研究目的
To design and evaluate a multi-band terahertz metamaterial with polarization sensitivity and angle independence for applications in sensing and multi-spectral imaging.
研究成果
The designed metamaterial exhibits five resonant bands with polarization-dependent and angle-independent transmission characteristics, making it suitable for sensing and multi-spectral imaging applications. The resonances are attributed to dipolar, multi-polar, and surface plasmonic excitations, as confirmed by electric field analysis.
研究不足
The study is based on numerical simulations without experimental validation; fabrication and real-world performance are not addressed. The structure's sensitivity to polarization may limit applications requiring isotropic response, and the specific material choices (e.g., Teflon substrate) could impose constraints in harsh environments.
1：Experimental Design and Method Selection:
The study uses numerical simulations with CST Microwave Studio software to design and analyze a metamaterial unit cell composed of two hexagonal metallic resonators on a Teflon dielectric substrate. The finite difference time domain (FDTD) solver is employed for simulations.
2：Sample Selection and Data Sources:
The unit cell is designed with specific geometric parameters (e.g., P =
3：5 mm, r1 = 180 μm, r2 = 240 μm, w = 30 μm) and material properties (copper conductivity 8e7 S/m, Teflon dielectric constant 06 + 0004i). List of Experimental Equipment and Materials:
Software: CST Microwave Studio; Materials: Copper for resonators, Teflon for substrate.
4：Experimental Procedures and Operational Workflow:
The structure is illuminated by a terahertz plane wave with x-polarized electric field propagating along z-direction. Unit cell boundary conditions are applied. Transmission characteristics are evaluated for TE and TM modes, varying angles of incidence (0° to 45° in 15° steps), and different gap sizes between resonators.
5：Data Analysis Methods:
Electric field distributions (abs(E) and real(Ez)) are analyzed at resonant frequencies to understand the mechanisms of multi-band resonances, including dipolar, multi-polar, and surface plasmonic effects.
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