研究目的
Investigating the design and performance of a dual-band perfect metamaterial absorber based on rectangular cavities in the terahertz region, with wide incidence angle and high absorption rates.
研究成果
The proposed rectangular cavity-based perfect dual-band absorber demonstrates high absorption rates in two distinct terahertz bands and maintains performance over a wide incidence angle. The study provides a formula for calculating resonant frequencies, which aligns well with simulation results, offering a design guideline for similar MAs. The physical mechanism of absorption is explained through E-field distribution and standing wave theory, suggesting potential for broadband absorption by increasing the number of resonant cavities.
研究不足
The study focuses on TM polarization waves and the design's performance under oblique incidence angles, while the effect of other polarizations and extreme angles beyond 60° are not extensively explored. Additionally, the practical fabrication and experimental validation of the proposed MA are not discussed.
1：Experimental Design and Method Selection:
The study proposes a metamaterial absorber (MA) design based on rectangular cavities for dual-band absorption in the terahertz region. The design utilizes three different size rectangular cavities placed vertically on a metal plate. The simulation was performed using CST Microwave Studio 2016 based on finite integration technique.
2：Sample Selection and Data Sources:
The unit cell of the MA consists of a gold plate and three rectangular resonators. The permittivity data of the gold are infinite, and the dielectric constant and dielectric loss tangent of the dielectric in rectangular resonators are specified.
3：List of Experimental Equipment and Materials:
The materials used include gold for the plate and resonators, with specified electric conductivity and permittivity. The dielectric in the resonators has a dielectric constant of 3.75 and a dielectric loss tangent of 0.
4：75 and a dielectric loss tangent of Experimental Procedures and Operational Workflow:
0004.
4. Experimental Procedures and Operational Workflow: The simulation setup includes periodic unit cell boundary conditions in x and y directions, with the plane incident EM linearly polarized wave propagating along the +z direction. Absorption is calculated based on reflectance measurements.
5：Data Analysis Methods:
The absorption ability is calculated by A(ω) = 1 ? |S11|^2, where S11 is the reflection coefficient. The resonant frequencies are calculated using a derived formula based on rectangular cavity theory.
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