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Dual-function tunable metasurface for polarization-insensitive electromagnetic induction transparency and dual-band

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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

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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.