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Proceedings Paper

Low-index metamaterials comprised of plasmonic dimers of aluminum-doped zinc oxide
Author(s): Hossein Alisafaee; P. MyCia Cox; Michael A. Fiddy
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Paper Abstract

Transparent conducting oxides (TCO) are an interesting class of plasmonic materials, which are under intensive study for their use in low-loss metamaterials and a range of applications such as sensing, imaging and transformation optics. Here, using both full-wave simulations and an equivalent circuit model for pairs of nanoparticles of aluminum doped zinc oxide (AZO), we study the plasmonic effects for low loss low index metamaterials for infrared applications. The behavior of localized surface plasmon resonances (LSPR) of AZO nanoparticle dimers embedded in a host polymer medium is investigated for different dimer orientations with respect to the indicent electromagnetic wave. In doing this, the role of dressed polarizability to enhance and quench the plasmonic effects is also considered. The effects of the nanoparticles relative size and the spacing between them are studied. Understanding these resonances and their dependence on dimer orientations, provides a means to design metamaterial structures for use in the near infrared (NIR) region with epsilon-near-zero properties leading also to low index metamaterials. In our studies, we demonstrate how nanospheres with radii less than 100 nm that are distributed with an average spacing less than their diameter, can result in an effective medium with refractive index less than one. We utilize a full-wave frequency domain finite element method in conjunction with an equivalent-circuit model for the nanoscale dimers in order to describe the spectral response of the bulk low index properties. We also present a statistical analysis to obtain the effective refractive index for incident light having different polarizations.

Paper Details

Date Published: 11 September 2013
PDF: 9 pages
Proc. SPIE 8806, Metamaterials: Fundamentals and Applications VI, 88061L (11 September 2013);
Show Author Affiliations
Hossein Alisafaee, Univ. of North Carolina at Charlotte (United States)
P. MyCia Cox, Univ. of North Carolina at Charlotte (United States)
Michael A. Fiddy, Univ. of North Carolina at Charlotte (United States)

Published in SPIE Proceedings Vol. 8806:
Metamaterials: Fundamentals and Applications VI
Allan D. Boardman; Nader Engheta; Mikhail A. Noginov; Nikolay I. Zheludev, Editor(s)

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