Reprogrammable Graphene-based Metasurface Mirror with Adaptive Focal Point for THz Imaging

Scientific Reports
Seyed Ehsan HosseininejadEduard Alarcón

Abstract

Recent emergence of metasurfaces has enabled the development of ultra-thin flat optical components through different wavefront shaping techniques at various wavelengths. However, due to the non-adaptive nature of conventional metasurfaces, the focal point of the resulting optics needs to be fixed at the design stage, thus severely limiting its reconfigurability and applicability. In this paper, we aim to overcome such constraint by presenting a flat reflective component that can be reprogrammed to focus terahertz waves at a desired point in the near-field region. To this end, we first propose a graphene-based unit cell with phase reconfigurability, and then employ the coding metasurface approach to draw the phase profile required to set the focus on the target point. Our results show that the proposed component can operate close to the diffraction limit with high focusing range and low focusing error. We also demonstrate that, through appropriate automation, the reprogrammability of the metamirror could be leveraged to develop compact terahertz scanning and imaging systems, as well as novel reconfigurable components for terahertz wireless communications.

References

Nov 15, 2012·Nature Communications·Xianzhong ChenThomas Zentgraf
Mar 24, 2015·Scientific Reports·Shi-Wei QuChi Hou Chan
Jul 24, 2015·Scientific Reports·Zubin LiYongmin Liu
Nov 26, 2015·Science Advances·Luca BanszerusChristoph Stampfer
Jun 17, 2016·Reports on Progress in Physics·Hou-Tong ChenNanfang Yu
Feb 9, 2017·Scientific Reports·Cheng HuangXiangang Luo
Aug 5, 2017·Nature Communications·Lianlin LiShuang Zhang
Nov 18, 2016·Light, Science & Applications·Tie-Jun CuiLian-Lin Li

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Citations

Sep 15, 2020·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·Zhang YaxinYang Ziqiang
May 8, 2020·Scientific Reports·Mohammad Reza Tavakol, Amin Khavasi
Feb 8, 2020·Scientific Reports·Paris Ang, George V Eleftheriades
May 1, 2021·Sensors·Hamidreza TaghvaeeAlbert Cabellos-Aparicio
Oct 7, 2019··Hamidreza TaghvaeeMarios Lestas

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Methods Mentioned

BETA
Gate Array

Software Mentioned

CST Microwave Studio

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