Internal diffraction of ultrasound in crystals: Phonon focusing at long wavelengths

Matt R. Hauser, R. L. Weaver, J. P. Wolfe

Research output: Contribution to journalArticlepeer-review

Abstract

We have obtained images of acoustic energy flux in anisotropic media by an ultrasonic analog to ballistic-phonon imaging. The observed flux reveals a phonon-focusing pattern modulated by interference fringes, in accord with prior theoretical predictions. While phonon imaging is largely restricted to insulators at low temperatures, the ultrasonic technique works at ambient temperatures and is also applicable to metals and even noncrystalline anisotropic materials.

Original languageEnglish (US)
Pages (from-to)2604-2607
Number of pages4
JournalPhysical review letters
Volume68
Issue number17
DOIs
StatePublished - 1992

ASJC Scopus subject areas

  • General Physics and Astronomy

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