title: Size-dependent surface plasmon resonance broadening in nonspherical nanoparticles: single gold nanorods.
abstract: The dependence of the spectral width of the longitudinal localized surface plasmon resonance (LSPR) of individual gold nanorods protected by a silica shell is investigated as a function of their size. Experiments were performed using the spatial modulation spectroscopy technique that permits determination of both the spectral characteristics of the LSPR of an individual nanoparticle and its morphology. The measured LSPR is shown to broaden with reduction of both the nanorod length and its diameter, which is in contrast with the predictions of existing classical and quantum theoretical models. This behavior can be reproduced assuming the LSPR width linearly depends on the inverse of an effective length proportional to the square root of the particle surface with the same slope as that recently determined for silica-coated silver nanospheres.
authors.affiliation: FemtoNanoOptics group, Institut Lumière Matière UMR5306, Université Lyon 1-CNRS, 69622 Villeurbanne, France.
authors.forename: Vincent
authors.initials: V
authors.lastname: Juvé
authors.forename: M Fernanda
authors.initials: MF
authors.lastname: Cardinal
authors.forename: Anna
authors.initials: A
authors.lastname: Lombardi
authors.forename: Aurélien
authors.initials: A
authors.lastname: Crut
authors.forename: Paolo
authors.initials: P
authors.lastname: Maioli
authors.forename: Jorge
authors.initials: J
authors.lastname: Pérez-Juste
authors.forename: Luis M
authors.initials: LM
authors.lastname: Liz-Marzán
authors.forename: Natalia
authors.initials: N
authors.lastname: Del Fatti
authors.forename: Fabrice
authors.initials: F
authors.lastname: Vallée
mesh_terms: D006046:Gold / Q000737:chemistry*; D053758:Nanoparticles / Q000737:chemistry*; D043942:Nanotubes / Q000737:chemistry*; D010316:Particle Size; D012822:Silicon Dioxide / Q000737:chemistry*; D020349:Surface Plasmon Resonance; D013499:Surface Properties
chemical_list: D006046:Gold; D012822:Silicon Dioxide