Abstract
AbstractA theoretical and experimental study has been conducted on the nonlinear interaction of a surface acoustic wave (SAW) on a surface acoustic waveguide. It is shown theoretically and experimentally that from the parametric mixing phenomenon of two SAW's traveling in the opposite directions, a SAW with the sum frequency is generated which propagates with a certain angle from the waveguide. By changing the frequency difference, the propagation direction of the sum frequency SAW can be controlled freely. the excitation efficiency is such that: (1) it is higher for a narrow waveguide and for a larger velocity variation; and (2) it is periodic with respect to the waveguide width and the period is one wavelength of the sum frequency SAW. Such a generation of the sum frequency SAW and the SAW beam scanning in a plane are possible only with the SAW guided mode. Since the control of the SAW propagation direction in a plane is possible, an application to a two‐dimensional signal processing is conceivable.
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