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Related Concept Videos

Biasing of Metal-Semiconductor Junctions01:27

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Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
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A Metamaterials-Based Absorber Used for Switch Applications with Dynamically Variable Bandwidth in Terahertz Regime.

Yan Liu1, Lingxi Hu2

  • 1School of Microelectronics, Shenzhen Institute of Information Technology, Shenzhen 518172, China.

Materials (Basel, Switzerland)
|July 27, 2024
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Summary

This study introduces a tunable terahertz absorber using graphene and vanadium dioxide (VO2) metamaterials. It offers dynamic bandwidth control for broadband switch applications in terahertz technology.

Keywords:
excellent absorptanceterahertz absorberterahertz switchvariable bandwidth

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Area of Science:

  • Metamaterials
  • Terahertz (THz) regime
  • Solid-state physics

Background:

  • Metamaterials offer unique electromagnetic properties.
  • Graphene and Vanadium Dioxide (VO2) are tunable materials with applications in THz technology.
  • Broadband absorbers are crucial for various THz applications.

Purpose of the Study:

  • To propose and investigate a novel broadband absorber based on graphene and VO2 metamaterials.
  • To demonstrate dynamic bandwidth control for terahertz switch applications.
  • To explore multiple broadband absorption modes using active materials.

Main Methods:

  • Numerical investigation of a metamaterial absorber structure.
  • Utilizing electrical tuning of graphene's Fermi energy level.
  • Employing thermal control of VO2's conductivity phase transition.

Main Results:

  • The absorber operates in the terahertz regime with a tunable bandwidth from 1.5 to 5.4 THz.
  • Achieved over 90% absorptance with 97.1% modulation depth in the 'on' state.
  • Demonstrated a near-zero absorptance in the 'off' state by controlling graphene and VO2.
  • Identified four additional broadband absorption modes.

Conclusions:

  • The proposed graphene-VO2 metamaterial absorber provides dynamic bandwidth control for terahertz applications.
  • This tunable absorber is suitable for broadband switches, cloaking, and THz communications.
  • The active control of graphene and VO2 offers versatile functionalities in the THz spectrum.