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Topologically protected edge states in graphene plasmonic crystals
Optics Express
|October 19, 2017
Summary
Researchers developed a novel graphene plasmonic crystal for topological plasmonics. This ultracompact crystal enables topologically protected edge transmission, immune to backscattering, for advanced nanophotonic systems.
Area of Science:
- Condensed Matter Physics
- Nanophotonics
- Plasmonics
Background:
- Topological phenomena offer unique wave propagation properties.
- Graphene's tunable electronic properties are ideal for advanced photonic devices.
Purpose of the Study:
- To propose and investigate a 2D graphene plasmonic crystal for topological applications.
- To demonstrate topologically protected edge states and boundary propagation.
Main Methods:
- Periodic arrangement of graphene nanodisks to form a 2D plasmonic crystal.
- Tuning graphene's chemical potential to break inversion symmetry and induce band topology.
- Designing N-shaped channels to realize topological edge states.
Main Results:
- Achieved band topology effects by tuning graphene nanodisk chemical potential.
- Demonstrated topologically edged transmission within the band gap.
- Realized backscattering-immune exterior boundary propagation via chemical potential modification.
Conclusions:
- The proposed ultracompact graphene plasmonic crystal exhibits topological properties.
- Potential applications in topological plasmonics and high-density nanophotonic integrated systems.
