Reversal Phenomenon in Phase Velocity of Surface Acoustic Waves on Free and Metallized Surfaces by Proton-Exchange

概要

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An interesting phenomenon, in the case of the phase velocity of surface acoustic waves propagating on a proton-exchantged substrate, was observed experimentally. The phase velocity on proton-exchanged 128° Y-X LiNbO_3 was measured as a function of the exchange depth using parallel comb filters. Unlike the ordinary dispersive phase velocity for the free surface case, the phase velocity for the case of the metallized surface maintained a constant value when the exchange depth was greater than a certain value. In this region, a reversal phenomenon was observed, indicating that the phase velocity in the cause of the metallized surface became faster than that in the case of the free surface. This phenomenon is probably caused by the mode conversion of the Rayleigh wave to some other mode in the metallized surface.
社団法人応用物理学会の論文
1999-05-30