Surface and Interface Acoustic Phonons in Aluminium-Coated Silicon
Measurements are presented of the Brillouin cross-section for a thin aluminium film on a silicon substrate measured using a tandem multipass interferometer. The measured spectra are compared with the cross-section computed by assuming that the light is inelastically scattered from the surface corrugation due to the thermally excited acoustic phonons. By varying the thickness of the aluminium film we observe different spectral features such as the modified Rayleigh mode, the Sezawa modes and the continuum of states of the substrate. The limiting case of a thick coating is also discussed.
KeywordsSpectral Function Rayleigh Wave Mixed Mode Acoustic Phonon Thick Coating
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