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A Non-Volatile Tunable Terahertz Metamaterial Absorber Using Graphene Floating Gate.

Jinjun Bai1, Wei Shen1, Jia Shi1

  • 1Tianjin Key Laboratory of Optoelectronic Detection Technology and Systems, School of Electrical and Electronic Engineering, Tiangong University, Tianjin 300387, China.

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|April 3, 2021
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Summary

A novel graphene metamaterial absorber offers tunable terahertz absorption. This non-volatile, anti-interference device demonstrates wide bandwidth and potential for advanced imaging and sensing applications.

Keywords:
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Area of Science:

  • Metamaterials
  • Terahertz Technology
  • Graphene-based Devices

Background:

  • Traditional graphene-dielectric-metal absorbers lack non-volatility and anti-interference capabilities.
  • Tunable terahertz absorbers are crucial for advanced applications in sensing and imaging.

Purpose of the Study:

  • To propose and investigate a tunable terahertz metamaterial absorber based on a graphene floating gate.
  • To analyze the absorption spectra, tunability, and physical mechanisms of the proposed absorber.
  • To evaluate the influence of geometric parameters, polarization, and incident angles on absorption performance.

Main Methods:

  • Finite Element Method (FEM) simulations were employed.
  • Absorption spectra, electric field energy distribution, and tunability were analyzed.
  • The impact of Fermi level, geometry, polarization, and incident angles were investigated.

Main Results:

  • The absorber exhibits a 90% absorption bandwidth of 2.597 THz centered at 3.970 THz.
  • Continuous tunability of maximum absorption from 14.405% to 99.864% was achieved by adjusting the Fermi level (0 eV to 0.8 eV).
  • The absorber demonstrated polarization insensitivity and wide-angle performance.

Conclusions:

  • The proposed graphene floating gate metamaterial absorber offers non-volatile and anti-interference properties.
  • The device provides excellent tunability and wide-angle, polarization-insensitive absorption.
  • Potential applications include terahertz imaging, sensing, and photoelectric detection.