic coefficients.
