Electromagnetic energy exchange phenomena is presented. The rate equations derived from the particle balance are consistent with Maxwell's equations and the group velocity appears in the travelling-field equations.The parameter χ is called the susceptibility with l+χ=ε_r giving the relative permittivity. In electro-optic material, it is more correcdy considered as a tensor so that the polarisation is not necessarily in exactly the same direction as the applied field, but in this work it is adequate to treat χ as a scalar. The random polarisation P_spont gives rise to spontaneous polarisation currents.

Inspec keywords: wave functions; Maxwell equations; dielectric polarisation; permittivity; electro-optical effects; optical susceptibility; optical materials; electromagnetic fields

Other keywords: dielectric spontaneous polarisation; electro-optic material; electromagnetic energy exchange; travelling-field equations; wave functions; permittivity; optical susceptibility; Maxwell equations; group velocity

Subjects: Other optical materials