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Published on: July 24, 2015
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Broadly tunable graphene plasmons using an ion-gel top gate with low control voltage
1National Center for Nanoscience and technology, Beijing 100190, China. daiq@nanoctr.cn yangxx@nanoctr.cn.
Nanoscale
|November 5, 2015
Summary
High carrier densities in graphene enable tunable graphene plasmons using efficient ion-gel dielectrics. This research demonstrates weak plasmon-phonon coupling, ideal for optical modulators and filters.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Graphene's electrostatic tunability is crucial for active plasmonics.
- High carrier densities are key for broad tunability in graphene plasmonics.
- Applications include tunable infrared and terahertz optical elements.
Purpose of the Study:
- To achieve broadly tunable graphene plasmons using an efficient dielectric.
- To investigate the coupling between graphene plasmons and ion-gel molecular vibrations.
- To assess the suitability of ion-gels for graphene plasmonic devices.
Main Methods:
- Utilized an ion-gel dielectric with ultra-high capacitance.
- Applied low voltage modulation to tune graphene plasmons.
- Experimentally explored plasmon-phonon coupling in the graphene/ion-gel system.
Main Results:
- Achieved broadly tunable graphene plasmons with a shift of ~1270 cm⁻¹ using ~4 V.
- Demonstrated weak plasmon-phonon coupling in the graphene/ion-gel system.
- Observed limited effects of coupling on plasmon properties.
Conclusions:
- Ion-gels are effective dielectrics for broadly tunable graphene plasmonic devices.
- The weak plasmon-phonon coupling minimizes negative impacts on plasmon properties.
- This system is promising for developing optical modulators, filters, and wavelength multiplexers.
