University of Oulu

Somayyeh Asgari, Nosrat Granpayeh, Tapio Fabritius, Controllable terahertz cross-shaped three-dimensional graphene intrinsically chiral metastructure and its biosensing application, Optics Communications, Volume 474, 2020, 126080, ISSN 0030-4018,

Controllable terahertz cross-shaped three-dimensional graphene intrinsically chiral metastructure and its biosensing application

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Author: Asgari, Somayyeh1,2; Granpayeh, Nosrat1; Fabritius, Tapio2
Organizations: 1Center of Excellence in Electromagnetics, Optical Communication Laboratory, Faculty of Electrical Engineering, K. N. Toosi University of Technology, Tehran, Iran
2Information Technology and Electrical Engineering/OPEM, University of Oulu, Oulu, Finland
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 0.9 MB)
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Language: English
Published: Elsevier, 2020
Publish Date: 2022-05-26


In this research, a three-dimensional (3D) graphene intrinsically chiral metastructure in terahertz (THz) region was proposed and analyzed. The unit cell consists of bi-layer cross-shaped graphene ribbons in which the back layer is rotated compared to the front layer. Parameter retrieval method and Kramers–Kronig relations are used for theoretical analysis and derivation of the right-handed and left-handed electromagnetic effective refractive indices of the proposed structure. Based on our analysis, the proposed meta-structure has a tunable and controllable chiral response due to the tunability of graphene and circular dichroism (CD) was reached to 0.2. In order to evaluate the performance of the THz device in biosensor application, its characteristics in chiral biomolecule (collagen) sensing was analyzed. With an optimum design, our simulations show that the refractive index sensitivity value can be obtained as high as 0.96 THz per refractive index unit (THz/RIU) for the CD spectra. Proposed graphene chiral metastructure is promising enabler for controllable polarization-sensitive devices and systems such as tunable polarization filters, rotators, polarizers, biosensors, phase shifters, operating in the THz region.

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Series: Optics communications
ISSN: 0030-4018
ISSN-E: 1873-0310
ISSN-L: 0030-4018
Volume: 474
Article number: 126080
DOI: 10.1016/j.optcom.2020.126080
Type of Publication: A1 Journal article – refereed
Field of Science: 213 Electronic, automation and communications engineering, electronics
Funding: This work was supported in part by the Academy of Finland’s Finnish Research Infrastructures (FIRI) under Grant 320017.
Academy of Finland Grant Number: 320017
Detailed Information: 320017 (Academy of Finland Funding decision)
Copyright information: © 2020 Elsevier B.V. All rights reserved. This manuscript version is made available under the CC-BY-NC-ND 4.0 license