Space-time-coding digital metasurfaces.
Space-time-coding digital metasurfaces.
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时空编码数字超表面
DOI:
10.1038/s41467-018-06802-0
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发表时间:
2018-10-18
影响因子:
16.6
通讯作者:
Cui TJ
中科院分区:
文献类型:
--
作者:
Zhang L;Chen XQ;Liu S;Zhang Q;Zhao J;Dai JY;Bai GD;Wan X;Cheng Q;Castaldi G;Galdi V;Cui TJ
The recently proposed digital coding metasurfaces make it possible to control electromagnetic (EM) waves in real time, and allow the implementation of many different functionalities in a programmable way. However, current configurations are only space-encoded, and do not exploit the temporal dimension. Here, we propose a general theory of space-time modulated digital coding metasurfaces to obtain simultaneous manipulations of EM waves in both space and frequency domains, i.e., to control the propagation direction and harmonic power distribution simultaneously. As proof-of-principle application examples, we consider harmonic beam steering, beam shaping, and scattering-signature control. For validation, we realize a prototype controlled by a field-programmable gate array, which implements the harmonic beam steering via an optimized space-time coding sequence. Numerical and experimental results, in good agreement, demonstrate good performance of the proposed approach, with potential applications to diverse fields such as wireless communications, cognitive radars, adaptive beamforming, holographic imaging.
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