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arXiv · 1708.07100

High-efficiency and full-space manipulation of electromagnetic wave-fronts with metasurfaces

Tong Cai·GuangMing Wang·ShiWei Tang·HeXiu Xu·JingWen Duan·HuiJie Guo·FuXin Guan·ShuLin Sun·Qiong He·Lei Zhou
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Abstract

Metasurfaces offered great opportunities to control electromagnetic (EM) waves, but currently available meta-devices typically work either in pure reflection or pure transmission mode, leaving half of EM space completely unexplored. Here, we propose a new type of metasurface, composed by specifically designed meta-atoms with polarization-dependent transmission and reflection properties, to efficiently manipulate EM waves in the full space. As a proof of concept, three microwave meta-devices are designed, fabricated and experimentally characterized. The first two can bend or focus EM waves at different sides (i.e., transmission/reflection sides) of the metasurfaces depending on the incident polarization, while the third one changes from a wave bender for reflected wave to a focusing lens for transmitted wave as the excitation polarization is rotated, with all these functionalities exhibiting very high efficiencies (in the range of 85%-91%). Our findings significantly expand the capabilities of metasurfaces in controlling EM waves, and can stimulate high-performance multi-functional meta-devices facing more challenging and diversified application demands.

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Tong Cai, GuangMing Wang, ShiWei Tang, HeXiu Xu, JingWen Duan, HuiJie Guo, FuXin Guan, ShuLin Sun, Qiong He, Lei Zhou. 2017-07-04. High-efficiency and full-space manipulation of electromagnetic wave-fronts with metasurfaces. https://doi.org/10.1103/physrevapplied.8.034033

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