研究目的
To investigate the dispersion theory of surface plasmon polaritons (SPP) on bilayer graphene ribbon arrays metasurface using a modal expansion method and derive analytical dispersion expressions for the first time.
研究成果
The analytical dispersion expressions for SPP modes on bilayer graphene ribbon arrays are derived for the first time, enabling analysis of dispersion and propagation loss. This opens new possibilities for developing low-loss plasmonic waveguides, planar retroreflectors, and enhanced terahertz sources.
研究不足
The study assumes symmetric structure and same dielectric permittivity for upper and lower media; it ignores different stacking orders of bilayer graphene and does not consider experimental validation or asymmetric structures.
1：Experimental Design and Method Selection:
The study employs a theoretical modal expansion method to analyze SPP modes on bilayer graphene ribbon arrays, using Maxwell's equations and periodic boundary conditions.
2：Sample Selection and Data Sources:
The structure consists of bilayer graphene ribbon arrays separated by a dielectric gap, with parameters such as period p, ribbon width d, and gap width g. Graphene is modeled as an infinitesimally thin conductive sheet with surface conductivity derived from Kubo formula.
3：List of Experimental Equipment and Materials:
No specific equipment or materials are listed as the study is theoretical.
4：Experimental Procedures and Operational Workflow:
Field expressions are solved for different regions (I, II, III) based on boundary conditions, and analytical dispersion expressions are derived by eliminating unknown coefficients.
5：Data Analysis Methods:
The derived dispersion expressions are used to calculate and analyze SPP characteristics like propagation momentum and loss for different structural and graphene parameters.
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