| Focusing of Surface Acoustic Wave on a Piezoelectric Crystal |
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| 作者姓名： | 乔东海 汪承灏 王左卿 |
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| 作者单位： | Institute of Acoustics, Chinese Academy of Sciences, Beijing 100080 |
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| 基金项目： | Supported by the National Natural Science Foundation of China under Grant No 10134020. |
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| 摘 要： | We investigate the focusing phenomena of a surface acoustic wave （SAW） field generated by a circular-arc interdigital 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 tield 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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| 关 键 词： | 表面声波聚焦 压电晶体 聚焦现象 SAW场 |
| 收稿时间： | 2006-02-08 |
| 修稿时间： | 2006-02-08 |
Focusing of Surface Acoustic Wave on a Piezoelectric Crystal |
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| QIAO Dong-Hai, WANG Cheng-Hao, WANG Zuo-Qing.Focusing of Surface Acoustic Wave on a Piezoelectric Crystal[J].Chinese Physics Letters,2006,23(7):1834-1837. |
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| Authors: | QIAO Dong-Hai WANG Cheng-Hao WANG Zuo-Qing |
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