期刊
SURFACE SCIENCE REPORTS
卷 64, 期 10, 页码 453-469出版社
ELSEVIER
DOI: 10.1016/j.surfrep.2009.07.003
关键词
Sub-lambda metallic surfaces; Surface plasmon polaritons; Quasi-cylindrical waves; Plasmonics; Extraordinary optical transmission; Diffraction; Multiple scattering
We review the properties of the surface waves that are scattered by two-dimensional sub-lambda 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 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. (c) 2009 Elsevier B.V. All rights reserved.
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