期刊
ADVANCED MATERIALS
卷 31, 期 49, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201904682
关键词
deep-subwavelength acoustic imaging; phononic crystals; second-order topological insulators; spoof surface acoustic waves; topological corner states
类别
资金
- National Key R&D Program of China [2017YFA0303702]
- NSFC [11922407, 11834008, 11874215, 11674172, 11574148]
- Jiangsu Provincial NSF [BK20160018]
- Fundamental Research Funds for the Central Universities [020414380001]
- Nanjing University Innovation and Creative Program [CXCY17-11]
- China Scholarship Council
- European Research Council (ERC) [714577 PHONOMETA]
- MINECO through a Ramon y Cajal grant [RYC-2015-17156]
Higher-order topological insulators (HOTIs) belong to a new class of materials with unusual topological phases. They have garnered considerable attention due to their capabilities in confining energy at the hinges and corners, which is entirely protected by the topology, and have thus become attractive structures for acoustic wave studies and control. However, for most practical applications at audible and low frequencies, compact and subwavelength implementations are desirable in addition to providing robust guiding of sound beyond a single-frequency operation. Here, a holey HOTI capable of sustaining deeply confined corner states 50 times smaller than the wavelength is proposed. A remarkable resilience of these surface-confined acoustic states against defects is experimentally observed, and topologically protected sound is demonstrated in three different frequency regimes. Concerning this matter, the findings will thus have the capability to push forward exciting applications for robust acoustic imaging way beyond the diffraction limit.
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