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One of the striking properties of artificially structured materials is thenegative refraction, an optical feature that known natural materials do notexhibit. Here, we propose a simple design, composed of two parallel layers ofmaterials with different refraction indices $n_1=-n_2$, that constructs perfectreflection-less devices. The electromagnetic waves can tunnel from one layer tothe other, a feature that resembles a truncation of the physical space leadingto an electromagnetic warp drive. Since the refractive indices do not requireany large values, this method demonstrates for the first time the practicalfeasibility of guiding electromagnetic fields in complete absence of reflectionphenomena and without degradation of transmission efficiency at all.

Reflection-less device allows electromagnetic warp drive