Journal
NATURE COMMUNICATIONS
Volume 10, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-019-10377-9
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Funding
- National Natural Science Foundation of China [11604229, 11774252, 11874311]
- Natural Science Foundation of Jiangsu Province [BK20161210, BK20171206]
- Multidisciplinary University Research Initiative grant from the Office of Naval Research [N00014-13-1-0631]
- Emerging Frontiers in Research and Innovation grant from the National Science Foundation [1641084]
- China Postdoctoral Science Foundation [2018T110540]
- Hong Kong Research Grants Council [AoE/P-02/12]
- Fundamental Research Funds for the Central Universities [20720170015]
- Nanjing University of Aeronautics and Astronautics
- Collaborative Innovation Center of Suzhou Nano Science and Technology at Soochow University
- 333 project [BRA2015353]
- PAPD of Jiangsu Higher Education Institutions
- Qing Lan project
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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.
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