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Phys Rev Lett. 2007 Apr 13;98(15):153902. Epub 2007 Apr 9.

Near-field analysis of surface waves launched at nanoslit apertures.

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1
Laboratoire Spectroscopie en Lumière Polarisée, UPR CNRS 5, ESPCI, 10 rue Vauquelin, 75231 Paris Cedex 5, France. aigouy@optique.espci.fr

Abstract

With the aim of analyzing the properties of the waves that are scattered by nanoslits on metallic surfaces, we provide a direct observation of the near-field in a slit-doublet experiment at optical wavelengths. We show that two distinct waves are involved: a surface plasmon polariton and another wave with a free-space character. From the recorded data, we have extracted the amplitudes and phases of these waves, their damping characteristic lengths and their relative weights as a function of the separation distance from the slit. The analysis is fully supported by a quantitative agreement with vector-theory computational results.

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