Mechanisms of subdiffraction free-space imaging using a transmission-line metamaterial superlens: An experimental verification

This work presents experimental verification of free-space subdiffraction imaging using a Veselago-Pendry superlens [Sov. Phys. Usp. 10, 509 (1968); Phys. Rev. Lett. 85, 3966 (2000)] based on the negative-refractive-index transmission-line approach. The superlens is able to resolve two sources λ0∕3 apart not only at the design frequency of 2.40GHz, where the metamaterial possesses μ and ϵ equal to −μ0 and −ϵ0, respectively, but also at 2.08GHz, where the metamaterial experiences a resonance in μ.