Accession Number : ADA308128

Title :   Enhanced Backscattering from Very Smooth Metal Surfaces,

Corporate Author : SURFACE OPTICS CORP SAN DIEGO CA

Personal Author(s) : Gu, Zu-Han ; Bennett, Jean

Report Date : 1995

Pagination or Media Count : 10

Abstract : One of the most interesting phenomena associated with the scattering of light from a randomly rough surface is that of enhanced backscattering. This is the presence of a well defined peak in the retroreflection direction in the angular distribution of the intensity of the incoherent component of the light scattered from such a surface. It is due primarily to the coherent interference of each multiply reflected optical path with its time reversed partner. The enhanced backscattering of light from a randomly rough surface was predicted in the scattering of p-polarized light from a 1-D random metal surfaces, when the plane of incidence was perpendicular to the generators of the surface. The calculation employed lower order perturbation theory and was limited to weakly corrugated surfaces. To test the theory, recent experimental investigation of scattering from very shallow randomly rough characterized Gold surfaces shows the enhanced backscattering phenomenon. The far field measurements and characterization of the surfaces are presented and compared with analytical results. It is believed that the mechanism responsible for the enhanced backscattering phenomenon is due to the large slope of the very smooth metallic surface.

Descriptors :   *LIGHT SCATTERING, *SURFACE ROUGHNESS, *BACKSCATTERING, *OPTICAL RETROREFLECTION, OPTICAL RADAR, METALS, REPRINTS, MEASUREMENT, COHERENCE, FAR FIELD, PROBABILITY DENSITY FUNCTIONS, INCOHERENCE, INTERFERENCE, PERTURBATION THEORY, GOLD, CORRUGATING.

Subject Categories : Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE