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Proceedings Paper

Broadband epsilon-near-zero metamaterials based on metal-polymer composite thin films
Author(s): Pavlo Pinchuk; Ke Jiang
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Paper Abstract

Epsilon-near-zero (ENZ) metamaterials are designed to exhibit a near-zero response for the real part of the dielectric permittivity at a given frequency or in a specific frequency range. Typically, this frequency range is relatively small. In this paper, we present an approach to broaden this range by controlling the size of the nanoparticles embedded in a thin film. Noble metal nanoparticles exhibit an external size effect that redshifts the Surface Plasmon Resonance frequency with an increase of the size of the particles. The absorption spectrum of a material can be directly related to its dielectric permittivity via the Kramers-Kronig relations. We use the Kramers-Kronig relations to retrieve the complex effective dielectric permittivity of a composite film, which is designed to exhibit ENZ behavior over a broad frequency range. We synthesize a composite thin film embedded with metal nanoparticles of a broad size distribution. Such a material exhibits a broad SPR, and, in turn, broadband ENZ behavior.

Paper Details

Date Published: 9 October 2015
PDF: 7 pages
Proc. SPIE 9545, Nanophotonic Materials XII, 95450W (9 October 2015); doi: 10.1117/12.2187283
Show Author Affiliations
Pavlo Pinchuk, Univ. of Colorado at Colorado Springs (United States)
Ke Jiang, Univ. of Colorado at Colorado Springs (United States)

Published in SPIE Proceedings Vol. 9545:
Nanophotonic Materials XII
Stefano Cabrini; Gilles Lérondel; Adam M. Schwartzberg; Taleb Mokari, Editor(s)

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