Appendix 5: Electromagnetic energy exchange
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=εr 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 Pspont gives rise to spontaneous polarisation currents.
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Appendix 5: Electromagnetic energy exchange, Page 1 of 2
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