PERTREUX, Etienne; LOMBARDI, Anna; FLOREA, Ileana; SPUCH-CALVAR, Miguel; GÓMEZ-GRAÑA, Sergio; IHIAWAKRIM, Dris; HIRLIMANN, Charles; ERSEN, Ovidiu; MAJIMEL, Jérôme; TRÉGUER-DELAPIERRE, Mona; HETTICH, Mike; MAIOLI, Paolo; CRUT, Aurélien; VALLÉE, Fabrice; FATTI, Natalia Del

doi:10.1002/adom.201500548

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PERTREUX, Etienne
iLM - FemtoNanoOptics [iLM - FemtoNanoOptics]

LOMBARDI, Anna
iLM - FemtoNanoOptics [iLM - FemtoNanoOptics]

FLOREA, Ileana
Institut de Physique et Chimie des Matériaux de Strasbourg [IPCMS]

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Este ítem está publicado en

Advanced Optical Materials. 2016, vol. 4, n° 4, p. 567-577

Wiley

Resumen en inglés

Modification of the plasmonic response of a metal nano-object due to interaction with a substrate is experimentally investigated measuring the quantitative optical extinction spectra of individual nano-objects with various elongated shapes (bipyramids and rods) deposited on a dielectric (silica) or absorbing (carbon) membrane. Apart from the expected dependence of the nanoparticle surface plasmon resonance (SPR) frequency on the nature of the substrate, large substrate and particle shape dependent modifications of its SPR width are demonstrated. These dependencies are ascribed to strong localization of the electromagnetic field associated with the longitudinal SPR of an elongated nano-object around its tips, leading to different interaction with the substrate depending on the particle shape and 3D orientation relative to the substrate. Both parameters have been precisely determined by electron tomography, permitting excellent reproduction of the experimental data. Experiments performed on silver-encapsulated bipyramids, whose shape evolves from a pyramidal one towards a cylindrical one, further confirm this effect.< Leer menos

Palabras clave en inglés

spatial modulation spectroscopy

surface plasmon resonance

substrate effects

gold nano-objects

electron tomography

DOI

http://dx.doi.org/10.1002/adom.201500548

Proyecto ANR

Mécanismes d'évaluation de la robUstesse de Réseaux de capteurs par injection de fautes PHYsiques et logicielles. - ANR-10-BLAN-0306
Initiative d'excellence de l'Université de Bordeaux

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Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB) - UMR 5026