Diffuse light bands for p and s polarization in microrough diffraction gratings

Year: 1994

Authors: Brudny V.L., Iemmi C.C., Ledesma S.A.

Autors Affiliation: Univ. Buenos Aires, Fac. cienc. exactas naturales, dep. física, 1428 Buenos Aires, Argentine;
Istituto Nazionale di Ottica, Largo E. Fermi 6, 50125 Firenze, Italy

Abstract: We present here experimental evidence of the existence of a distinct band pattern in the diffuse background generated by the scattering of light on a micro-rough diffraction grating for both polarizations of the incident light. This sort of pattern (”diffuse light bands”) has been previously observed and studied for p-polarized incidence, but not for s-polarized. The band structure possesses similar features for both polarizations. The pattern for p-polarized incident light can be explained in terms of surface plasmon interaction with the random roughness existing on the grating; however, the mechanisms that generate the band structure for s-polarized incidence cannot be as easily identified. We discuss some possible mechanisms that include the existence of s-polarized surface excitations on a 1-D modulated structure

Journal/Review: OPTIK

Volume: 97 (1)      Pages from: 23  to: 30

KeyWords: Diffraction gratings; Roughness; Microroughness; Rough surface; Polarization

Citations: 1
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