Ballistic Phonon Imaging in Solids—A New Look at Phonon Focusing
- 5 November 1979
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 43 (19) , 1424-1427
- https://doi.org/10.1103/physrevlett.43.1424
Abstract
A technique is described which graphically displays the anisotropic propagation of non-equilibrium phonons in crystals at low temperatures. Ballistic phonons emanating from a localized heat pulse are channeled preferentially along various crystal directions due to elastic anisotropies. A spatial map of phonon intensities in Ge is collected by continuous scanning over the propagation directions. The data have precipitated a new approach to analyzing the theory of phonon focusing in solids.Keywords
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