Anomalous refraction of airborne sound through ultrathin metasurfaces.
Anomalous refraction of airborne sound through ultrathin metasurfaces.
复制标题
空气中声音通过超薄超表面的异常折射
DOI:
10.1038/srep06517
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发表时间:
2014-10-01
影响因子:
4.6
通讯作者:
Liu Z
中科院分区:
文献类型:
--
作者:
Tang K;Qiu C;Ke M;Lu J;Ye Y;Liu Z
Similar to their optic counterparts, acoustic components are anticipated to flexibly tailor the propagation of sound. However, the practical applications, e.g. for audible sound with large wavelengths, are frequently hampered by the issue of device thickness. Here we present an effective design of metasurface structures that can deflect the transmitted airborne sound in an anomalous way. This flat lens, made of spatially varied coiling-slit subunits, has a thickness of deep subwavelength. By elaborately optimizing its microstructures, the proposed lens exhibits high performance in steering sound wavefronts. Good agreement has been demonstrated experimentally by a sample around the frequency 2.55 kHz, incident with a Gaussian beam at normal or oblique incidence. This study may open new avenues for numerous daily life applications, such as controlling indoor sound effects by decorating rooms with light metasurface walls.
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影响因子:
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