A microscopic view of the electromagnetic properties of sub-wavelength metallic surfaces

Details A microscopic view of the electromagnetic properties of sub-wavelength metallic surfaces A microscopic view of the electromagnetic properties of sub-wavelength metallic surfaces

2009-09-11

arxiv.org/abs/0909.2123v1

Physics

Condensed Matter

Other Condensed Matter

Review article, 98 references. Sur. Sc. Rep. (in press)

Scientific paper

10.1016/j.surfrep.2009.07.003

We review the properties of the surface waves that are scattered by two-dimensional sub-wavelength indentations on metallic surfaces. We show that two distinct waves are involved, a surface plasmon polariton (SPP) and a quasi-cylindrical wave (quasi-CW). We discuss the main characteristics of these waves, their damping characteristic lengths and their relative excitation weights as a function of the separation distance from the indentation and as a function of the metal conductivity. In particular we show that derive a closed-form expression for the quasi-CW, which clarifies its physical origin and its main properties. We further present an intuitive microscopic model, which explains how the elementary SPPs and quasi-CWs exchange their energies by multiple-scattering to build up a rich variety of near- and far-field optical effects.

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