Plasmonic topological edge states in ring-structure gate graphene.

Area of Science:

• Photonics
• Condensed Matter Physics
• Materials Science

Background:

• Topological photonic states offer robustness against defects, crucial for fault-tolerant photonic devices.
• Current topological photonic proposals are often complex, bulky, or limited to microwave frequencies.

Purpose of the Study:

• To theoretically demonstrate highly confined topological plasmonic states at infrared frequencies.
• To propose a compact and potentially reconfigurable device architecture using graphene.

Main Methods:

• Utilizing monolayer graphene with a ring-structure gate.
• Applying a suitable bias voltage to induce strong Bragg scattering of graphene surface plasmons.
• Imparting nontrivial topological properties to the plasmonic states.

Main Results:

• Achieved highly confined topological plasmonic states at infrared frequencies.
• Demonstrated the feasibility of a compact gate-graphene structure for topological state generation.
• Showcased the potential for dynamic reconfigurability.

Conclusions:

• The proposed design offers a compact and efficient method for realizing topological plasmonic states.
• This work could lead to the development of robust, nanoscale, integrated photonic devices.
• The approach is suitable for infrared frequencies and offers dynamic control.