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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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Laboratoire Spectroscopie en Lumière Polarisée, UPR CNRS 5, ESPCI, 10 rue Vauquelin, 75231 Paris Cedex 5, France.


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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