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Dresden 2011 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 8: Photonics 1

Q 8.8: Talk

Monday, March 14, 2011, 12:15–12:30, SCH A215

Imaging in 3D the scattering pattern of plasmonic nanostructures by digital heterodyne holography — •Sarah Yasmine Suck1,2, Stéphane Collin3, Yannick De Wilde1, and Gilles Tessier11Institut Langevin, ESPCI ParisTech, CNRS, 10 rue Vauquelin, 75231 Paris, France — 2Fondation Pierre-Gilles de Gennes pour la Recherche, 29 rue d'Ulm, 75005 Paris, France — 3CNRS-LPN, Route de Nozay, 91460 Marcoussis, France

Nanoantennas are the direct extension of conventional radio and microwave antennas to the visible frequency range and can be used to convert optical radiation into localized energy and resonantly enhance light scattering. Here, we present a highly sensitive full-field imaging technique based on digital heterodyne holography which allows measuring both amplitude and phase for the 3D mapping of light scattered by plasmonic nanostructures at specific resonance wavelengths.

Various gold nanostructures, i.e. chains of nanodisks, single nanorods and nanodimers, were fabricated on a glass substrate with different lengths and spacings. After a spectroscopic study, the 3D far field phase and amplitude distributions of those antennas at resonance were measured at two laser wavelengths (λ1=658nm and λ2=785nm), and the 3D cartography of the scattered light of the nanostructures is reconstructed. As an example, using this technique we identify typical features of a nanodisk chain in resonant configuration: appearance of angular radiation lobes and a strong forward scattering perpendicular to the sample plane. Thus, this method provides an accurate spatial characterization of the signature of a nanostructure.

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