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Tunable multiple phase-coupled plasmon-induced transparencies in graphene metamaterials
Optics Express
|April 4, 2015
Summary
Researchers show multiple electromagnetically induced transparency (EIT)-like responses in graphene metamaterials. These tunable optical responses in the mid-infrared open doors for advanced electro-optic devices.
Area of Science:
- Condensed Matter Physics
- Nanophotonics
- Metamaterials
Background:
- Electromagnetically induced transparency (EIT) is a quantum interference phenomenon.
- Graphene metamaterials offer unique optical properties due to tunable plasmon resonances.
Purpose of the Study:
- To demonstrate and theoretically model multiple EIT-like spectral responses in graphene Fabry-Pérot cavities.
- To explore the tunability of these responses for potential device applications.
Main Methods:
- Fabrication of self-assembled graphene Fabry-Pérot cavities.
- Utilizing graphene plasmon resonances and phase-coupling effects.
- Developing a transfer matrix model for theoretical prediction and comparison with numerical simulations.
Main Results:
- Observation of high-contrast (~90%) multiple EIT-like windows in the mid-infrared spectrum.
- Theoretical predictions from the transfer matrix model show excellent agreement with numerical simulations.
- Demonstrated efficient tunability of optical responses by adjusting graphene Fermi level and cavity separations.
Conclusions:
- The proposed graphene metamaterial structure enables control over multiple EIT-like spectral responses.
- This work provides a pathway for developing on-chip multifunctional electro-optic devices.
- Potential applications include multi-channel-selective filters, sensors, and modulators.
