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Performance of a tunable photoconductive graphene plasmonic photodetector

  • Fatemeh Molavi-Vardanjani , Naser Hatefi-Kargan ORCID logo EMAIL logo and Ahmadreza Daraei ORCID logo
Published/Copyright: June 10, 2022
Zeitschrift für Naturforschung A
From the journal Zeitschrift für Naturforschung A Volume 77 Issue 8

Abstract

In this paper, the performance of a graphene photodetector is investigated theoretically in the infrared spectral region (8–12 µm). To increase the absorption of infrared radiation in the graphene layer, plasmon–polaritons are excited in the graphene layer by using dielectric grating. Due to the large propagation constants of plasmon–polaritons compared to the propagation constants of the electromagnetic waves in free space, the dielectric grating is required to provide the phase matching condition of plasmon–polaritons excitation. The results show that due to the excitation of plasmon–polaritons in the graphene layer, the infrared wave has been confined to a small reign around the graphene layer with a full width at half maximum (FWHM) of about 8 nm. Increasing in Fermi energy level leads to a shift in the wavelength of the infrared radiation required to excite plasmon–polaritons in the graphene layer towards shorter wavelengths, so that for the Fermi energy levels of 10, 30, 45, and 60 meV the required wavelengths for plasmon–polaritons excitation are 11.6, 10.6, 9.4, and 8.2 µm, respectively. Under the incidence of the infrared radiation with these wavelengths, and at the corresponding Fermi energy levels, the responsivities of the photodetector at peak points are 2.74, 2.39, 2.19, and 2.04 mA/W, respectively. Therefore, this photodetector is tunable where the detection wavelength is changed by tuning the Fermi energy level of the photodetector. In addition, the results indicate that excitation of plasmon–polaritons approximately increases the responsivity by two times compared to the case without the plasmon–polaritons excitation.

Keywords: graphene; photodetector; plasmon–polaritons; plasmonic; tunable
Corresponding author: Naser Hatefi-Kargan, Department of Physics, Faculty of Science, University of Sistan and Baluchestan, Zahedan, Iran, E-mail:

Funding source: University of Sistan and Baluchestan

Award Identifier / Grant number: Unassigned

  1. Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: This work was supported by the University of Sistan and Baluchestan.

  3. Conflict of interest statement: The authors declare no conflicts of interest regarding this article.

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Received: 2022-03-22
Accepted: 2022-05-19
Published Online: 2022-06-10
Published in Print: 2022-08-26

© 2022 Walter de Gruyter GmbH, Berlin/Boston

Articles in the same Issue

  1. Frontmatter
  2. General
  3. The generation of mass in a non-linear field theory
  4. Gravitation & Cosmology
  5. Towards a self-interacting complex scalar field boson-star model
  6. Beyond semiclassical time
  7. Solid State Physics & Materials Science
  8. Performance of a tunable photoconductive graphene plasmonic photodetector
https://doi.org/10.1515/zna-2022-0085
Keywords for this article
graphene; photodetector; plasmon–polaritons; plasmonic; tunable

Articles in the same Issue

  1. Frontmatter
  2. General
  3. The generation of mass in a non-linear field theory
  4. Gravitation & Cosmology
  5. Towards a self-interacting complex scalar field boson-star model
  6. Beyond semiclassical time
  7. Solid State Physics & Materials Science
  8. Performance of a tunable photoconductive graphene plasmonic photodetector
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