The authors introduce an all-optical approach to study the propagation of high frequency acoustic phonons in which the generation and detection involves two spatially separated superlattices similar to 1 mu m apart. Propagating modes of frequencies up to similar to 1 THz escape from the superlattice where they are generated and reach the second superlattice where they are detected and spectrally resolved using pump-probe techniques. The measured frequency spectrum reveals finite size effects, which can be accounted for by a continuum elastic model. (C) 2007 American Institute of Physics.
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