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- W2053368950 abstract "We present a summarizing overview of our recent experiments using the ballistic phonon signal generated by low temperature scanning electron microscopy for imaging defect structures and the anisotropic elastic properties (phonon-focusing effect) in single-crystal materials. Extensive studies have been performed with dielectric crystals (sapphire and α-quartz) and semiconductors (GaAs, silicon and germanium). With a single phonon detector of small area (superconducting bolometers of size between 2 μm × 2 μm and 10 μm × 10 μm), we have obtained two-dimensional images with a lateral resolution reaching about 5 μm. Using superconducting tunnel junctions as frequency-selective phonon detectors, dispersive effects in the ballistic phonon propagation have been observed. The application of more than one phonon detector placed at different locations allows stereoscopic observations and yields information on the defect structure in all three dimensions. Using computer-controlled electron beam scanning and digital data processing, techniques for contrast enhancement in the three-dimensional acoustic imaging of defect structures have been developed. A three-dimensional acoustic tomography principle based on the ballistic phonon signal in combination with a detector array is outlined. Our present experiments indicate that a spatial resolution of about 20 μm in all three dimensions can be achieved with this acoustic imaging principle." @default.
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- W2053368950 date "1990-01-01" @default.
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- W2053368950 title "Ballistic phonon signal for imaging crystal properties" @default.
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- W2053368950 doi "https://doi.org/10.1016/0921-5107(90)90048-g" @default.
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