Related Experiment Video
Updated: Jun 5, 2025
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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
Published on: December 27, 2012
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Electrically tunable THz graphene metasurface wave retarders.
Hyunwoo Park1, Sodam Jeong1, Changwon Seo2
1Department of Physics, University of Ulsan, Ulsan 44610, Republic of Korea.
Nanophotonics (Berlin, Germany)
|December 5, 2024
Summary
Researchers electrically controlled terahertz wave polarization using graphene-integrated metasurfaces. This breakthrough enables tunable optical components and advanced polarization-sensitive terahertz technology.
Area of Science:
- Optics and Photonics
- Materials Science
- Electromagnetics
Background:
- Chiral and birefringent anisotropic materials manipulate electromagnetic wave polarization.
- Low anisotropy in natural materials limits miniaturization of terahertz (THz) optical devices.
Purpose of the Study:
- To demonstrate electrical control of terahertz wave phase retardation using graphene-integrated metasurfaces.
- To overcome limitations of natural materials for compact THz polarization devices.
Main Methods:
- Integration of patterned mono- and bilayer graphene onto an isotropic metasurface.
- Electrical modulation of graphene conductivity to control refractive index.
- Experimental measurement of phase retardation for orthogonal polarization states.
Main Results:
- Achieved phase retardation from 15° to 81° with monolayer graphene.
- Demonstrated maximum phase retardation of 90° with bilayer graphene, enabling a tunable quarter-wave plate.
- Showcased electrically tunable refractive index via anisotropic weakening of capacitive coupling.
Conclusions:
- Graphene-integrated metasurfaces offer electrically tunable control over terahertz wave polarization.
- This technology facilitates the development of compact and versatile THz polarization devices.
- Potential for advancements in polarization-sensitive terahertz technology and applications.
