In-plane electric field confinement engineering in graphene-based hybrid plasmonic waveguides

Area of Science:

• Photonics and Nanotechnology
• Materials Science
• Optoelectronics

Background:

• Surface plasmon polaritons (SPPs) are electromagnetic modes confined to metal-dielectric interfaces, enhancing fields and enabling nanoscale optical applications.
• Graphene's unique properties can be leveraged with SPPs for advanced optical communications and light absorption devices.
• Existing SPP modes are limited by their out-of-plane electric fields, restricting design flexibility.

Purpose of the Study:

• To numerically analyze field confinement and in-plane enhancement in graphene-based hybrid plasmonic waveguides.
• To compare the performance of different waveguide designs, including metal nanoparticle chains, nano-strips, and slots.
• To identify optimal configurations for improved graphene light absorption devices.

Main Methods:

• Numerical analysis of plasmonic modes in hybrid waveguides.
• Simulation of field confinement and enhancement characteristics.
• Comparison of waveguide geometries: metal nanoparticle chains, nano-strips, and slots.

Main Results:

• Plasmonic modes supported by metal nanoparticle chain waveguides exhibit higher in-plane field enhancement.
• Metal nanoparticle chains outperform nano-strip and slot hybrid plasmonic waveguides in in-plane enhancement.
• Graphene integration significantly influences SPP properties and device performance.

Conclusions:

• Metal nanoparticle chain waveguides are promising for enhancing in-plane light-matter interactions in graphene-based devices.
• The findings support the development of improved graphene light absorption devices, such as electro-optic modulators and photodetectors.
• This research contributes to the advancement of nanoscale optical communication components.