Abstract
The proton exchange in lithium niobate has become a very popular technique for fabrication of high-quality optical waveguides, which find numerous applications in integrated optics and acoustooptics. Many acoustooptic devices are based on the interaction between surface acoustic waves and guided optical waves. The surface acoustic wave propagation conditions strongly depend on crystal surface properties, which are considerably affected by the proton exchange and post-exchange annealing procedures. The present paper deals with the piezoelectric properties of protonated structures, which differ significantly from those of initial crystals. The results of direct measurements of the electromechanical coupling coefficient using two methods are presented. The first method is based on the comparison of acoustic velocities on a free and metallised surface of the crystal, and the second is based on in situ measurements of acoustic attenuation during evaporation of a thin metal film on the acoustic propagation path. The degradation of piezoelectric properties in a surface layer due to the proton exchange is demonstrated, and they could not be restored by the post-exchange annealing.
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Čiplys, D., Rimeika, R. (2000). Piezoelectric Properties of Proton-Exchanged Optical Waveguides. In: Galassi, C., Dinescu, M., Uchino, K., Sayer, M. (eds) Piezoelectric Materials: Advances in Science, Technology and Applications. NATO Science Series, vol 76. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-4094-2_22
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DOI: https://doi.org/10.1007/978-94-011-4094-2_22
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