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Graphene-Based Tunable Plasmonic Perfect Absorber in FIR-Band Range

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Abstract

In this paper, a structure based on metal-graphene-insulator–metal (MGIM) is designed as a tunable plasmonic perfect absorber (PPA) in the FIR-band range. Simulation results performed with the 3D finite difference time domain (FDTD) method show that in the perpendicular incidence of a plane wave light in the range of 35 to 105 µm, the absorption spectrum of the proposed device has a resonance peak with absorption above 95%, which can show excellent tunability by applying a gate bias voltage to the graphene nanolayers in the structure. In our proposed structure unit cell, there is a C1 graphene nanolayer in the center and a C2 graphene nanolayer around it that bias voltage is applied only to C2, then changing the chemical potential of the two graphene nanolayers relative to each other, the absorption spectrum of the device shifts in the desired wavelength range.

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Data Availability

The materials described in the manuscript, including all relevant raw data, will be freely available to any scientist wishing to use them for non-commercial purposes, without breaching participant confidentiality.

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  1. Department of Electrical and Computer Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran

    Zahra Madadi

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  1. Zahra Madadi
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Madadi, Z. Graphene-Based Tunable Plasmonic Perfect Absorber in FIR-Band Range. Plasmonics 16, 1909–1914 (2021). https://doi.org/10.1007/s11468-021-01440-7

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