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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
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Electrically tunable graphene metamaterial with strong broadband absorption
Wei Yao1,2, Linlong Tang2, Jinpeng Nong2
1School of Optoelectronic Science and Engineering, State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, People's Republic of China.
Nanotechnology
|October 23, 2020
Summary
This study introduces a novel graphene-based metamaterial for tunable plasmonics. It demonstrates electrical modulation of absorption by over 50%, enabling broadband optical devices.
Area of Science:
- Plasmonics and Metamaterials
- Graphene-based Nanostructures
- Optoelectronics
Background:
- Traditional metal-based metamaterials lack electrical tunability.
- Tunable plasmonics and metamaterials are crucial for advanced optical applications.
- Graphene offers unique electrical properties for dynamic modulation.
Purpose of the Study:
- To propose and demonstrate a graphene-Al2O3-graphene metamaterial with electrical tunability.
- To achieve significant modulation of absorption and enhanced bandwidth.
- To investigate the influence of various parameters on the metamaterial's optical behavior.
Main Methods:
- Fabrication of perpendicular or parallel graphene-Al2O3-graphene stacks.
- Application of external voltage for simultaneous modulation of graphene layers.
- Optical characterization and modeling of absorption spectra and bandwidth.
- Analysis of factors including incident polarization, dielectric thickness, and Fermi energy.
Main Results:
- Achieved >50% modulation of hybridized mode absorption via electrical control.
- Demonstrated an enhanced absorption bandwidth of 3.55 μm, 1.7 times that of single-layer graphene.
- Identified the critical role of graphene's small relaxation time for broadband absorption.
- Showcased tunability influenced by polarization, dielectric thickness, and graphene Fermi energy.
Conclusions:
- The proposed graphene metamaterial enables significant electrical modulation of optical absorption.
- This technology is vital for developing broadband, tunable graphene-based optical and optoelectronic devices.
- The findings provide a pathway for advanced active plasmonic and metamaterial designs.
