CALCULATION OF RAMAN-SCATTERING BY ACOUSTIC PHONONS IN SUPERLATTICES

We report on the calculation of low-frequency Raman scattering by long itudinal acoustic phonons in superlattices. The phonons are treated as elastic waves propagating in a continuum and their mode patterns are calculated by a transfer-matrix method. The electromagnetic propagatio n is calculated neglecting reflections and refractions at the interfac es, through the use of the same index of refraction for both constitue nt materials. The use of a complex refraction index allows for absorpt ion effects to be included. The suitability of the numerical calculati on for modeling superlattices is demonstrated.