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Updated: Jul 15, 2025
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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
Published on: December 27, 2012
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Dual-function tunable metasurface for polarization-insensitive electromagnetic induction transparency and dual-band
Yunping Qi1, Zihao Zhou1, Qiang Shi1
1College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, People's Republic of China.
Nanotechnology
|September 27, 2023
Summary
This study introduces a novel dual-mode metasurface. It functions as a tunable slow light device at room temperature and a dual-band absorber at high temperatures, both controlled by graphene
Area of Science:
- Terahertz (THz) photonics
- Metamaterials and Plasmonics
- Condensed Matter Physics
Background:
- Metasurfaces offer unique electromagnetic properties.
- Graphene and Vanadium Dioxide (VO2) are tunable materials for THz applications.
- Controlling light-matter interactions in the THz regime is crucial for advanced devices.
Purpose of the Study:
- To propose and investigate a dual-operating mode metasurface.
- To demonstrate temperature-controlled switching between electromagnetically induced transparency (EIT)-like and dual-band absorption functionalities.
- To explore applications as a slow light device and a refractive index sensor.
Main Methods:
- Theoretical modeling using a two-particle model.
- Numerical simulations based on the finite element method.
- Fabrication and characterization of a graphene and VO2 based metasurface.
Main Results:
- At room temperature, a polarization-insensitive EIT-like effect was observed, tunable via graphene's Fermi energy (EF).
- At high temperature, the metasurface exhibited dual-band absorption (78.6% and 99.9% at 1.13 THz and 2.16 THz), also tunable by EF.
- The device demonstrated polarization insensitivity and wide incidence angle tolerance in both operating modes.
Conclusions:
- The proposed metasurface successfully achieves dual-mode operation through temperature switching.
- It shows potential as a tunable slow light device (max group delay 0.5 ps) and a sensitive refractive index sensor (max sensitivity 0.5 THz/RIU).
- This work presents a new platform for multifunctional THz devices.
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