Existence of the branch of fast surface acoustic waves on piezoelectric substrates

✍ Scribed by A.N. Darinskii; M. Weihnacht

• Publisher: Elsevier Science
• Year: 2002
• Tongue: English
• Weight: 182 KB
• Volume: 36
• Category: Article
• ISSN: 0165-2125
• DOI: 10.1016/s0165-2125(02)00010-0

✦ Synopsis

The paper discusses the existence of non-attenuating surface acoustic waves (SAWs) propagating on piezoelectric substrates of arbitrary anisotropy with the velocity exceeding that of the transverse bulk waves. Such fast SAW appears at specially selected orientations of the substrate. As applied to SAWs traveling faster than the slowest bulk wave, it has been shown that the set of orientations supporting this SAWs can be represented as a line in the three-dimensional space of orientation angles. As an example, a comprehensive numerical study of the line, or branch, of fast SAW in LiNbO 3 has been performed. At the same time it has been shown that the appearance of SAWs with the velocity exceeding that of both the transverse bulk waves in a general manner is a fairly rare event and strongly connected with the symmetry of the substrate. Also, the resonance reflection of bulk waves near leaky wave branches is briefly considered.