G. Behme et T. Hesjedal, Simultaneous bimodal surface acoustic-wave velocity measurement by scanning acoustic force microscopy, APPL PHYS L, 77(5), 2000, pp. 759-761
We present scanning acoustic force microscopy (SAFM) mixing experiments of
differently polarized surface acoustic waves (SAW) with noncollinear propag
ation directions. The phase velocities of the SAWs are measured at a submic
ron lateral scale, employing a multimode SAFM that is capable of detecting
the wave's normal and in-plane oscillation components. Hereby, the down con
version of the surface oscillations into cantilever vibrations due to the n
onlinearity of the tip-sample interaction is utilized. The simultaneous det
ermination of the phase velocities within a microscopic sample area is demo
nstrated for the mixing of Rayleigh and Love waves on the layered system Si
O2/ST-cut quartz. (C) 2000 American Institute of Physics. [S0003-6951(00)01
831-3].