Two-band graphene-based polarization-independent full absorber as a biosensor

Articles in Press

Document Type : Research Paper

Authors

1 Department of Technical and Engineering, university of mohaghegh ardabili

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

3 master student in University of mohaghegh ardabili

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

Abstract

In this paper the cut structure of polarization-independent two-band perfect absorbing graphene is proposed. The proposed structure consists of three layers of gold, silicon dioxide, and a cut graphene layer and analyte. By changing the size of the layers and the shape of the graphene slices, the number of bands can be changed, and by changing the values of the chemical potential and the relaxation time of the graphene, the quality and amount of absorption can be changed. In contrast, the absorption wavelength can be adjusted to the desired value. This structure is suitable as a biosensor for detecting viruses, proteins, and cancer cells,, filtering telecommunication waves . According to the cuts made on graphene at wavelengths of 24581 nm and 27640 nm, absorption values of 99.9 and 99.9% were obtained, respectively. Different refractive index of the elements with the placement of the analyte on the designed structure causes the displacement of the absorbed wavelength values and the type of the placed element can be recognized using the wavelength values, which is the basis of biosensor work. The highest sensitivity value is obtained in the second band of RIU48200/nm, which can be the best option for making a biosensor due to the simple structure consisting of three layers and by comparing the output values of this research with previous research. Another important feature of this structure is that it is not sensitive to polarization. The simulations have been done in computer simulation software (CST).

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Journal of Modeling in Engineering

Articles in Press, Accepted Manuscript
Available Online from 16 June 2025

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History

  • Receive Date: 02 June 2024
  • Revise Date: 13 March 2025
  • Accept Date: 06 April 2025

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