We report on a surface-bulk hybrid acoustic mode, which exists within a limited frequency interval in some piezoelectric substrates within a periodic metal grating. These hybrid modes result from the coupling between a bulk wave and a counter-propagating surface (or leaky) wave. An example of such a hybrid mode, which propagates in 36°-YX cut of lithium tantalate, is described. The hybrid mode gives rise to an additional branch of dispersion relation. The Bragg reflection stop band occurs due to phase match between surface and bulk waves. The lower edge of this stop band manifests itself by a resonance of harmonic admittance, being a reason of undesired resonances in resonator filters.
REFERENCES
1.
2.
Y. Fusero, S. Ballandras, J. Desbois, J. M. Hode, and P. Ventura, Proceedings of the 2000 IEEE Ultrasonics Symposium, San Juan (IEEE, New York, 2000), pp. 163–166.
3.
K.
Blotekjaer
, K. A.
Ingebrigtsen
, and H.
Skeie
, IEEE Trans. Electron Devices
20
, 1133
(1973
).4.
K.
Blotekjaer
, K. A.
Ingebrigtsen
, and H.
Skeie
, IEEE Trans. Electron Devices
20
, 1139
(1973
).5.
Y.
Zhang
, J.
Desbois
, and L.
Boyer
, IEEE Trans. Sonics Ultrason.
40
, 183
(1993
).6.
P. Ventura, J. M. Hode, M. Solal, J. Desbois, and J. Ribbe, Proceedings of the 1998 IEEE Ultrasonics Symposium, Sendai (IEEE, New York, 1998), pp. 175–186.
7.
G.
Endoh
, K.
Hashimoto
, and M.
Yamaguchi
, Jpn. J. Appl. Phys., Part 1
34
, 2638
(1995
).8.
E. L.
Adler
, IEEE Trans. Ultrason. Ferroelectr. Freq. Control
41
, 876
(1994
).
This content is only available via PDF.
© 2002 American Institute of Physics.
2002
American Institute of Physics
You do not currently have access to this content.
