Metamaterials are patterned metallic structures which permit access to a novel electromagnetic response, negative index of refraction, impossible to achieve with naturally occurring materials. Using the Babinet principle, the complementary split ring resonator (SRR) is etched in a metallic plate to provide negative epsilon, with perpendicular direction. Here we propose a new design, etched in a metallic plate to provide negative magnetic permeability mu, with perpendicular direction. The combined electromagnetic response of this planar metamaterial, where the negative mu comes from the aperture and the negative epsilon from the remainder of the continuous metallic plate, allows achievement of a double negative index metamaterial (NIM) with only one metasurface and strong transmission. These designs can be used to fabricate NIMs at microwave and optical wavelengths and three-dimensional metamaterials.
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