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Title:Investigation on Double Negative Metamaterials
Author(s):To, Oscar
Contributor(s):Kim, Kevin
double negative metamaterial
Abstract:Metamaterials, materials that exhibit electromagnetic properties that are not naturally achievable, are currently a hot topic in research. Of the domain of metamaterials, major research efforts have focused on double negative metamaterials (DNM), materials that demonstrate a negative index of refraction, due to their potential applications such as superlens and cloaking. Moreover, passive metamaterials--materials that do not require additional energy to exhibit exotic properties--have demonstrated qualities beneficial as a DNM. Due to the nature of DNM, the atypical electromagnetic properties can only be seen over a finite range of frequencies. Current experimental realizations of DNM have been demonstrated in infrared wavelengths and radio frequency to millimeter waves; there have been no DNMs experimentally validated over the visual frequency spectrum. In this thesis, we propose a design of a DNM that displays negative refraction at the visual spectrum and validate the design experimentally. The design utilizes a layer of close-packed, precisely size-controlled, uniform nanospheres deposited on a layer of thin metallic film. We model the reflectance and transmittance of the design through the 3D finite-difference time-domain (FDTD) and 3D discontinuous Galerkin time-domain (DGTD) method. The theory behind our design and the results of the simulations and experiments will be discussed here.
Issue Date:2014-12
Date Available in IDEALS:2015-11-05

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