研究目的
To design a near-field metasurface that overcomes the diffraction limit and superfocuses terahertz waves for applications in subwavelength resolution imaging, photolithography, and non-contact sensing.
研究成果
The proposed near-field metasurface successfully achieves superfocusing of terahertz waves with a FWHM of 0.067λ0 at a distance of 0.073λ0, demonstrating potential applications in super-resolution imaging and other near-field applications. The design methodology and simulation results provide a foundation for future experimental validation and optimization.
研究不足
The study is limited to simulations and theoretical designs; practical implementation and experimental validation are not discussed. The performance is also dependent on the precise fabrication of the metasurface unit cells.
1：Experimental Design and Method Selection:
The design involves arranging unit cells with super small electric sizes based on a back-propagation method and an effective-parameters retrieval algorithm.
2：Sample Selection and Data Sources:
The unit cells are designed with specific dimensions and materials to achieve the desired electromagnetic properties.
3：List of Experimental Equipment and Materials:
The unit cells are made of pure copper and FR-4 dielectric. Simulations are conducted using CST studio
4：Experimental Procedures and Operational Workflow:
20 The metasurface is designed to manipulate the amplitude and phase of terahertz waves to achieve superfocusing.
5：Data Analysis Methods:
The effectiveness of the metasurface is demonstrated through FDTD simulations, showing the electric field distribution and focusing performance.
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