Two Addressable Dielectric Cavities in a Refractory Ti–Al₂O₃ Concentric-Ring Metamaterial Absorber for Ultra-Broadband Solar Absorption and 1000 K Thermal Emission
Description
This dataset contains simulated spectral data supporting the manuscript. All spectra were obtained by full-wave electromagnetic simulations using COMSOL Multiphysics under periodic boundary conditions, with plane-wave illumination normal to the structure unless otherwise stated. The dataset comprises three groups: (1) Absorption spectra of the proposed DMRA and control configurations (Case 1: dielectric auxiliary ring removed; Case 2: central Al₂O₃ cylinder removed; Case 3: both removed) over 300–4000 nm, quantifying the individual and combined contributions of the two dielectric cavities to the broadband response. (2) Parameter-sweep spectra, in which one geometric parameter (e.g., ring dimensions, cylinder radius/height, layer thicknesses, lattice constant) is varied around its optimized value while all others are fixed, supporting the fabrication-tolerance analysis. (3) Material-substitution spectra, in which the constituent metals or dielectrics (Ti, Al₂O₃) are replaced while the geometry is unchanged, supporting the material-selection discussion.
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Institutions
- Northwest Normal UniversityGansu, Lanzhou