Effect of an electric field on the propagation of surface acoustic waves in weakly coupled (delta-v)/v waveguides

The effects of applying a voltage between two weakly coupled (delta-v)/v waveguides on the propagation of surface acoustic waves (SAW) in them is studied experimentally. Substantial redistribution of the SAW energy between the two waveguides was observed, which is ascribed to the difference in phase velocities in the waveguides. It was also found that the voltage caused a change in SAW propagation time; this effect can be used to control the phase of signals, to tune the frequencies of oscillators with a SAW delay line in a feedback circuit, and to develop acoustoelectronic voltmeters.