Light scattering from realistic random rough metallic surfaces with superimposed periodic textures has been considered on the basis of the Kirchhoff wave scattering theory for smoothly varying surfaces. The theory is conventional and does not contribute to the intensively investigated case of roughness on the nanometer (or atomic) scale. It has been demonstrated that the presence of a regular structure on a metallic surface can change the relation between coherent (grating) and incoherent (diffuse) scattering to favor grating. For the smooth periodic structure, the ratio of coherent to incoherent scattering intensities grows linearly with the parameter (K·λ0), where K is the wave vector of the periodic structure and λ0 is the correlation length for random roughness. The surface height h of the periodic structure plays a less important role in the suppression of the diffuse scattering, but it gives an oscillating term in grating scattering intensity that can produce the "rainbowing" (or coloration) effect for such a surface. In practice, this may result in increased visual brightness of textured metallic surfaces and also in a new and interesting method of surface coloration control. The rapid development of focused beam texturing technologies leaves no doubt that patterns with a given spatial frequency and amplitude can be easily produced in experiments.
|Number of pages||7|
|Journal||Applied Physics B: Lasers and Optics|
|Publication status||Published - 1 Dec 1998|
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)
- Atomic and Molecular Physics, and Optics