科研之友
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摘要
We report the realization of acoustic collimating beams by a two-dimensional phononic crystal, which has a negative effective refractive index of small magnitude. The radiation far field of a point source through the phononic crystal with a divergence angle of about 5 degrees is obtained. The measured intensity field distribution in experiment further confirms this collimating property.
- 出版日期2009-6-1
- 单位武汉大学; 黄淮学院
