T. Hesjedal et G. Behme, High-resolution imaging of a single circular surface acoustic wave source:Effects of crystal anisotropy, APPL PHYS L, 79(7), 2001, pp. 1054-1056
We present an experimental method for the high-resolution imaging of the ex
citation and propagation of surface acoustic waves (SAWs) on anisotropic pi
ezoelectric substrates. By employing a scanning acoustic force microscope (
SAFM), we are able to image acoustic waves that are excitable by a single c
ircular electrode pair source through the mixing with well-defined referenc
e plane waves. We show amplitude and phase images of the point-source wave
field, containing the angular dependence of the phase velocity of these mod
es, as well as their electromechanical coupling strength. The SAFM allows e
asy access to acoustic material properties, which are important for the des
ign of commercial SAW devices. (C) 2001 American Institute of Physics.