Abstract
Narrow, movable coherent phonon beams are excited and detected piezoelectrically in the GHz-range by using a modified re-entrant type of coaxial resonator. Longitudinal as well as transverse phonon pulses are generated simultaneously. The diameter of the phonon beams are measured and show a diameter less than 1 mm. The phonon beams can be displaced easily in lateral direction through a large crystal by a relative motion of crystal and reentrant cavity.
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Ulrich, H., Weis, O. Excitation and detection of narrow, movable hypersound beams in the GHz-range. Z Physik B 29, 185–187 (1978). https://doi.org/10.1007/BF01321180
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DOI: https://doi.org/10.1007/BF01321180