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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
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A Tunable Terahertz Absorber Based on Double-Layer Patterned Graphene Metamaterials.

Xin Tang1,2, Haoduo Jia1,2, Luyang Liu1

  • 1Institute of Applied Electronics, China Academy of Engineering Physics, Mianyang 621000, China.

Materials (Basel, Switzerland)
|June 10, 2023
PubMed
Summary

We developed a novel graphene-based terahertz metamaterial absorber. This device achieves nearly perfect broadband absorption and is insensitive to polarization and angle, with tunable properties for optoelectronic applications.

Keywords:
absorbergraphenemetamaterialterahertz

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Area of Science:

  • Photonics
  • Metamaterials
  • Graphene applications

Background:

  • Graphene offers unique properties like high electron mobility and tunability, making it suitable for advanced photonic devices.
  • Conventional materials lack the exotic properties required for highly tunable photonic applications.
  • Metamaterial absorbers offer enhanced light absorption capabilities.

Purpose of the Study:

  • To propose and simulate a novel terahertz metamaterial absorber utilizing patterned graphene.
  • To investigate the absorption performance, polarization, and angle sensitivity of the designed absorber.
  • To explore the tunability of the absorber's characteristics.

Main Methods:

  • Design of a metamaterial absorber composed of stacked graphene disks, graphene ring patterns, and a metal bottom layer.
  • Separation of layers using insulating dielectric materials.
  • Electromagnetic simulations to analyze absorption spectra and performance characteristics.

Main Results:

  • Achieved nearly perfect broadband absorption in the 0.53-1.50 THz range.
  • Demonstrated polarization-insensitive and angle-insensitive absorption.
  • Confirmed tunability of absorption by adjusting graphene's Fermi energy and structural geometry.

Conclusions:

  • The designed graphene-based terahertz metamaterial absorber exhibits excellent broadband absorption with desirable insensitivity.
  • Tunable absorption characteristics open possibilities for advanced optoelectronic device applications.
  • The proposed structure shows significant potential for use in photodetectors, photosensors, and other optoelectronic devices.