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.
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
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