研究目的
Investigating the actively tunable toroidal excitations in graphene based terahertz metamaterials.
研究成果
The study successfully demonstrates the active tuning of toroidal resonances in graphene-based planar metamaterials by varying the Fermi energy and relaxation time of graphene. The findings suggest potential applications in designing tunable terahertz devices.
研究不足
The study focuses on the theoretical and numerical simulation aspects of toroidal excitations in graphene-based metamaterials. Experimental validation and fabrication challenges are not addressed.
1：Experimental Design and Method Selection:
The study involves designing a graphene-based planar metamaterial geometry that results in toroidal excitation at terahertz frequency. The methodology includes numerical simulations using the technique of finite element frequency domain solver in CST Microwave Studio.
2：Sample Selection and Data Sources:
The proposed metamaterial array consists of an array of two joint resonators (SRRs) made of graphene with two split gaps in each resonator. The substrate is made of intrinsic silicon.
3：List of Experimental Equipment and Materials:
The study uses graphene material for the split ring resonators and intrinsic silicon for the substrate.
4：Experimental Procedures and Operational Workflow:
The metamaterial geometry is simulated under the unit cell boundary conditions in the xy plane with open boundary conditions along the direction of light propagation.
5：Data Analysis Methods:
The transmittance characteristics of the proposed MM structure are examined by varying the Fermi energy and relaxation time of the graphene material.
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