Analytical model for plasmon modes in graphene-coated nanowire

Area of Science:

• * Physics and Materials Science
• * Nanophotonics and Plasmonics

Background:

• * Graphene's unique electronic properties enable novel plasmonic phenomena.
• * Cylindrical waveguides are crucial for integrated photonic devices.

Purpose of the Study:

• * To develop an analytical model for plasmon modes in graphene-coated dielectric nanowires.
• * To classify plasmon modes based on azimuthal field distribution.
• * To investigate the tunability of plasmon mode characteristics.

Main Methods:

• * Derivation of the eigen equation for the dispersion relation of plasmon modes.
• * Analysis of electromagnetic field expressions, including azimuthal phase factors (exp(imφ)).

Main Results:

• * Plasmon modes are classified by their azimuthal field distribution.
• * Key parameters influencing plasmon mode characteristics identified: nanowire radius, dielectric permittivity, and graphene chemical potential.
• * The model offers a rapid method for understanding mode behavior.

Conclusions:

• * The analytical model provides valuable insights into graphene-coated nanowire plasmonics.
• * Tunability of plasmon modes is demonstrated through material and geometric parameters.
• * The findings are relevant for advancing applications in cylindrical waveguide graphene plasmonics.