ph6b00520_si_001.pdf (1.09 MB)
Second-Harmonic Scattering from Metallic Nanoparticles in a Random Medium
journal contribution
posted on 2017-01-03, 00:00 authored by Naima Khebbache, Anthony Maurice, Smail Djabi, Isabelle Russier-Antoine, Christian Jonin, Sergey E. Skipetrov, Pierre-François BrevetWe
report the second-harmonic scattering intensity from silver
nanoparticles dispersed in a linear random medium. The medium is formed
by an aqueous solution of 80 nm diameter silver nanoparticles acting
as nonlinear optical sources and 200 nm diameter latex nanospheres
used as scattering centers. At photon scattering mean free paths longer
than the ballistic photon path length, the second-harmonic intensity
decreases exponentially due to the linear scattering of both the fundamental
and harmonic beams. However, below a critical photon scattering mean
free path, the decrease of the nonlinear optical intensity levels
off. Polarization analysis further provides details about the transition
from the ballistic to scattered second-harmonic photons. Because of
the incoherent nature of the second-harmonic scattering process, we
suggest that a lengthening of the interaction time of the fundamental
photons with the nonlinear medium occurs.