The electromechanical coupling coefficient K for surface acoustic waves (SAWs) in proton-exchanged Z-cut X-propagation lithium niobate has been experimentally investigated by the method of evaporating a thin metal film and measuring in situ the SAW attenuation. The enhancement in value by as much as two times caused by the proton exchange has been observed. It is attributed to the redistribution of electric potential of the acoustic wave due to formation of a layer at the surface. The change of electromechanical coupling coefficient in samples fabricated under different conditions depends on the acoustic wavelength–layer thickness product The value attains a maximum of about at whereas it is equal to in nonexchanged lithium niobate. The increase in electromechanical coupling coefficient can be applied for enhancement of the SAW interdigital transducer efficiency.
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Research Article| January 24 2000
Enhancement of electromechanical coupling coefficient by proton exchange in Z-cut
Yu. N. Korkishko;
D. Čiplys, R. Rimeika, Yu. N. Korkishko, V. A. Fedorov; Enhancement of electromechanical coupling coefficient by proton exchange in Z-cut . Appl. Phys. Lett. 24 January 2000; 76 (4): 433–435. https://doi.org/10.1063/1.125778
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