Abstract
In crystals lacking a center of inversion, polaritons participate in first order (one polariton) Raman scattering via electric-dipole excitation- and electric field-induced changes in the electric susceptibility. The electric-dipole oscillation and the electric field amplitudes of polaritons can be obtained, simply and directly, from the expression for the energy density of electromagnetic radiation in a dispersive dielectric medium and the relation between the electric-dipole oscillation and electric field amplitudes, which is obtained from the equations of motion. The magnitudes of the macroscopic electric field and the atomic displacement amplitudes of coupled plasmon-LO phonon modes are shown to be the same as the corresponding quantities of the coupled photon-TO phonon polariton modes having the same frequency.
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