Surface and interface acoustic waves in SiO2/YX-LiNbO3

For Y-cut lithium niobate, a leaky shear-horizontal (SH) surface wave is known to propagate along the X axis. When an SiO2 film is deposited on the LiNbO3 surface, the SH wave is found experimentally to have low loss, and theoretical calculations show the wave to be closely confined to the surface....

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Veröffentlicht in:	Applied physics letters 1984-01, Vol.44 (2), p.182-184
Hauptverfasser:	CULLEN, D, MELTZ, G, GRUDHKOWSKI, T
Format:	Artikel
Sprache:	eng
Schlagworte:	Condensed matter: structure, mechanical and thermal properties Exact sciences and technology Mechanical and acoustical properties adhesion Physics Solid surfaces and solid-solid interfaces Solid-fluid interfaces Surfaces and interfaces thin films and whiskers (structure and nonelectronic properties)
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Beschreibung
Zusammenfassung:	For Y-cut lithium niobate, a leaky shear-horizontal (SH) surface wave is known to propagate along the X axis. When an SiO2 film is deposited on the LiNbO3 surface, the SH wave is found experimentally to have low loss, and theoretical calculations show the wave to be closely confined to the surface. Two additional acoustic modes are observed in the SiO2/YX-LiNbO3 configuration. One mode is a Rayleigh-type surface wave and the other a generalized Stoneley wave. Experimental measurements and theoretical predictions of the wave velocities versus film-thickness to wavelength ratio (h/lambda) are presented. Measurements of the temperature coefficient of time delay are given for the SH wave, showing a zero first-order coefficient at h = 0.42 x lambda. The sensitivity of this wave to bending strains is also presented.
ISSN:	0003-6951 1077-3118
DOI:	10.1063/1.94701