A complete multi-band terahertz absorber graphene structure with frequency tunable and polarization-independent for use in biosensors

Articles in Press

Document Type : Research Paper

Authors

1 master student in University of mohaghegh ardabili

2 Faculty member of the Technical Engineering Department, University of Mohaghegh Ardabil

3 Department of Electrical and Computer Engineering, University of Mohaghegh Ardabili, Ardabil, Iran.

Abstract

In this paper, the heterogeneous structure of multi-band perfect absorbing graphene in the terahertz range is designed independent of polarization. The proposed structure consists of three layers of copper, silicon dioxide and heterogeneous graphene structure and analyte. By changing the dimensions of the sub-layers and the geometric shape of the graphene slices, the number of bands, the quality, and the amount of absorption can be changed. Also, by changing the chemical potential of graphene, the absorption frequencies can be adjusted to the required values. The application of this structure in biological sensors is to detect proteins, viruses, cancer cells, telecommunication waves and imaging. With the cuts made on graphene in geometric shapes at the frequencies 4.99 THz, 9.21 THz, 10.5 THz, and 11.7 THz, absorption values of 99.6, 99.3, 99.6 and 94.7% have been obtained, respectively. placing the analyte on the proposed structure causes the displacement of the absorption frequency values, which is due to the different values of the refractive index of different materials. This important property has been used for biosensor design. The highest sensitivity value in the third band is994GHz/RIU, which due to the simple structure consisting of three layers and the use of copper instead of gold, and also by comparing the output values of this research with previous research, can be the best option for making a biosensor. One of the important features of this structure is that it is not sensitive to polarization. The simulations were done in computer simulation software (CST).

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Main Subjects

Journal of Modeling in Engineering

Articles in Press, Accepted Manuscript
Available Online from 26 May 2025

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History

  • Receive Date: 01 April 2024
  • Revise Date: 17 January 2025
  • Accept Date: 16 February 2025

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