期刊
SCIENTIFIC REPORTS
卷 9, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41598-019-48215-z
关键词
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资金
- National Natural Science Foundation of China [11274120, 11574087]
- King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) [OSR-2016-CRG5-2950, BAS/1/1626-01-01]
Acoustic source emission rate is generally low at low frequencies. In this work, we propose a simple design of 'LEGO'-type acoustic metamaterial that can significantly enhance the low frequency emission rate of an acoustic monopole source. Such enhancement is resulted from the coupling between resonances of a cavity and a dual grating comprised of two concentric layers of periodically distributed narrow slits. We develop an effective medium model to characterize the enhancement. Because of its simple structure, the metamaterial is easy to fabricate and thus facilitates the applications in various domains such as oil exploration.
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