Surface Roughness Effects on the Broadband Reflection for Refractory Metals and Polar Dielectrics

Cao, Lina; Şendur, Kürşat

doi:10.3390/ma12193090

Cited by 20 publications

(8 citation statements)

References 58 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Random surface roughness and surface distortions occur inevitably because of various material processing and fabrication techniques which might affect the absorption peak [50,51]. Based on our previous experiences [34], these factors would not have a significant effect on the performance if an accurate fabrication process is used.…”

Section: Discussion and Resultsmentioning

confidence: 99%

Terahertz High-Q Absorber Based on Holes Array Perforated into a Metallic Slab

Barzegar-Parizi

Ebrahimi

2021

Electronics

View full text Add to dashboard Cite

In this paper, we theoretically analyze and design a dual-narrowband terahertz (THz) absorber based on a hole array drilled into a metallic slab. A very high-quality factor (Q) is achieved at both of the resonance frequencies. A circuit model-based approach is developed for the analysis and design of the proposed absorber. The absorption peaks occur at 2.46 and 3.75 THz frequencies with 98% and 96% absorptions at normal incidence, respectively. The achieved quality factors are 149 and 144, at 50% absorbance for the two absorption bands, respectively.

show abstract

Section: Discussion and Resultsmentioning

confidence: 99%

Terahertz High-Q Absorber Based on Holes Array Perforated into a Metallic Slab

Barzegar-Parizi

Ebrahimi

2021

Electronics

View full text Add to dashboard Cite

show abstract

“…In reality, different types of surface defects and roughness can manifest while using mechanical machining or material synthesizing processes, which result in different PSD spectra. Surface roughness is one of the important factors affecting the reflectivity/emissivity due to the incident angle change on different facets [ 52 ]. In the current study, random texture geometries are characterized by their statistical properties, height distribution, and correlation length.…”

Section: Methodsmentioning

confidence: 99%

Tungsten Based Spectrally Selective Absorbers with Anisotropic Rough Surface Texture

Pirouzfam

Şendur

2021

Nanomaterials

Self Cite

View full text Add to dashboard Cite

Spectrally selective absorbers have received considerable interest due to their applications in thermophotovoltaic devices and as solar absorbers. Due to extreme operating conditions in these applications, such as high temperatures, thermo-mechanically stable and broadband spectrally selective absorbers are of interest. This paper demonstrates anisotropic random rough surfaces that provide broadband spectrally selective absorption for the thermo-mechanically stable Tungsten surfaces. Anisotropic random rough surface has different correlation lengths in the x- and y-directions, which means their topography parameters have directional dependence. In particular, we demonstrate that spectral absorptance of Tungsten random rough surfaces at visible (VIS) and near-infrared (NIR) spectral regions are sensitive to correlation length and RMS height variations. Our results indicate that by optimizing random rough surface parameters, absorption values exceeding 95% can be obtained. Moreover, our results indicate that anisotropic random rough surfaces broaden the bandwidth of the high absorption region. It is shown that in VIS and NIR regions, the absorption enhancements of up to 47% and 52% are achieved for the isotropic and anisotropic rough surfaces, respectively.

show abstract

“…Tailoring the surface conditions is especially challenging for thermo-mechanically stable materials, including refractory metals, such as tungsten (W), and polar dielectrics, such as silicon carbide (SiC). Hence, recent numerical modelling of the surface roughness has focused on the effects on the spectral reflectivity and emissivity of such materials and shows a strong dependency on the correlation length of the Gaussian surface, (Cao and Sendur, 2019). Interface engineering optimisation occurs largely through trial and error (Röttger et al, 2022), Röttger et al define three central challenges that account for this disconnect: i) the fusion of many different types of measurement for the same surface to capture the multi-scale nature of roughness; ii) the technical complexity of implementing spectral analysis methods, and of applying mechanical or numerical models to describe surface performance; iii) a lack of consistency and compliance with ISO standards in how surfaces are measured, quantified, and communicated.…”

Section: Interface Engineeringmentioning

confidence: 99%

Grand challenges in coatings, dyes and interface engineering

Wood¹

2023

Front. Coat. Dye In.

View full text Add to dashboard Cite

The subject areas of Coatings, Dyes and Interface Engineering are rarely seen together although there is potentially a huge synergy from embracing coatings-dyes-interface interactions. This allows an enabling science that aligns with global grand challenges such as net zero (batteries, renewal energy systems, low drag, antifouling and low friction interfaces, self-healing coatings, functionally graded, composite and multi-layered coatings sustainability of coatings, etc.), biomedical/health technologies, space and security. Coatings, dyes and interfaces engineering are used to optimize the functionality and to improve the entire function of materials and surfaces. Coatings have a wide range of forms, such as paints, adhesives, semiconductor thin films, hard facings and have a varied application route such as mechanical systems, solar cells, domestic appliances, photonics, smart coatings, microelectronics, offshore renewables, biomedical and photographic films. Several application and synthesis methods, such as sol-gel, spin, dip, physical and chemical vapour deposition, thermal spray, weld overlays, plasma electrolytic oxidation, atomic layer deposition, electroplating and so on, have been used for thin or thick hard and soft coatings and films.This article looks at recent state-of-the-art and related special issues and review papers to identify trends and future challenges for research in these areas. In scope for embracing coatings-dyesinterface interactions are thin and thick, composite, hard and soft coatings, coating structure and properties, processes for coating deposition, modification and characterization techniques, functional, smart, self-healing and sensing coatings, dyes, pigments and their intermediates. These in turn rely on fundamental mechanical and chemical as well as functional properties of surfaces and interfaces, theoretical and computational modelling of surfaces and interfaces as well as colloids, nanoparticles and large interfaces. The key to improved performance of coatings-dyesinterface engineering is understanding the manufacturer-composition-properties-performance interactions aligned to the service environment and operating conditions. Such research will be essential for energy research, photovoltaics, battery and electrochemical surfaces, biomedical applications, electronic applications of dyes and pigments, low friction, efficient machines and low drag, hydrophobic and nature inspired coatings. However, new understanding is needed for dynamic interfaces covering wear, corrosion, erosion for example. Modern measurement and imaging systems now allow in-situ and non-destructive monitoring of these interfaces. Miniaturisation of sensors and embedding sensors alongside or within interfaces is now possible which should provide a digital data stream for machine learning algorithms to allow smart interface management. Therefore, the challenges now lie around the synthesis and characterization of thin films and multifunctional coatings and the use of novel interface characterization techniq...

show abstract

Surface Roughness Effects on the Broadband Reflection for Refractory Metals and Polar Dielectrics

Cited by 20 publications

References 58 publications

Terahertz High-Q Absorber Based on Holes Array Perforated into a Metallic Slab

Terahertz High-Q Absorber Based on Holes Array Perforated into a Metallic Slab

Tungsten Based Spectrally Selective Absorbers with Anisotropic Rough Surface Texture

Grand challenges in coatings, dyes and interface engineering

Contact Info

Product

Resources

About