期刊
APPLIED PHYSICS LETTERS
卷 106, 期 6, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4908117
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资金
- National Basic Research Program of China [2012CB921504]
- Natural Science Foundation of China [11404147, 11347219]
- Natural Science Foundation of Jiangsu Province [BK20140519]
- Research Fund for Advanced Talents of Jiangsu University [13JDG106]
- Practice Innovation Training Program Projects for Jiangsu College Students [201410299030Z]
- Practice Innovation Training Program Projects for Industrial Center of Jiangsu University
We report an exotic acoustic focusing effect through a simple brass circular ring structure immersed in water. The acoustic waves can be focused on a prefect point at the centre of the ring structure. This exotic acoustic focusing phenomenon arises from the intrinsic modes in the ring structure at some special eigenfrequencies, which is essentially distinct from the previous studies originating from the negative refraction. The focusing effect is closely related to the size and shape of the ring structure. Interesting applications of the focusing mechanism in black box detectors in the sea and medical ultrasound treatment are further discussed. (C) 2015 AIP Publishing LLC.
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