Abstract
The elementary excitations of quasi-one-dimensional charge density waves (CDW) which couple directly to the electric field are the phasons. Phasons give rise to phason-polaritons when coupled to the electromagnetic field. In finite geometry, surface phason-polaritons appear. We have calculated surface phason-polariton spectra for CDW films for P-polarization and CDW conducting axis inside the film. The f.i.r. surface phason-polariton states are confined to a finite band of longitudinal wave numbers. Besides surface phason-polaritons, infinite series of guided wave modes are found which extend to large wave numbers. At finite temperatures, quasi-particles are thermally excited. Their dissipation leads to polariton damping and to significant level shifts.
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