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Multifunctional 2-bit coded reconfigurable metasurface based on graphene-vanadium dioxide.

Binggang Xiao, Zhonghua Wei, Panpeng Ge

|June 10, 2024

Summary

This summary is machine-generated.

This study introduces a graphene-vanadium dioxide metasurface that can control terahertz beams and absorb terahertz waves. Temperature changes enable switching between reflection beam control and absorption, offering a versatile device.

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Area of Science:

Metamaterials and Nanophotonics
Terahertz (THz) Technology
Condensed Matter Physics

Background:

Reconfigurable metasurfaces offer dynamic control over electromagnetic waves.
Graphene and vanadium dioxide are promising materials for tunable electronic and optical properties.

Purpose of the Study:

To propose and demonstrate a graphene-vanadium dioxide-based reconfigurable metasurface unit structure.
To achieve 2-bit coding for precise phase control of reflected terahertz waves.
To enable switching between beam control and terahertz absorption functionalities.

Main Methods:

Utilizing changes in graphene Fermi energy for 2-bit coding, achieving 90° phase differences.
Investigating multi-beam reflection modulation with 1-bit coding.
Applying convolution theorem for single-beam reflection control in 2-bit mode.
Leveraging the insulating state of vanadium dioxide for terahertz absorption.

Main Results:

Demonstrated four reflection units with a 90° phase difference using 2-bit graphene coding.
Confirmed modulation of multi-beam reflection waves with 1-bit coding.
Achieved single-beam reflected wave control via metasurface and convolution theorem in 2-bit mode.
Transformed the structure into a terahertz absorber by utilizing the insulating state of vanadium dioxide.

Conclusions:

The proposed metasurface offers dual functionality as a reflection beam controller and a terahertz absorber.
Temperature-induced phase transition of vanadium dioxide allows seamless switching between functionalities without device redesign.
The 2-bit coded metasurface provides enhanced single-beam regulation capabilities compared to 1-bit systems, increasing device versatility.