Surface roughness effects on the broadband reflection for refractory metals and polar dielectrics

İrez, Lina and Şendur, Kürşat (2019) Surface roughness effects on the broadband reflection for refractory metals and polar dielectrics. Materials, 12 (19). ISSN 1996-1944

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Abstract

Random surface roughness and surface distortions occur inevitably because of various material processing and fabrication techniques. Tailoring and smoothing the surface roughness can be especially challenging for thermomechanically stable materials, including refractory metals, such as tungsten (W), and polar dielectrics, such as silicon carbide (SiC). The spectral reflectivity and emissivity of surfaces are significantly impacted by surface roughness effects. In this paper, we numerically investigated the surface roughness effects on the spectral reflectivity and emissivity of thermomechanically stable materials. Based on our results, we determined that surface roughness effects are strongly impacted by the correlation length of the Gaussian surface. In addition, our results indicate that surface roughness effects are stronger for the materials at the epsilon-near-zero region. Surface roughness effects are stronger between the visible and infrared spectral region for W and around the wavelength of 12 mu m for SiC, where plasma frequency and polar resonance frequency are located.
Item Type: Article
Uncontrolled Keywords: emissivity; surface roughness effects; polar dielectric; broadband reflection; optical properties; extreme environments
Divisions: Faculty of Engineering and Natural Sciences > Academic programs > Mechatronics
Faculty of Engineering and Natural Sciences
Depositing User: Kürşat Şendur
Date Deposited: 13 Apr 2020 17:23
Last Modified: 27 Jul 2023 21:25
URI: https://research.sabanciuniv.edu/id/eprint/39799

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