30 June 1999 Surface plasmon polaritons on metal surfaces with nanometer-scaled roughness
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Abstract
We describe experimental measurements of the optical scattering properties of metallic surfaces with nanometer- scaled roughness. The surfaces are fabricated using microlithographic techniques and are fully characterized with surface profilometry. The surface roughness is carefully designed so that when illuminated with laser light, surface plasmon polaritons are strongly excited; these are then again scattered by the roughness and converted into diffuse light escaping from the surface. In the diffuse scatter, unusual features are observed that are attributed to the plasmon polariton excitation. For example, backscattering enhancement arising from constructive interference between polariton-related scattering processes dominates the scattering distribution in some cases. Also discussed are experimental results for second harmonic generation from rough metal surfaces, where the consequences of polariton excitation at both the fundamental and harmonic frequencies are observed. If the surface producing strong fundamental plasmon excitation lead to stronger harmonic generation and quite different scattering distributions. Finally, experiments with quasiperiodic surfaces, both in the linear and second-harmonic cases, produce effects that are shown to be related to those observed with rough surfaces.
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Kevin A. O'Donnell, Kevin A. O'Donnell, } "Surface plasmon polaritons on metal surfaces with nanometer-scaled roughness", Proc. SPIE 3790, Engineered Nanostructural Films and Materials, (30 June 1999); doi: 10.1117/12.351240; https://doi.org/10.1117/12.351240
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