Abstract
We investigated the optical transmission properties of quasi-dielectric metamaterials composed of a stack of metallic sub-wavelength slit-array slabs. First, we used simulations to predict the transmission properties, and showed that these characteristics are basically equivalent to those of triple-layered dielectrics below the diffraction-limit frequency. Next, for the experimental demonstrations, we fabricated the metallic slit arrays, and then measured the transmission spectra. By comparison of the theoretical and experimental results, we demonstrated that each slit array acts as an individual quasi-dielectric in the stacked system. Using these metamaterials, a variety of transmission characteristics can be obtained in the terahertz region.
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