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Robust wedge demonstration to optical negative index metamaterials

TitleRobust wedge demonstration to optical negative index metamaterials
Publication TypeJournal Article
Year of Publication2013
AuthorsShen, NH, Koschny, T, Kafesaki, M, Soukoulis, CM
JournalApplied Physics Letters
Date Published06
Type of ArticleArticle
ISBN Number0003-6951
Accession NumberWOS:000320962400036

A robust wedge setup is proposed to unambiguously demonstrate negative refraction for negative index metamaterials. We applied our setup to several optical metamaterials from the literature and distinctly observed the phenomena of negative refraction. This further consolidates the reported negative-index property. It is found that there generally exists a lateral shift for the outgoing beam through the wedge. We derived a simple expression for calculating this beam shift and interestingly, it provides us a strategy to quantitatively estimate the loss of the wedge material (Im[n]). Additionally, we offered a design of metamaterials, compatible with nano-imprinting-lithography, showing negative refractive index in the visible regime (around yellow-light wavelengths). The multi-layer-system retrieval was utilized to extract the effective refractive index of the metamaterial. It was also intuitively characterized through our wedge setup to demonstrate corresponding phenomena of refraction. (C) 2013 AIP Publishing LLC.

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