Anomalous refraction of airborne sound through ultrathin metasurfaces

Kun Tang, Chunyin Qiu, Manzhu Ke, Jiuyang Lu, Yangtao Ye, Zhengyou Liu

Research output: Contribution to journalArticlepeer-review

320 Scopus citations

Abstract

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.

Original languageEnglish
Article number6517
JournalScientific Reports
Volume4
DOIs
StatePublished - 1 Oct 2014
Externally publishedYes

Bibliographical note

Funding Information:
This work is supported by the National Natural Science Foundation of China (Grant Nos. 11174225, 11004155, 11374233, and J1210061); the National Basic Research Program of China (Grant No. 2015CB755500); the Open Foundation from State Key Laboratory of Applied Optics of China; and the Program for New Century Excellent Talents (NCET-11-0398).

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