Surface plasmon resonance of an individual nano-object on an absorbing substrate : quantitative effects of distance and 3D orientation
Langue
en
Article de revue
Ce document a été publié dans
Advanced Optical Materials. 2016, vol. 4, n° 4, p. 567-577
Wiley
Résumé en anglais
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 ...Lire la suite >
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.< Réduire
Mots clés en anglais
spatial modulation spectroscopy
surface plasmon resonance
substrate effects
gold nano-objects
electron tomography
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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
Initiative d'excellence de l'Université de Bordeaux
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