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We fabricated two-dimensionally isotropic high index metamaterials composed of hexagonal/square metallic ring and demonstrated polarization-insensitive effective refractive indices in the terahertz frequency range.
We demonstrate extremely high indices of refraction from large-area, freestanding, flexible terahertz metamaterials. The highest index of refraction of 33.22 is obtained from a multilayer metamaterial at a frequency of 0.851 THz.
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