Reversal of transmission and reflection based on acoustic metagratings with integer parity design

Yangyang Fu, Chen Shen, Yanyan Cao, Lei Gao, Huanyang Chen, C. T. Chan (), Steven A. Cummer () and Yadong Xu ()
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Yangyang Fu: Soochow University
Chen Shen: Duke University
Yanyan Cao: Soochow University
Lei Gao: Soochow University
Huanyang Chen: Xiamen University
C. T. Chan: Hong Kong University of Science and Technology, Clear Water Bay
Steven A. Cummer: Duke University
Yadong Xu: Soochow University

Nature Communications, 2019, vol. 10, issue 1, 1-8

Abstract: Abstract Phase gradient metagratings (PGMs) have provided unprecedented opportunities for wavefront manipulation. However, this approach suffers from fundamental limits on conversion efficiency; in some cases, higher order diffraction caused by the periodicity can be observed distinctly, while the working mechanism still is not fully understood, especially in refractive-type metagratings. Here we show, analytically and experimentally, a refractive-type metagrating which can enable anomalous reflection and refraction with almost unity efficiency over a wide incident range. A simple physical picture is presented to reveal the underlying diffraction mechanism. Interestingly, it is found that the anomalous transmission and reflection through higher order diffraction can be completely reversed by changing the integer parity of the PGM design, and such phenomenon is very robust. Two refractive acoustic metagratings are designed and fabricated based on this principle and the experimental results verify the theory.

Date: 2019
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DOI: 10.1038/s41467-019-10377-9

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