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(Color online) Top: Calculated acoustic reflectivity as a function of phonon energy (left) and square of phonon displacement along the growth axis as a function of the distance into the mirror (right) for phonon mirrors consisting of a superlattice of (001)-oriented layers repeated ten times. Bottom: Calculated acoustic reflectivity as a function of phonon energy (left) and square of phonon displacement along the growth axis as a function of the distance from the surface of the top mirror (right) for acoustic cavities enclosed by the superlattice phonon mirrors with ten repeats shown in the top panel. The increasing curve thicknesses correspond to , , and , respectively. A schematic of the structure for the specific case of is shown.
(Color online) x-ray diffraction scan of a superlattice. Substrate peaks are marked by asterisks (*).
Cross-sectional HRTEM image of a superlattice grown on a (001) substrate.
(Color online) Bottom: Folded acoustic phonon modes measured by uv Raman scattering (E) in comparison with a photoelastic model calculation of the Raman efficiency (T). Top: Folded acoustic phonon dispersion obtained with a continuum Rytov model. The horizontal dashed line indicates the wave vector transferred in the Raman scattering process.
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