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We theoretically investigate the possibility of using a metamaterialstructure as a spacer, named as metaspacer, which can be integrated with othermaterials in microfabrication. We show that such metaspacers can provide newoptical behaviors that are not possible through conventional spacers. Inparticular, we investigate negative index metaspacers embedded in fishnetmetamaterial structures and compare them with conventional fishnet metamaterialstructures. We show that the negative index metaspacer based fishnet structureexhibits intriguing inverted optical response. We also observe that thedependence of the resonance frequency on the geometric parameters is reversed.We conclude with practicality of these metaspacers.

On Negative Index Metamaterial Spacers and Their Unusual Optical Properties