Acoustic loss mechanisms in leaky SAW resonators on lithium tantalate
- Resource Type
- Periodical
- Authors
- Koskela, J.; Knuuttila, J.V.; Makkonen, T.; Plessky, V.P.; Salomaa, M.M.
- Source
- IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control IEEE Trans. Ultrason., Ferroelect., Freq. Contr. Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on. 48(6):1517-1526 Nov, 2001
- Subject
- Fields, Waves and Electromagnetics
Surface acoustic waves
Acoustic waves
Lithium compounds
Laser modes
Laser theory
Probes
Acoustic measurements
Laser excitation
Resonance
Frequency
- Language
- ISSN
- 0885-3010
1525-8955
Discusses acoustic losses in synchronous leaky surface acoustic wave (LSAW) resonators on rotated Y-cut lithium tantalate (LiTaO/sub 3/) substrates. Laser probe measurements and theoretical models are employed to identify and characterize the radiation of leaky waves into the busbars of the resonator and the excitation of bulk acoustic waves. Escaping LSAWs lead to a significant increase in the conductance, typically occurring in the vicinity of the resonance and in the stopband, but they do not explain the experimentally observed deterioration of the electrical response at the antiresonance. At frequencies above the stopband, the generation of fast shear bulk acoustic waves is the dominant loss mechanism.