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Focusing of Surface Acoustic Wave on a Piezoelectric Crystal |
| QIAO Dong-Hai;WANG Cheng-Hao;WANG Zuo-Qing |
| Institute of Acoustics, Chinese Academy of Sciences, Beijing 100080 |
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| Cite this article: |
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QIAO Dong-Hai, WANG Cheng-Hao, WANG Zuo-Qing 2006 Chin. Phys. Lett. 23 1834-1837 |
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Abstract We investigate the focusing phenomena of a surface acoustic wave (SAW) field generated by a circular-arc inter-digital transducer (IDT) on a piezoelectric crystal. A rigorous vector field theory of surface excitation on the crystal we developed previously is used to evaluate the convergent SAW field instead of the prevalent scalar angular spectrum used in optics. The theoretical results show that the anisotropy of a medium has great impact on the focusing properties of the acoustic beams, such as focal length and symmetrical distributions near the focus. A dark field method is used in experiment to observe the focusing of the SAW field optically. Although the convergent phenomena of SAW field on the anisotropic media or piezoelectric crystals are very complicated, the experimental data are in agreement with those from the rigorous theory.
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| Keywords:
43.20.+g
43.35.Pt
43.38.Rh
77.65.Dq
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Published: 01 July 2006
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| PACS: |
43.20.+g
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(General linear acoustics)
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43.35.Pt
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(Surface waves in solids and liquids)
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43.38.Rh
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(Surface acoustic wave transducers)
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77.65.Dq
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(Acoustoelectric effects and surface acoustic waves (SAW) in piezoelectrics)
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