TY - JOUR
T1 - Effective permittivity of dense random particulate plasmonic composites
AU - Wani, Satvik N.
AU - Sangani, Ashok S.
AU - Sureshkumar, Radhakrishna
N1 - Copyright:
Copyright 2014 Elsevier B.V., All rights reserved.
PY - 2012/6
Y1 - 2012/6
N2 - An effective-medium theory (EMT) is developed to predict the effective permittivity ε eff of dense random dispersions of high optical-conductivity metals such as Ag, Au, and Cu. Dependence of εeff on the volume fraction ø, a microstructure parameter-related to the static structure factor and particle radius a, is studied. In the electrostatic limit, the upper and lower bounds of k correspond to Maxwell-Garnett and Bruggeman EMTs, respectively. Finite size effects are significant when jβ2(ka/n)3 becomes O(1), where β, k, and n denote the nanoparticle polarizability, wavenumber, and matrix refractive index, respectively. The coupling between the particle and effective medium results in a red-shift in the resonance peak, a nonlinear dependence of εeff on ø, and Fano resonance in εeff .
AB - An effective-medium theory (EMT) is developed to predict the effective permittivity ε eff of dense random dispersions of high optical-conductivity metals such as Ag, Au, and Cu. Dependence of εeff on the volume fraction ø, a microstructure parameter-related to the static structure factor and particle radius a, is studied. In the electrostatic limit, the upper and lower bounds of k correspond to Maxwell-Garnett and Bruggeman EMTs, respectively. Finite size effects are significant when jβ2(ka/n)3 becomes O(1), where β, k, and n denote the nanoparticle polarizability, wavenumber, and matrix refractive index, respectively. The coupling between the particle and effective medium results in a red-shift in the resonance peak, a nonlinear dependence of εeff on ø, and Fano resonance in εeff .
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U2 - 10.1364/JOSAB.29.001443
DO - 10.1364/JOSAB.29.001443
M3 - Article
AN - SCOPUS:84861819118
VL - 29
SP - 1443
EP - 1455
JO - Journal of the Optical Society of America B: Optical Physics
JF - Journal of the Optical Society of America B: Optical Physics
SN - 0740-3224
IS - 6
ER -