Homogeneous magnetic metamaterials due to extreme coupling

We introduce an approach to design metamaterials that may be self-consistently described by effective material parameters. The key is the exploitation of an extreme coupling regime which arises if plasmonic particles exhibit only nm separation. This tiny separation can be achieved by atomic layer deposition techniques. In this regime, the wavelength-to-cell size ratio exceeds easily a factor of 10 at resonance. This results in effectively homogeneous magnetic metamaterials with negligible spatial dispersion. We extend our studies towards depositing these structures on curved surfaces. This allows e.g. for perfect absorbers that make an object invisible in reflection.