研究目的
To design and numerically investigate a wide-angle and polarization-insensitive ultrabroadband metamaterial absorber for the visible and near-infrared region, aiming for high absorptivity and practical feasibility.
研究成果
The proposed metamaterial absorber achieves over 90% absorptivity from 480 to 1480 nm with a 102% bandwidth, maintains performance up to 60° incident angles for both polarizations, and is polarization-insensitive due to rotational symmetry. It offers improved compactness and feasibility for applications like solar energy harvesting and thermal emitters.
研究不足
The study is based on numerical simulations and has not been experimentally validated; fabrication challenges such as achieving smooth surfaces and precise layer deposition are noted as potential limitations.
1：Experimental Design and Method Selection:
The study uses numerical modeling with CST Microwave Studio software to simulate the absorption performance. The design is based on a periodic array of metallic-dielectric multilayered conical frustums, optimized for impedance matching and resonance control.
2：Sample Selection and Data Sources:
The unit cell parameters are optimized through iterative modeling, with materials selected as gold for metallic layers and silicon for dielectric layers.
3：List of Experimental Equipment and Materials:
Software (CST Microwave Studio), materials (gold with conductivity
4：561×10^7 S/m, silicon with relative dielectric constant 9). Experimental Procedures and Operational Workflow:
The boundary conditions are set with X- and Y-axes fixed and Z-axis open; absorption is calculated as A(ω) = 1 - R(ω) - T(ω), with T(ω) = 0 due to the metallic ground layer.
5：Data Analysis Methods:
Absorption spectra, field distributions, and performance metrics like bandwidth and average absorption are analyzed using the software's frequency domain solver.
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