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We report on confined exciton resonances of acoustic and folded acousticphonon light scattering in a GaAs/AlAs multi-quantum-well. Significantvariations of the line shifts and widths are observed across the resonance andquantitatively reproduced in terms of the polariton dispersion. This highresolution Brillouin study brings new unexpectedly detailed informations on thepolariton dynamics in confined systems.

Dispersion and damping of multi-quantum well polaritons from resonant Brillouin scattering by folded acoustic modes