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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)35179-35191
Number of pages13
JournalOptics Express
Volume28
Issue number23
DOIs
Publication statusPublished - 9 Nov 2020

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