Abstract
The propagation characteristics of leaky surface acoustic waves (LSAWs) on proton-exchanged 36°-rotated Y-cut LiTaO3 were investigated experimentally. The dependence of the insertion loss between transducer pairs on the proton-exchange depth and the number of finger pairs of the transducer were measured at a frequency of 210 MHz. The insertion loss of the LSAW for the free surface case was improved considerably by the proton exchange because bulk wave radiation from the transducer was suppressed. The change of the amplitude of the mechanical displacement perpendicular to the surface was also measured using a laser probe method.
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