Polarization and incident angle independent multifunctional tunable terahertz metasurface based on graphene

Ubaid Ur Rahman Qureshi; Shahid Basir; Fatma Mallek; Habib Hamam

doi:10.1038/s41598-024-55676-4

Polarization and incident angle independent multifunctional tunable terahertz metasurface based on graphene

Sci Rep. 2024 Mar 1;14(1):5118. doi: 10.1038/s41598-024-55676-4.

Authors

Ubaid Ur Rahman Qureshi¹, Shahid Basir², Fatma Mallek³, Habib Hamam^{3

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Affiliations

¹ Beijing Engineering Research Center for Mixed Reality and Advanced Display, School of Optics and Photonics, Beijing Institute of Technology, Beijing, 100081, China. ubaid_ur_rahman@bit.edu.cn.
² School of Engineering and Applied Sciences, ISRA University, Islamabad, Pakistan.
³ Faculty of Engineering, Uni de Moncton, Moncton, NB, E1A3E9, Canada.
⁴ International Institute of Technology and Management (IITG), Avenue des Grandes Ecoles, Libreville, Gabon.
⁵ Department of Electrical and Electronic Engineering Science, School of Electrical Engineering, University of Johannesburg, Johannesburg, 2006, South Africa.

Abstract

Motivated by the imperative demand for design integration and miniaturization within the terahertz (THz) spectrum, this study presents an innovative solution to the challenges associated with singular functionality, limited application scope, and intricate structures prevalent in conventional metasurfaces. The proposed multifunctional tunable metasurface leverages a hybridized grapheme-metal structure, addressing critical limitations in existing designs. Comprising three distinct layers, namely a graphene-gold resonance layer, a Topas dielectric layer, and a bottom gold film reflective layer, this terahertz metasurface exhibits multifunctionality that is both polarization and incident-angle independent. The metasurface demonstrates a broadband circular dichroism (CD) function when subjected to incident circularly polarized waves. In contrast, under linear incidence, the proposed design achieves functionalities encompassing linear dichroism (LD) and polarization conversion. Remarkably, graphene's chemical potential and the incident light's state can be manipulated to tune each functional aspect's intensity finely. The proposed tunable multifaceted metasurface showcases significant referential importance within the terahertz spectrum, mainly contributing to advancing CD metamirrors, chiral photodetectors, polarization digital imaging systems, and intelligent switches.