期刊
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
卷 142, 期 1, 页码 EL69-EL74出版社
ACOUSTICAL SOC AMER AMER INST PHYSICS
DOI: 10.1121/1.4991677
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资金
- National Basic Research Program of China [2017YFA0303700]
- NSFC [11674172, 11574148, 11474162]
- Jiangsu Provincial NSF [BK20160018]
- Fundamental Research Funds for the Central Universities [020414380001, 020414380053]
Based on one-dimensional lossy Bragg stacks, an asymmetric absorber is realized for low-frequency sound waves, that is, perfect absorption can be obtained when sound waves are normally incident from one side while a small absorption can be obtained from the opposite side. Moreover, the asymmetric absorption persists for a wide incident angle of sound waves in the range from 0 degrees to 42 degrees with the absorptive coefficient larger than 90% from one side while less than 20% from the other side. By changing the thickness of the top sublayer, a series of interesting absorption phenomena such as Fano-resonance type absorption are further investigated. (C) 2017 Acoustical Society of America
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