Abstract
We demonstrate experimentally giant spatial-dispersion-induced birefringence in metamaterials. The difference between the reflection coefficients for $(1,\overline{1},0)$- and $(0,0,1)$-polarized light reflected from the $[1,1,0]$ surface of a metamaterial reaches $78%$. The magnitude of spatial-dispersion-induced birefringence in the transparency windows of the structure reaches ${n}_{1\overline{1}0}\ensuremath{-}{n}_{001}=\ensuremath{-}0.13$, which is at least three orders of magnitude larger than the typical values reported for natural crystals. Our results elucidate the important role of spatial dispersion effects in a wide class of metamaterials.
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