資料載入中.....
|
請使用永久網址來引用或連結此文件:
http://ir.ncue.edu.tw/ir/handle/987654321/1579
|
| 題名: | “Ultrasonic and hypersonic phononic crystals ,” |
| 作者: | Khelif, A.,;Hsiao, F. L.;Benchabane, S.;Choujaa, A.;Aoubiza, B.;Laude, V. |
| 貢獻者: | 光電科技研究所 |
| 日期: | 2008
|
| 上傳時間: | 2010-11-10T07:30:51Z
|
| 摘要: | We report on the experimental and theoretical investigation two kinds of acoustic waves in two dimensional phononic crystal: bulk acoustic waves and surface acoustic waves. For bulk acoustic waves, the work focuses on the experimental observation of full acoustic band gaps in a two-dimensional lattice of steel cylinders immersed in water as well as deaf bands that cause strong attenuation in the transmission for honeycomb and triangular lattices. For surface acoustic waves, complete acoustic band gaps found experimentally in a two-dimensional square-lattice piezoelectric phononic crystal etched in lithium niobate will be presented. Propagation in the phononic crystal is studied by direct generation and detection of surface waves using interdigital transducers. The complete band gap extends from 203 to 226 MHz, in good agreement with theoretical predictions. Near the upper edge of the complete band gap, it is observed that radiation to the bulk of the substrate dominates. This observation is explained by introducing the concept of sound line. |
| 關聯: | Proceedings of SPIE - The International Society for Optical Engineering 6901, art. no. 69010B. |
| 顯示於類別: | [光電科技研究所] 期刊論文
|
在NCUEIR中所有的資料項目都受到原著作權保護.
|
