研究目的
Investigating the nonreciprocal grating based on graphene strips for THz frequencies to achieve strong nonreciprocity with moderate insertion loss.
研究成果
The paper introduces a new form of nonreciprocal THz gratings based on graphene and spatiotemporal modulation, showing that such structures can provide large isolation with moderate loss for practically feasible material parameters, making them suitable for practical applications.
研究不足
The study is limited to THz frequencies and relies on realistic material parameters for graphene, which may not cover all potential applications or materials.
1：Experimental Design and Method Selection:
The study employs an analytical method for the analysis of the structure, using quasi-static current distributions for the modes of the graphene strips. This method facilitates a fast analysis and efficient design of the structure.
2：Sample Selection and Data Sources:
The structure consists of a periodic array of graphene strips on top of a dielectric substrate with a metallic ground plane at the bottom.
3：List of Experimental Equipment and Materials:
Graphene strips, dielectric substrate (approximating silicon), metallic ground plane.
4：Experimental Procedures and Operational Workflow:
The graphene strips are modulated with a different phase, and the excitation is assumed to be a plane wave with a specific frequency and incident angle.
5：Data Analysis Methods:
The method has been compared with numerical simulations based on the finite-element method conducted through the numerical software COMSOL.
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