Light-sensitive Rayleigh-wave generation by surface piezoelectricity

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Abstract
A simple method is described for generation and detection of surface waves in nonpiezoelectric dielectrics due to creation of a space‐charge region and a polarized surface layer under the interdigital electrodes. By direct evaporation of electrodes onto the surface of nonpiezoelectric materials, and without use of dc bias, Rayleigh waves with a signal‐to‐noise ratio as high as 60 dB have been generated. We have demonstrated the method on cubic KTaO3 and cubic BaTiO3. Additional application of dc bias further enhances the signal which is retained even after removal of the bias. High sensitivity to band‐gap illumination is observed, allowing a direct determination of the band gap.

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