Enhanced terahertz focusing for a graphene-enabled active metalens

Jianzhou Huang, Hongyu Guan, Bin Hu*, Guocui Wang, Weiguang Liu, Zongyuan Wang, Juan Liu, Yan Zhang, Yongtian Wang

*此作品的通讯作者

科研成果: 期刊稿件文章同行评审

17 引用 (Scopus)

摘要

Graphene-based terahertz (THz) metasurfaces have the advantages of ultra-small thickness, electrical tunability, and fast tuning speed. However, many such structures suffer low efficiency, especially for transmissive devices. Here we propose a hybrid structure for focusing THz waves with tunability and enhanced focusing efficiency, which is composed of a graphene-loaded metallic metasurface sandwiched by two mutually orthogonal gratings. Experimental results show that due to the multi-reflection between the metasurface layer and the grating layer, the focusing efficiency is enhanced by 1.8 times, and the focal length of the metalens is increased by 0.61 mm when the applied gate voltage on the graphene is increased from 0 V to 1.4 V. We hope the proposed structure may open a new avenue for reconfigurable THz metasurfaces with high efficiencies.

源语言英语
页(从-至)35179-35191
页数13
期刊Optics Express
28
23
DOI
出版状态已出版 - 9 11月 2020

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