ABSTRACT
Metamaterials are effective media that can provide an engineered response to electromagnetic radiation that is not available from the range of naturally occurring materials. Most of the work on metamaterials has been concentrated in the microwave regime, and the majority of these metamaterials has been constructed from a combination of fine wire grids to give a dielectric response and split ring resonators (SRRs) to provide the magnetic response. For metamaterials in the microwave regime and at higher frequencies, the building blocks have been the SRR and fine wire structure, and much of the practical considerations have focused on making the small compared with a wavelength. The materials have been used to demonstrate subwavelength imaging, both as an endoscope/faceplate and as a lens. In the former case, the material is anisotropic and used on resonance, when the permeability is large, and acts to transfer the field pattern from the input face faithfully to the output face.
