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Development of a 3D Graphene Electrode Dielectrophoretic Device
Published on: June 22, 2014
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Graphene controlled Brewster angle device for ultra broadband terahertz modulation
Zefeng Chen1, Xuequan Chen1, Li Tao1
1Department of Electronic Engineering, The Chinese University of Hong Kong, Hongkong, 999077, China.
Nature Communications
|November 23, 2018
Summary
We developed a novel solid-state terahertz modulator using tunable Brewster angle with graphene. This device achieves deep intensity and phase modulation across an ultra-broadband frequency range.
Area of Science:
- Optics and Photonics
- Materials Science
- Condensed Matter Physics
Background:
- High tunability in both intensity and phase is crucial for terahertz modulators.
- Existing terahertz modulation technologies lack broadband capabilities and deep modulation depth.
Purpose of the Study:
- To demonstrate a tunable Brewster angle effect controlled by graphene.
- To develop a highly-tunable, solid-state graphene/quartz modulator for terahertz applications.
Main Methods:
- Utilizing the tunable Brewster angle mechanism controlled by graphene's electrical conductivity.
- Fabricating a solid-state graphene/quartz device for terahertz modulation.
Main Results:
- Achieved near-perfect intensity modulation (99.3-99.9%) with spectrally flat modulation depth.
- Demonstrated phase tunability up to 140 degrees.
- Operated effectively across an ultra-broadband frequency range (0.5-1.6 THz).
Conclusions:
- The tunable Brewster angle principle offers an effective method for broadband terahertz modulation.
- This graphene-based modulator overcomes limitations of resonance-based devices, enabling deep and broadband modulation.
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