Bulk waves radiated from an interdigital metallic transducer deposited on an anisotropic substrate

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Bulk waves radiated from an interdigital metallic transducer deposited on an anisotropic substrate

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© The Institution of Electrical Engineers
Published

The whole acoustic field emanating from a metallic interdigital transducer (IDT) deposited on an anisotropic half-space is computed. Extending the classical Lamb approach, it is shown that the field can be expressed by an integral whose singularities give rise to both Rayleigh surfaces waves (SAWs) and well collimated bulk waves (BAWs). For a Y-cut, Z-propagation quartz crystal a horizontal shear wave is excited; it is shown that the orientation and width of the main lobe can be chosen by changing the frequency.

Inspec keywords: ultrasonic transducers; surface acoustic waves; ultrasonic propagation

Other keywords: IDT; BAW; anisotropic half-space; interdigital metallic transducer; main lobe orientation; anisotropic substrate; whole acoustic field; main lobe width; singularities; Z-propagation quartz crystal; SAW; Y-cut; metallic interdigital transducer; horizontal shear wave; collimated bulk waves; integral; frequency dependence; Rayleigh surfaces waves; classical Lamb approach

Subjects: Ultrasonics, quantum acoustics, and physical effects of sound; Sonic and ultrasonic transducers; Acoustic wave devices

References

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      • Lewis, M.F.: `Surface skimming bulk waves, SSBW', Proceedings of ultrasonics symposium, 1977, Arizona, Phoenix, p. 744–752.
    2. 2)
      • M.A. Goodberlet , D.L. Lee . The excitation and detection of surface-generated bulk waves. IEEE Trans. , 67 - 76
    3. 3)
      • R.F. Milson , N.H.C. Reilly , M. Redwood . Analysis of generation and detection of surface and bulk acoustic waves by interdigital transducers. IEEE Trans. , 147 - 166
    4. 4)
      • H. Lamb . On the propagation of tremors over the surface of an elastic solid. Philos. Trans. R. Soc. London A , 1 - 42
    5. 5)
      • M. Planat , P. Schiavone . Efficiency of surface interdigital transducers on anisotropic media. J. Appl. Phys. , 49 - 52
    6. 6)
      • K. Yashiro , N. Goto . Analysis of generation of acoustic waves on the surface of a semi-infinite piezoelectric solid. IEEE Trans. , 146 - 153
    7. 7)
      • H. Jeffreys , B.S. Jeffreys . (1962) , Methods of mathematical physics.
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