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Type: Journal article
Title: Tunable localized surface plasmon graphene metasurface for multiband superabsorption and terahertz sensing
Author: Islam, M.
Sultana, J.
Biabanifard, M.
Vafapour, Z.
Nine, M.
Dinovitser, A.
Cordeiro, C.
Ng, B.-.H.
Abbott, D.
Citation: Carbon, 2020; 158:559-567
Publisher: Elsevier
Issue Date: 2020
ISSN: 0008-6223
Statement of
M.S. Islam, J. Sultana, M. Biabanifard, Z. Vafapour, M.J. Nine, A. Dinovitser, C.M.B. Cordeiro, B.W.-H. Ng, D. Abbott
Abstract: We propose a plasmon induced tunable metasurface for multiband superabsorption and terahertz sensing. It consists of a graphene sheet that facilitates perfect absorption where the graphene pattern at the top layer creates an enhanced evanescent wave that facilitates the metasurface to work as a sensor. The modelling and numerical analysis are carried out using Finite Element Method (FEM) based software, CST microwave studio where a genetic algorithm (GA) is used to optimize the geometric parameters, and metasurface tunability is achieved via an external gate voltage on the graphene. By exploiting graphene’s tunable properties we demonstrate a multiband superabsorption spectra having a maximum absorption of 99.7% in a frequency range of 0.1–2.0 THz that also maintain unique optical performance over a wide incidence angle. Further results show how the superabsorber can be used as a sensor, where the resonance frequency shifts with the refractive index of the surrounding environment.
Keywords: Graphene; metasurface; absorber; terahertz sensor
Rights: © 2019 Elsevier Ltd. All rights reserved.
RMID: 1000011146
DOI: 10.1016/j.carbon.2019.11.026
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Appears in Collections:Electrical and Electronic Engineering publications

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