https://doi.org/10.1140/epjd/e2007-00112-y
Optical extinction spectroscopy of single silver nanoparticles
1
LASIM, CNRS, Université Lyon 1, 43 boulevard du 11 novembre 1918, 69622 Villeurbanne, France
2
CPMOH, CNRS, Université Bordeaux 1, 351 cours de la Liberation, 33405 Talence, France
Corresponding author: a vallee@lasim.univ-lyon1.fr
Received:
4
August
2006
Revised:
30
October
2006
Published online:
24
May
2007
The extinction spectrum of single silver nanoparticles with size ranging from 20 to 80 nm is investigated with the spatial modulation spectroscopy technique using either a tunable laser or a white lamp as the broadband source. Results are in good agreement with the prediction of the Mie theory, permitting to extract the nanoparticle size from the measured absolute value of the optical extinction cross-section. In contrast, the deduced refractive index of the nanoparticle environment and the reduction of the electron mean free path show a large dependence on the precise value of the bulk silver dielectric function.
PACS: 78.67.-n – Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures / 78.67.Bf – Nanocrystals and nanoparticles / 78.40.-q – Absorption and reflection spectra: visible and ultraviolet / 78.40.Kc – Metals, semimetals, and alloys
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2007
