A ray-tracing analysis of the absorption of light by smooth and rough metal surfaces

Ray tracing has been employed to investigate the absorption of light by smooth and random rough metal surfaces. For normally incident light the absorptance of the surface increases with surface roughness. However, for light incident at a tangent to the surface the absorptance-surface roughness relat...

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Bibliographic Details
Published in:Journal of applied physics 2007-06, Vol.101 (11), p.113504
Main Authors: Bergström, D., Powell, J., Kaplan, A. F. H.
Format: Article
Language:English
Subjects:
Manufacturing Systems Engineering
Materials science
Produktionsutveckling
TECHNOLOGY
TEKNIKVETENSKAP
Teknisk materialvetenskap
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Summary:Ray tracing has been employed to investigate the absorption of light by smooth and random rough metal surfaces. For normally incident light the absorptance of the surface increases with surface roughness. However, for light incident at a tangent to the surface the absorptance-surface roughness relationship is more complex. For example, in certain cases the absorptance can rise, fall, and rise again as the surface roughness increases. In this paper this complex absorptance-roughness relationship is defined and explained. The wavelengths of the light chosen for this study correspond to the primary and secondary output wavelengths of Nd:YAG lasers.
ISSN:0021-8979
1089-7550
1089-7550
DOI:10.1063/1.2738417