  We theoretically investigate the possibility of using a metamaterial
structure as a spacer, named as metaspacer, which can be integrated with other
materials in microfabrication. We show that such metaspacers can provide new
optical behaviors that are not possible through conventional spacers. In
particular, we investigate negative index metaspacers embedded in fishnet
metamaterial structures and compare them with conventional fishnet metamaterial
structures. We show that the negative index metaspacer based fishnet structure
exhibits intriguing inverted optical response. We also observe that the
dependence of the resonance frequency on the geometric parameters is reversed.
We conclude with practicality of these metaspacers.
