We show experimentally the use of nanosphere lithography for fabricating negative index metamaterials in the near-infrared wavelength range. We investigated a specific implementation of the widely studied double fishnet metamaterials, consisting of a gold-silica-gold layer stack perforated by a hexagonal array of round holes. Tuning of the hole diameter allows to tailor these self-assembled materials as single- or double negative metamaterials.
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Lodewijks et al. (2011) studied this question.
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