Spatiotemporal mapping of surface acoustic waves in isotropic and anisotropic materials

Y Sugawara; O B Wright; O Matsuda; V E Gusev

doi:10.1016/s0041-624x(02)00090-2

Spatiotemporal mapping of surface acoustic waves in isotropic and anisotropic materials

Ultrasonics. 2002 May;40(1-8):55-9. doi: 10.1016/s0041-624x(02)00090-2.

Authors

Y Sugawara¹, O B Wright, O Matsuda, V E Gusev

Affiliation

¹ Department of Applied Physics, Faculty of Engineering, Hokkaido University, Sapporo, Japan. assp@kino-ap.eng.hokudai.ac.jp

PMID: 12160000
DOI: 10.1016/s0041-624x(02)00090-2

Abstract

We demonstrate a new method for a real-time imaging of surface acoustic waves at frequencies up to 1 GHz with picosecond temporal and micron spatial resolutions using an ultrafast optical pump and probe technique combined with a common path interferometer. Using samples with isotropic or anisotropic substrates coated with metallic thin films, we observe the propagation of Rayleigh-like modes and surface-skimming bulk modes as well as resolving surface phonon focusing effects. In addition we image surface acoustic wave propagation in a laterally inhomogeneous sample.