Observation of intrinsic size effects in the optical response of individual gold nanoparticles.
The photothermal heterodyne imaging method is used to study for the first time the absorption spectra of individual gold nanoparticles with diameters down to 5 nm. Intrinsic size effects that result in a broadening of the surface plasmon resonance are unambiguously observed. Dispersions in the peak energies and homogeneous widths of the single-particle resonances are revealed. The experimental results are analyzed within the frame of Mie theory.
Berciaud
Stéphane
S
Centre de Physique Moléculaire Optique et Hertzienne, CNRS (UMR 5798) et Université Bordeaux I, 351, cours de la Libération, 33405 Talence Cedex, France.
Cognet
Laurent
L
Tamarat
Philippe
P
Lounis
Brahim
B
D006046:Gold / Q000032:analysis / Q000737:chemistry*; D006358:Hot Temperature; D008027:Light; D036103:Nanotechnology / Q000379:methods; D043942:Nanotubes / Q000032:analysis / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D020349:Surface Plasmon Resonance / Q000379:methods*
D006046:Gold