Premium
Surface Plasmon Resonance of an Individual Nano‐Object on an Absorbing Substrate: Quantitative Effects of Distance and 3D Orientation
Author(s) -
Pertreux Etienne,
Lombardi Anna,
Florea Ileana,
SpuchCalvar Miguel,
GómezGraña Sergio,
Ihiawakrim Dris,
Hirlimann Charles,
Ersen Ovidiu,
Majimel Jérôme,
TréguerDelapierre Mona,
Hettich Mike,
Maioli Paolo,
Crut Aurélien,
Vallée Fabrice,
Fatti Natalia Del
Publication year - 2016
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.201500548
Subject(s) - materials science , plasmon , substrate (aquarium) , surface plasmon resonance , surface plasmon , particle (ecology) , optics , nanoparticle , localized surface plasmon , dielectric , molecular physics , optoelectronics , nanotechnology , chemistry , physics , oceanography , geology
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.