Broadband diffusion of terahertz waves by multi-bit coding metasurfaces

The terahertz region is a special region of the electromagnetic spectrum that incorporates the advantages of both microwaves and infrared light waves. In the past decade, metamaterials with effective medium parameters or gradient phases have been studied to control terahertz waves and realize functi...

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Bibliographic Details
Published in:Light, science & applications science & applications, 2015-09, Vol.4 (9), p.e324-e324
Main Authors: Gao, Li-Hua, Cheng, Qiang, Yang, Jing, Ma, Shao-Jie, Zhao, Jie, Liu, Shuo, Chen, Hai-Bing, He, Qiong, Jiang, Wei-Xiang, Ma, Hui-Feng, Wen, Qi-Ye, Liang, Lan-Ju, Jin, Biao-Bing, Liu, Wei-Wei, Zhou, Lei, Yao, Jian-Quan, Wu, Pei-Heng, Cui, Tie-Jun
Format: Article
Language:English
Subjects:
Coding
Infrared
Mathematical models
Microwaves
Phases
Scattering
Strategy
Terahertz frequencies
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Summary:The terahertz region is a special region of the electromagnetic spectrum that incorporates the advantages of both microwaves and infrared light waves. In the past decade, metamaterials with effective medium parameters or gradient phases have been studied to control terahertz waves and realize functional devices. Here, we present a new approach to manipulate terahertz waves by using coding metasurfaces that are composed of digital coding elements. We propose a general coding unit based on a Minkowski closed-loop particle that is capable of generating 1-bit coding (with two phase states of 0 and 180°), 2-bit coding (with four phase states of 0, 90°, 180°, and 270°), and multi-bit coding elements in the terahertz frequencies by using different geometric scales. We show that multi-bit coding metasurfaces have strong abilities to control terahertz waves by designing-specific coding sequences. As an application, we demonstrate a new scattering strategy of terahertz waves--broadband and wide-angle diffusion--using a 2-bit coding metasurface with a special coding design and verify it by both numerical simulations and experiments. The presented method opens a new route to reducing the scattering of terahertz waves.Light: Science & Applications (2015) 4, e324; doi:10.1038/lsa.2015.97; published online 11 September 2015
ISSN:2047-7538
2047-7538
DOI:10.1038/lsa.2015.97