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- W2080378637 abstract "An important unsettled question exists whether high-frequency (gigahertz to terahertz) acoustic phonons undergo specular or diffuse scattering from a crystal boundary. In this Letter, we demonstrate a phonon-imaging method which clearly differentiates between these two processes. For optically polished sapphire (${mathrm{Al}}_{2}$${mathrm{O}}_{3}$) at 1.6 K, we observe sharp singularity patterns which are unambiguously identified with specular reflection. For a degraded surface, a broad spatial pattern associated with diffuse scattering is observed. A theoretical basis for phonon reflection imaging is presented." @default.
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- W2080378637 date "1984-06-11" @default.
- W2080378637 modified "2023-10-17" @default.
- W2080378637 title "Phonon Reflection Imaging: A Determination of Specular versus Diffuse Boundary Scattering" @default.
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- W2080378637 doi "https://doi.org/10.1103/physrevlett.52.2156" @default.
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