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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
Published on: December 27, 2012
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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.
Micromachines
|April 3, 2021
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.
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.
