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Updated: Oct 11, 2025

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High-Quality Graphene-Based Tunable Absorber Based on Double-Side Coupled-Cavity Effect.

Qiong Wang1, Zhengbiao Ouyang1, Mi Lin1

  • 1THz Technical Research Center of Shenzhen University, Shenzhen Key Laboratory of Micro-Nano Photonic Information Technology, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China.

Nanomaterials (Basel, Switzerland)
|November 27, 2021
PubMed
Summary

This study introduces a novel graphene absorber with dielectric rings, achieving near-complete absorption. The device

Keywords:
coupled-cavity systemfinite difference time domaingraphene-based devicetunable absorber

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Area of Science:

  • Physics
  • Materials Science
  • Electrical Engineering

Background:

  • Graphene-based devices offer superior performance and tunable properties for various applications.
  • Efficient electromagnetic wave absorbers are crucial for applications in sensing, filtering, and stealth technologies.

Purpose of the Study:

  • To propose and investigate a new graphene-based absorber design with enhanced absorption capabilities.
  • To explore the tunability of the absorber's performance through geometrical parameters and chemical potential modulation.

Main Methods:

  • A novel absorber structure comprising a monolayer graphene sheet sandwiched between two layers of dielectric rings was designed.
  • Numerical simulations were employed to analyze the absorption spectra and electromagnetic field distributions.
  • The influence of geometrical parameters and graphene's chemical potential on absorption was systematically studied.

Main Results:

  • Two distinct absorption peaks with near-complete absorption were achieved.
  • The coupled-cavity effect of the dielectric rings enhances electromagnetic wave localization on the graphene surface.
  • Active tunability of absorption peaks was demonstrated by varying graphene's chemical potential, with shifts up to 3.83 THz/eV.

Conclusions:

  • The proposed graphene-dielectric ring structure is an effective design for high-performance absorbers.
  • The device exhibits significant active tunability, making it suitable for dynamic functional applications.
  • Potential applications include tunable absorbers, multichannel filters, and chemical/biochemical sensors.