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22 January 2010 Near-field analysis of surface waves generated by nanostructures
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By Scanning Near-field Optical Microscopy (SNOM), we study the propagation of surface waves created by nanostructures on a thin gold film. The nanostructures are slits and ridges fabricated by electron or ion beam lithography techniques. We will first show that the light scattered by a slit made in a gold film illuminated in transmission is composed of two components: a diffracted field and a surface plasmon polariton that propagates on the gold surface over several tens of nanometers. When two slits are illuminated, the created waves encounter and form an interference pattern which involves both the surface plasmon polariton and the diffracted waves. The situation is more complicated when the nanostructures are illuminated in a reflection mode at oblique incidence. In that case, the created waves are superimposed to the incident and reflected fields. Despite a larger number of waves, the analysis of the interference pattern provides several informations on the nature of the scattered waves and their generation rate. In this article, we provide a qualitative analysis of the waves created by slits, and by linear and curved ridges located on a gold surface.
© (2010) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Loïc Lalouat, Laurent Billot, Elika Saïdi, Lionel Aigouy, Bing Wang, Philippe Lalanne, Eric Bourhis, Jacques Gierak, and Véronique Mathet "Near-field analysis of surface waves generated by nanostructures", Proc. SPIE 7608, Quantum Sensing and Nanophotonic Devices VII, 76080V (22 January 2010);

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