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Space-time-coding digital metasurfaces
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DOI：10.1038/s41467-018-06802-0.png)
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摘要
En 中文
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.
Keyword:
PHASE DISCONTINUITIES
TERAHERTZ WAVES
METAMATERIALS
PROPAGATION
RADAR
ARRAY
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期刊
IF:
15.7
论文数:
9.3W
被引数:
91.2W
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引用论文
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