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Fabry-Perot enhanced Faraday rotation in graphene
Optics Express
|October 24, 2013
Summary
Giant Faraday rotation in graphene is boosted by substrate interference, enhancing magneto-optical applications. This effect, observed in terahertz range, also improves light transmission.
Area of Science:
- Condensed matter physics
- Optics
- Materials science
Background:
- Graphene exhibits significant Faraday rotation in the terahertz range due to cyclotron resonance.
- Fabry-Perot interference in supporting substrates can influence optical properties.
Purpose of the Study:
- To investigate the enhancement of Faraday rotation in graphene via substrate-induced Fabry-Perot interference.
- To achieve simultaneously enhanced total transmission for improved magneto-optical applications.
Main Methods:
- Fabrication of epitaxial multilayer graphene on 6H-SiC substrate.
- Measurement of far-infrared spectra to observe Faraday rotation and transmission.
- Analysis of interference fringes and their effect on optical properties.
Main Results:
- Giant Faraday rotation in graphene is significantly increased by constructive Fabry-Perot interference.
- A Faraday rotation of up to 0.15 radians (9°) was achieved.
- Enhanced total transmission was observed concurrently with increased Faraday rotation.
Conclusions:
- Constructive Fabry-Perot interference in the substrate is a viable method to enhance Faraday rotation in graphene.
- The combined enhancement of Faraday rotation and transmission offers advantages for graphene-based magneto-optical devices.
- Optical cavity principles can be further explored to optimize Faraday rotation.
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