The focusing of surface acoustic waves launched from a slanted chirped transducer. II. Anisotropic substrate

For pt.I see ibid., vol.UFFC-36, p.565-73 (1989). A characteristic feature of a slanted chirp transducer (SCT) with fingers only a few wavelengths long is that waves launched from it tend to a focus. Analytical expressions for key features of the radiation field are obtained for a linear chirp SCT o...

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Bibliographic Details
Published in:IEEE transactions on ultrasonics, ferroelectrics, and frequency control ferroelectrics, and frequency control, 1990-05, Vol.37 (3), p.265-273
Main Authors: Lancaster, M.J., Paige, E.G.S.
Format: Article
Language:English
Subjects:
Acoustic transducers
Acoustic wave devices, piezoelectric and piezoresistive devices
Acoustic waves
Anisotropic magnetoresistance
Applied sciences
Chirp
Electronics
Exact sciences and technology
Fingers
Frequency
Lenses
Lithium
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Surface acoustic waves
Surface waves
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Summary:For pt.I see ibid., vol.UFFC-36, p.565-73 (1989). A characteristic feature of a slanted chirp transducer (SCT) with fingers only a few wavelengths long is that waves launched from it tend to a focus. Analytical expressions for key features of the radiation field are obtained for a linear chirp SCT on an anisotropic substrate and validated by comparison with experimental results obtained on Y-cut lithium niobate. It is found that anisotropy of velocity introduces cusps into the radiation field, giving the focal region properties comparable to those at the focus of a simple lens. Selection of the cuspoidal region combined with choice of finger length is shown to form the basis of a method of apodization.< >
ISSN:0885-3010
1525-8955
DOI:10.1109/58.55317