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VO2-Graphene Terahertz Multifunctional Metasurface with Switchable Broadband Waveplates and Absorber.

Hong Su1, Tao Huang1, Gaozhao Liu1

  • 1State Key Laboratory of Radio Frequency Heterogeneous Integration, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, Shenzhen Key Laboratory of Laser Engineering, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China.

Nanomaterials (Basel, Switzerland)
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PubMed
Summary

This study introduces a novel terahertz multifunctional metasurface using vanadium dioxide and graphene. It dynamically switches between waveplate and absorber functions, enabling tunable terahertz applications.

Keywords:
absorbergraphenemetasurfaceterahertzwaveplate

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Area of Science:

  • Condensed Matter Physics
  • Metamaterials Science
  • Terahertz Technology

Background:

  • Metasurfaces offer advanced control over electromagnetic waves.
  • Vanadium dioxide (VO2) and graphene are promising materials for tunable terahertz devices.
  • Achieving multifunctional terahertz devices with dynamic switching capabilities is a key challenge.

Purpose of the Study:

  • To propose and demonstrate a terahertz multifunctional metasurface.
  • To enable switching between waveplate and absorber functionalities.
  • To explore tunable terahertz wave manipulation using VO2 and graphene.

Main Methods:

  • Fabrication of a metasurface integrating VO2 and graphene.
  • Electrical control of graphene's Fermi energy to tune waveplate properties (half-wave plate and quarter-wave plate).
  • Utilizing temperature-dependent phase transition of VO2 for absorption functionality and dual-parameter modulation.

Main Results:

  • The metasurface exhibits tunable half-wave plate (HWP) and quarter-wave plate (QWP) functionalities by electrically controlling graphene's Fermi energy below 300 K.
  • Above 340 K, VO2 enables absorption via dipole resonance.
  • Dual-parameter modulation of transverse electric (TE) and transverse magnetic (TM) waves is achieved with tunable absorption bandwidths.
  • Performance remains robust under large-angle incidence.

Conclusions:

  • The proposed VO2-graphene metasurface offers dynamic switching between waveplate and absorber functionalities.
  • Tunable terahertz wave manipulation is demonstrated through electrical and thermal control.
  • The metasurface shows potential for terahertz optical switches, spectroscopy, modulators, and communication systems.