Abstract
The generation of ballistic phonons by scanning the surface of a single-crystalline specimen at liquid-He temperatures with a laser or electron beam has been used recently for investigating the phonon focusing effect, i.e., the anisotropic ballistic phonon propagation /1/. The same scanning principle can also serve for imaging structural inhomogeneities in a crystal with ballistic phonons /2/. An object placed between phonon source and detector disturbs the ballistic phonon propagation and influences the detector signal for a distinct coordinate of the scanning beam (see Fig. 1). If two phonon detectors are operated simultaneously, three-dimensional imaging with ballistic phonons becomes possible.
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