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Wide-angle asymmetric acoustic absorber based on one-dimensional lossy Bragg stacks
Houyou Long1, Ying Cheng1, Ting Zhang1
1Key Laboratory of Modern Acoustics, Department of Physics and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China dg1622062@smail.nju.edu.cn, chengying@nju.edu.cn, zhangting025@foxmail.com, liuxiaojun@nju.edu.cn.
Abstract:
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° to 42° 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.
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