研究目的
Investigating the absorbing performance of periodic double-layer graphene ring arrays separated by dielectric spacer for terahertz regime applications.
研究成果
The proposed dual-frequency absorber with periodic double-layer graphene ring arrays separated by dielectric spacer achieves perfect absorption for terahertz frequency. The peak positions can be affected by the outer radius of ring, the period length, and the dielectric layer thickness, and can be easily tuned by changing external bias voltage without changing the structural parameters.
研究不足
The study is conducted from the perspective of simulation and does not consider experimental realization, although the feasibility of experiment is analyzed.
1：Experimental Design and Method Selection:
The study uses coupled-mode theory (CMT) and finite difference time domain (FDTD) method to analyze the perfect absorption and the absorption mechanism.
2：Sample Selection and Data Sources:
The structure is composed of periodic double-layer graphene rings, sandwiched in the dielectric layers.
3：List of Experimental Equipment and Materials:
The dielectric layer is silica with the refractive index of
4：The substrate is gold with the conductivity of 56×10^7 S/m. Experimental Procedures and Operational Workflow:
3D FDTD method with grid size of 2 nm × 2 nm × 2 nm is used to investigate the absorption property.
5：Data Analysis Methods:
The propagation property of the proposed structure is investigated by CMT.
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