Effective permittivity of dense random particulate plasmonic composites

doi:10.1364/JOSAB.29.001443

Journal of the Optical Society of America B

| OPTICAL PHYSICS

Editor: Henry van Driel
Vol. 29, Iss. 6 — Jun. 1, 2012
pp: 1443–1455

Effective permittivity of dense random particulate plasmonic composites

Satvik N. Wani, Ashok S. Sangani, and Radhakrishna Sureshkumar »View Author Affiliations

JOSA B, Vol. 29, Issue 6, pp. 1443-1455 (2012)
http://dx.doi.org/10.1364/JOSAB.29.001443

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Abstract

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 $ε_{eff}$ on the volume fraction $ϕ$ , a microstructure parameter $κ$ related to the static structure factor and particle radius $a$ , is studied. In the electrostatic limit, the upper and lower bounds of $κ$ correspond to Maxwell–Garnett and Bruggeman EMTs, respectively. Finite size effects are significant when $| β^{2} {(k a / n)}^{3} |$ 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 $ε_{eff}$ on $ϕ$ , and Fano resonance in $ε_{eff}$ .

OCIS Codes
(160.4670) Materials : Optical materials
(260.2110) Physical optics : Electromagnetic optics
(260.3910) Physical optics : Metal optics
(260.5740) Physical optics : Resonance
(260.2065) Physical optics : Effective medium theory
(160.4236) Materials : Nanomaterials

ToC Category:
Materials

History
Original Manuscript: February 14, 2012
Manuscript Accepted: March 24, 2012
Published: May 30, 2012

Citation
Satvik N. Wani, Ashok S. Sangani, and Radhakrishna Sureshkumar, "Effective permittivity of dense random particulate plasmonic composites," J. Opt. Soc. Am. B 29, 1443-1455 (2012)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-29-6-1443

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Journal of the Optical Society of America B

| OPTICAL PHYSICS

Effective permittivity of dense random particulate plasmonic composites

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