Characterization of spectral features of cavity modes in one-dimensional graphene-based photonic crystal structures

W. Belhadj (), N. Ben Ali, H. Dakhlaoui, O. H. Alsalmi, H. Alsaif and A. Torchani
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W. Belhadj: Umm Al-Qura University
N. Ben Ali: University of Ha’il
H. Dakhlaoui: Imam Abdulrahman Bin Faisal University
O. H. Alsalmi: Umm Al-Qura University
H. Alsaif: University of Ha’il
A. Torchani: University of Ha’il

The European Physical Journal B: Condensed Matter and Complex Systems, 2021, vol. 94, issue 10, 1-11

Abstract: Abstract In this study, a numerical approach based on the transfer-matrix method (TMM) is employed to investigate, the optical features of an ultra-high-quality factor (Q-factor). The cavity is formed by incorporating a defect layer in a one-dimensional graphene photonic crystal (1D-GPC) structure. The cavity modes are identified, and the dependency of their spectral characteristics on the opto-geometrical parameters of the structure and the chemical potential ( $$\mu _{\mathrm{C}})$$ μ C ) of graphene are investigated in detail. Our simulation results indicate that a tunable ultra-high Q-factor is attainable with the proposed cavity device. It is shown that the eigenfrequencies of the cavity modes vary in similar way versus the considered parameters. While, their Q-factors exhibit some differences in their changes with the thicknesses of the material layers. We have also noticed that the proposed cavity exhibits a cavity mode whose Q-factor increases exponentially with the number of layers in the distributed Bragg reflectors and with the graphene chemical potential. The observed tunable features of such kind of high Q-factor cavity make it an ideal candidate for the realization of ultrasmall tunable narrowband filters, sensing devices, and low-threshold lasers. Graphic abstract

Date: 2021
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DOI: 10.1140/epjb/s10051-021-00194-9

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