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Surface Plasmons on Thin, Metallic Films

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Surface modes occur on interfaces between materials with dielectric functions of opposing signs. We consider the case of flat metallic layers which are described by the Drude model. The surface modes can be derived from the continuity conditions and show a confinement of the field at the surface of the layer. We demonstrate that it is essential to study realistic material parameters regarding absorption as the damping of the metal changes the properties of surface plasmons compared to non-absorbing (=perfect) metals. Next to studying the coupling between top and bottom interface of one metallic layer we investigate also the coupling of surface plasmons towards adjacent layers. Here, the knowledge of the field distribution is essential to find the optimal distance between two parallel sheets for enhancing the propagation length, respectively reducing the damping. Finally we determine phase and group velocity and the energy flux to investigate possible negative refraction in such thin layer systems.
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Keywords: METALLIC FILMS; NEGATIVE DISPERSION; SURFACE STATES

Document Type: Research Article

Publication date: 2009-03-01

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  • Journal of Computational and Theoretical Nanoscience is an international peer-reviewed journal with a wide-ranging coverage, consolidates research activities in all aspects of computational and theoretical nanoscience into a single reference source. This journal offers scientists and engineers peer-reviewed research papers in all aspects of computational and theoretical nanoscience and nanotechnology in chemistry, physics, materials science, engineering and biology to publish original full papers and timely state-of-the-art reviews and short communications encompassing the fundamental and applied research.
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