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| Spectral Selective Absorption of Randomly Rough Chromium (Cr) Surfaces: Simulation of Absorptivity and Emissivity |
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Abstract A solar thermal selective absorption coating based on randomly rough chromium (Cr) surfaces is proposed. The absorptivity and emissivity of the coating were simulated using the finite-difference time-domain (FDTD) method, revealing excellent spectral selective absorption performance. In the wavelength range of 0.3–2.1 μm, the Cr randomly rough surface achieved broadband absorption, with an average absorptivity exceeding 96%, while in the 2.5–10 μm range, the emissivity was below 0.25. Compared to periodic microstructures, the randomly rough surface demonstrated higher absorption efficiency and lower fabrication requirements, making it promising for production via mechanical processing. The effects of surface roughness, correlation length, incidence angle, and azimuth on absorptivity and emissivity were further investigated. The results indicate that the absorptivity remained above 90% within an incidence angle range of 0-50°, suggesting potential applications in solar thermal absorption coatings.
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Received: 01 November 2024
Published: 03 April 2025
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2025, Vol. 46 
