研究目的
To propose and demonstrate highly efficient terahertz waveplates using all-dielectric metamaterials composed of silicon brick arrays, enabling polarization control with close to unity transmission and large phase delay.
研究成果
The study successfully demonstrates highly efficient terahertz waveplates using all-dielectric metamaterials, achieving near unity transmission and large phase delays through multipolar interference. This approach offers a robust method for designing low-loss, functional, and compact terahertz meta-devices.
研究不足
The study is limited by the fabrication precision of silicon brick arrays and the inherent material properties of silicon. The influence of the substrate on transmission performance is noted, suggesting the need for low-loss materials with lower refractive indices for future optimizations.
1：Experimental Design and Method Selection:
The study employs anisotropic silicon brick arrays designed to support multiple Mie-type resonances for terahertz wave manipulation. The finite-difference-time-domain method is used for numerical simulation.
2：Sample Selection and Data Sources:
Silicon bricks with specific dimensions are arranged in a square lattice. The dimensions and arrangement are optimized for high transmission and large phase delay.
3：List of Experimental Equipment and Materials:
Silicon bricks with permittivity of 11.7, arranged in a square lattice with a periodicity of 150 μm.
4：7, arranged in a square lattice with a periodicity of 150 μm.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: A broadband terahertz wave is illuminated on the structure in the z direction. The internal current density and scattering cross sections are calculated to analyze the multipolar interference effects.
5：Data Analysis Methods:
Spherical multipole decomposition is used to calculate the scattering cross sections contributed by various modes. The performance of the waveplates is evaluated based on transmission coefficients and phase delay.
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