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Graphene-Enabled Tunable Phase Gradient Metasurface for Broadband Dispersion Manipulation of Terahertz Wave
Yin Zhang1,2, Yijun Feng2, Junming Zhao2
1School of Information Engineering, Nanjing University of Finance and Economics, Nanjing 210023, China.
Micromachines
|November 25, 2023
Summary
This study presents a tunable graphene metasurface for controlling terahertz waves. The device enables broadband dispersion manipulation for applications in optics and wireless communication.
Area of Science:
- Optics and Photonics
- Materials Science
- Electromagnetics
Background:
- Miniaturization and flexibility are key demands for modern optical devices.
- Graphene-based metasurfaces offer a versatile platform for planar and tunable electromagnetic devices.
Purpose of the Study:
- To propose and demonstrate a tunable metasurface with low-dispersion phase gradient characteristics.
- To explore the potential of graphene metasurfaces for broadband terahertz wave manipulation.
Main Methods:
- Design of a double-layer graphene ribbon metasurface sandwiched with insulating and polymer layers.
- Full-wave simulations to demonstrate metasurface functionality as a planar prism and lens.
- Individual Fermi level tuning of graphene ribbons via bias voltage to control phase shifts.
Main Results:
- Achieved tunable broadband continuous dispersion of abnormal reflection and beam focusing.
- Demonstrated control over terahertz waves in the 3.0-4.0 THz frequency range.
- Showcased regulation of dispersion by reconfiguring Fermi levels.
Conclusions:
- The proposed graphene metasurface enables effective dispersion manipulation of broadband terahertz waves.
- This technology holds significant promise for advancements in optics, imaging, and wireless communication.
